Cylinder Head Acura RDX I

Scheme 9

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Scheme 12

Engine Compression Inspection

Note. After this inspection, you must reset the powertrain control module (PCM). Otherwise, the PCM will continue to stop the injectors from functioning. Select PCM reset using the Honda Diagnostic System (HDS) (see HDS CLEAR COMMAND ).

Scheme 13

1. Warm up the engine to normal operating temperature (cooling fan comes on).
2. Turn the ignition switch OFF.
3. Connect the HDS to the data link connector (DLC) (see step 2 under «HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM)»(/acura/rdx/i-2006-2009/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
4. Turn the ignition switch ON (II).
5. Make sure the HDS communicates with the vehicle and the PCM. If it doesn't troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/rdx/i-2006-2009/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
6. Select PGM-FI, INSPECTION, then ALL INJECTORS OFF on the HDS.
7. Remove the four ignition coils (see «IGNITION COIL REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/ignition-system/#ignition-system) ).
8. Remove the four spark plugs.
9. Attach the compression gauge to the spark plug hole.
10. Open the throttle fully, then crank the engine with the starter motor and measure the compression. Compression Pressure: Above 930 kPa (9.5 kgf/cm 2 , 135 psi)
11. Measure the compression on the remaining cylinders. Maximum Variation: Within 200 kPa (2.0 kgf/cm 2 , 28 psi)
12. If the compression is not within specifications, check the following items, then remeasure the compression. Damaged or worn valves and seats Damaged cylinder head gasket Damaged or worn piston rings Damaged or worn piston and cylinder bore
13. Install the four spark plugs.
14. Install the four ignition coils (see «IGNITION COIL REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/ignition-system/#ignition-system) ).
15. Select the PCM reset (see «HDS CLEAR COMMAND»(/acura/rdx/i-2006-2009/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__hds-clear-command) ) to cancel the ALL INJECTORS OFF function on the HDS.

VTEC Rocker Arm Test

Special Tools Required

1. Air pressure regulator 07AAJ-PNAA101
2. VTEC air adapter 07ZAJ-PNAA101
3. VTEC air stopper 07ZAJ-PNAA200
4. Air joint adapter 07ZAJ-PNAA300

Scheme 14

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Scheme 16

1. Start the engine, and let it run for 5 minutes, then turn the ignition switch OFF.
2. Remove the cylinder head cover (see «CYLINDER HEAD COVER REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).
3. Set the No. 1 piston at top dead center (TDC) (see step 5 ).
4. Verify that the intake primary rocker arm (A) moves independently of the intake secondary rocker arm (B). If the intake primary rocker arm does not move, remove the primary and secondary rocker arms as an assembly and check that the pistons in the secondary and primary rocker arms move smoothly (see «ROCKER ARM AND SHAFT INSPECTION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ). If any rocker arm needs replacing, replace the primary and secondary rocker arms as an assembly, then retest. If the intake primary rocker arm moves freely, go to step 5 .
5. Repeat step 4 on the remaining intake primary rocker arms with each piston at TDC. When all the primary rocker arms pass the test, go to step 6 .
6. Check that the air pressure on the shop air compressor gauge indicates over 400 kPa (4 kgf/cm 2 , 57 psi).
7. Inspect the valve clearance (see «VALVE CLEARANCE ADJUSTMENT»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__valve-clearance-adjustment) ).
8. Remove the sealing bolt (A) from the relief hole, and install the VTEC air stopper (B).
9. Remove the No. 2 and No. 3 camshaft holder bolts, and install the VTEC air adapters (C) finger-tight.
10. Connect the air joint adapter (D) and air pressure regulator (E).
11. Loosen the valve on the regulator, and apply the specified air pressure. Specified Air Pressure: 290 kPa (3.0 kgf/cm 2 , 42 psi) NOTE: If the synchronizing piston does not move after applying air pressure; move the primary or secondary rocker arm up and down manually by rotating the crankshaft clockwise.
12. With the specified air pressure applied, move the intake primary rocker arm (A) for the No. 1 cylinder. The primary rocker arm and secondary rocker arm (B) should move together. If the intake secondary rocker arm does not move, remove the primary and secondary rocker arms as an assembly, and check that the pistons in the primary and secondary rocker arms move smoothly. If any rocker arm needs replacing, replace the primary and secondary rocker arms as an assembly, and test.
13. Remove the special tools.
14. Tighten the camshaft holder mounting bolts to 22 N.m (2.2 kgf.m, 16 lbf.ft).
15. Tighten the sealing bolt to 20 N.m (2.0 kgf.m, 14 lbf.ft).
16. Install the cylinder head cover (see «CYLINDER HEAD COVER INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).

Scheme 17

Scheme 18

Scheme 19

1. Remove the cam chain (see «CAM CHAIN REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__cam-chain-removal) ).
2. Loosen the rocker arm adjusting screws (see step 2 ).
3. Remove the camshaft holder (see step 3 ).
4. Remove the intake camshaft.
5. Check that the variable valve timing control (VTC) actuator is locked by turning the VTC actuator counterclockwise. If not locked, turn the VTC actuator clockwise until it stops, then recheck it. If it is still not locked, replace the VTC actuator.
6. Seal the advance holes (A) and retard holes (B) in the No. 1 camshaft journal with tape.
7. Punch a hole in the tape over one of the advance holes.
8. Apply air to the advance hole to release the lock.
9. Check that the VTC actuator moves smoothly. If the VTC actuator does not move smoothly, replace the VTC actuator.
10. Remove the tape and adhesive residue from the camshaft journal.
11. Make sure the punch marks on the VTC actuator and exhaust camshaft sprocket are facing up, then set the camshafts in the head (see step 6 ).
12. Set the camshaft holders and chain guide B in place (see step 7 ).
13. Tighten the camshaft holder bolts to the specified torque (see step 8 ).
14. Hold the camshaft and turn the VTC actuator clockwise until you hear it click. Make sure to lock the VTC actuator by turning it.
15. Install the cam chain (see «CAM CHAIN INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__cam-chain-installation) ).
16. Adjust the valve clearance (see «VALVE CLEARANCE ADJUSTMENT»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__valve-clearance-adjustment) ).

Valve Clearance Adjustment

Special Tools Required

1. Adjuster 07MAA-PR70110
2. Locknut wrench 07MAA-PR70120

Note. Adjust the valves only when the cylinder head temperature is less than 100°F (38°C).

Scheme 20

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Scheme 25

Scheme 26

1. Remove the cylinder head cover (see «CYLINDER HEAD COVER REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).
2. Set the No. 1 piston at top dead center (TDC). The punch mark (A) on the variable valve timing control (VTC) actuator and the punch mark (B) on the exhaust camshaft sprocket should be at the top. Align the TDC marks (C) on the VTC actuator and exhaust camshaft sprocket.
3. Select the correct thickness feeler gauge for the valves you're going to check. Valve Clearance Intake: 0.21 -0.25 mm (0.008-0.010 in.) Exhaust: 0.28-0.32 mm (0.011-0.013 in.)
4. Insert the feeler gauge (A) between the adjusting screw (B) and the end of the valve stem, and slide it back and forth; you should feel a slight amount of drag.
5. If you feel too much or too little drag, loosen the locknut with the locknut wrench and adjuster, and turn the adjusting screw until the drag on the feeler gauge is correct.
6. Tighten the locknut to the specified torque and recheck the clearance. Repeat the adjustment if necessary. Specified Torque Intake: 7 x 0.75 mm 20 N.m (2.0 kgf.m, 14 lbf.ft) Apply engine oil to the nut threads. Exhaust: 7 x 0.75 mm 14 N.m (1.4 kgf.m, 10 lbf.ft) Apply engine oil to the nut threads.
7. Rotate the crankshaft 180° clockwise (camshaft pulley turns 90°).
8. Check and, if necessary, adjust the valve clearance on No. 3 cylinder.
9. Rotate the crankshaft 180° clockwise (camshaft pulley turns 90°).
10. Check and, if necessary, adjust the valve clearance on No. 4 cylinder.
11. Rotate the crankshaft 180° clockwise (camshaft pulley turns 90°).
12. Check and, if necessary, adjust the valve clearance on No. 2 cylinder.
13. Install the cylinder head cover (see «CYLINDER HEAD COVER INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).

Crankshaft Pulley Removal and Installation

Special Tools Required

1. Holder handle 07JAB-001020A
2. Crankshaft pulley holder 07AAB-RJAA100
3. Socket, 19 mm 07JAA-001020A or a commercially available 19 mm socket

Scheme 27

1. Remove the front wheels.
2. Remove the splash shield (see step 25 under «ENGINE REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#engine-removal-and-installation) ).
3. Remove the drive belt (see «DRIVE BELT REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/charging-system/#charging-system__drive-belt-removalinstallation) ).
4. Hold the pulley with the holder handle (A) and holder attachment (B).
5. Remove the bolt with a 19 mm socket (C) and breaker bar, then remove the crankshaft pulley.

Scheme 28

Scheme 29

Scheme 30

1. Clean the crankshaft pulley (A), crankshaft (B), bolt (C), and washer (D). Lubricate with new engine oil as shown.
2. Install the crankshaft pulley and hold the pulley with holder handle (A) and holder attachment (B).
3. Tighten the bolt to 49 N.m (5.0 kgf.m, 36 lbf.ft) with a torque wrench and 19 mm socket (C). Do not use an impact wrench. If you are using a new pulley bolt or new crankshaft, tighten the bolt to 177 N.m (18.0 kgf.m, 130 lbf.ft) with a torque wrench and 19 mm socket, loosen the bolt and tighten it 49 N.m (5.0 kgf.m, 36 lbf.ft).
4. Tighten the pulley bolt an additional 90°.
5. Install the drive belt (see «DRIVE BELT REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/charging-system/#charging-system__drive-belt-removalinstallation) ).
6. Install the splash shield (see step 30 under «ENGINE INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#engine-removal-and-installation__engine-installation) ).
7. Install the front wheels.

Cam Chain Removal

Note. Keep the cam chain away from magnetic fields.

Scheme 31

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Scheme 34

Scheme 35

Scheme 36

Scheme 37

Scheme 38

Scheme 39

Scheme 40

1. Remove the front wheels.
2. Remove the splash shield (see step 25 under «ENGINE REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#engine-removal-and-installation) ).
3. Remove the drive belt (see «DRIVE BELT REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/charging-system/#charging-system__drive-belt-removalinstallation) ).
4. Remove the cylinder head cover (see «CYLINDER HEAD COVER REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).
5. Set the No. 1 piston at top dead center (TDC). The punch mark (A) on the variable valve timing control (VTC) actuator and the punch mark (B) on the exhaust camshaft sprocket should be at the top. Align the TDC marks (C) on the VTC actuator and exhaust camshaft sprocket.
6. Remove the VTC oil control solenoid valve (see «VTC OIL CONTROL SOLENOID VALVE REMOVAL/TEST/INSTALLATION»(/acura/rdx/i-2006-2009/remont/testing-diagnostics/#variable-valve-timing-and-lift-electronic-control-vtec-with-vtc) ).
7. Remove the crankshaft pulley (see «CRANKSHAFT PULLEY REMOVAL AND INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__crankshaft-pulley-removal-and-installation) ).
8. Support the engine with a jack and wood block under the oil pan.
9. Remove the torque rod stiffener (A) and upper torque rod (B).
10. Remove the ground cable (A), then remove the side engine mount bracket (B).
11. Remove the water bypass pipe mounting bolt (A), then remove the side engine mount bracket (B).
12. Remove the cam chain case.
13. Loosely install the crankshaft pulley.
14. Turn the crankshaft counterclockwise to compress the auto-tensioner.
15. Align the holes on the lock (A) and the auto-tensioner (B), then insert a 1.5 mm (0.06 in.) diameter pin or lock pin (P/N 14511-PNA-003) (C) into the holes. Turn the crankshaft clockwise to secure the pin.
16. Remove the auto-tensioner.
17. Remove the cam chain guide B.
18. Remove the cam chain guide A and tensioner arm (B).
19. Remove the cam chain.

Cam Chain Installation

Note. Keep the cam chain away from magnetic fields. Before this procedure, check that the variable valve timing control (VTC) actuator is locked by turning the VTC actuator counterclockwise. If not locked, turn the VTC actuator clockwise until it stops, then recheck it. If it is still not locked, replace the VTC actuator.

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Scheme 62

1. Set the crankshaft to top dead center (TDC). Align the TDC mark (A) on the crankshaft sprocket with the pointer (B) on the engine block.
2. Set the camshafts to TDC. The punch mark (A) on the variable valve timing control (VTC) actuator and the punch mark (B) on the exhaust camshaft sprocket should be at the top. Align the TDC marks (C) on the VTC actuator and exhaust camshaft sprocket.
3. To hold the intake camshaft, insert a camshaft lock pin set (A) into the maintenance hole in the camshaft position (CMP) pulse plate A (B) and through the No. 5 rocker shaft holder (C).
4. To hold the exhaust camshaft, insert a camshaft lock pin set (A) into the maintenance hole in the camshaft position (CMP) pulse plate B (D) and through the No. 5 rocker shaft holder (C).
5. Install the cam chain on the crankshaft sprocket with the center of the two colored link plates (A) aligned with the mark (B) on the crankshaft sprocket.
6. Install the cam chain on the VTC actuator and the exhaust camshaft sprocket with the punch marks (A) aligned with the center of the three colored link plates (B).
7. Install the cam chain guide A and tensioner arm (B).
8. Compress the auto-tensioner when replacing the cam chain. Remove the pin from the auto-tensioner. Turn the plate (A) counterclockwise, to release the lock, then press the rod (B), and set the first cam (C) to the edge of the rack (D). Insert the 1.2 mm (0.05 in.) diameter pin or lock pin (P/N 14511-PNA-003) (E) into the holes.
9. Install the auto-tensioner.
10. Install the cam chain guide B.
11. Remove the pin or lock pin (P/N 14511-PNA-003) from the auto-tensioner.
12. Remove the camshaft lock pin set.
13. Check the chain case oil seal for damage. If the oil seal is damaged, replace the chain case oil-seal (see «CHAIN CASE OIL SEAL INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__chain-case-oil-seal-installation) ).
14. Remove all of the old liquid gasket from the chain case mating surfaces, bolts, and bolt holes.
15. Clean and dry the chain case mating surfaces.
16. Apply liquid gasket, P/N 08717-0004,08718-0001, 08718-0003, or 08718-0009, evenly to the engine block mating surface of the chain case. Install the component within 5 minutes of applying the liquid gasket. NOTE: Apply liquid gasket about 3 mm (0.12 in.) diametrer bead along the broken line (A). If you apply liquid gasket P/N 08718-0012, the component must be installed within 4 minutes. If too much time has passed after applying the liquid gasket, remove the old liquid gasket and residue, then reapply new liquid gasket.
17. Apply liquid gasket to the engine block upper surface contact areas (B) on the chain case and lower block upper surface contact areas (C) on the chain case. NOTE: Apply about 11 mm (0.43 in.) diameter and about 3 mm (0.12 in.) thickness of liquid gasket to areas (B) and (C).
18. Apply liquid gasket, P/N 08717-0004,08718-0001, 08718-0003, or 08718-0009, evenly to the oil pan mating surface of the chain case. Install the component within 5 minutes of applying the liquid gasket. NOTE: Apply liquid gasket about 3 mm (0.12 in.) diametrer bead along the broken line (A). If you apply liquid gasket P/N 08718-0012, the component must be installed within 4 minutes. If too much time has passed after applying the liquid gasket, remove the old liquid gasket and residue, then reapply new liquid gasket.
19. Install the new O-ring (A) on the chain case. Set the edge of the chain case (B) to the edge of the oil pan (C), then install the chain case on the engine block (D). Wipe off the excess liquid gasket on the oil pan and chain case mating area. NOTE: When installing the chain case, do not slide the bottom surface onto the oil pan mounting surface. Wait at least 30 minutes to allow liquid gasket to cure before filling the engine with oil. Do not run the engine for at least 3 hours after installing the chain case.
20. Install the side engine mount bracket (A), then install the water bypass pipe mounting bolt (B).
21. Install the side engine mount bracket (A), then loosely tighten the new bolt and nut (B), and loosely tighten the bolt (C).
22. Install the ground cable (D).
23. Remove the air cleaner housing assembly (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#intake-air-system) ).
24. Loosen the transmission mounting bolt and nuts (A).
25. Raise the lift to full height.
26. Loosen the lower torque rod mounting bolt (A).
27. Lower the vehicle on the lift.
28. Tighten the side engine mount mounting bolts and nut.
29. Tighten the transmission mounting bolt and nuts.
30. Raise the lift to full height.
31. Tighten the lower torque rod mounting bolt.
32. Lower the vehicle on the lift.
33. Install the air cleaner housing assembly (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#intake-air-system) ).
34. Install the upper torque rod (A) and torque rod stiffener (B), and tighten the new stiffener mounting bolts (C), then tighten the new upper torque rod mounting bolts in the numbered sequence shown.
35. Install the crankshaft pulley (see «INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).
36. Install the variable valve timing control (VTC) oil control solenoid valve (see «VTC OIL CONTROL SOLENOID VALVE REMOVAL/TEST/INSTALLATION»(/acura/rdx/i-2006-2009/remont/testing-diagnostics/#variable-valve-timing-and-lift-electronic-control-vtec-with-vtc) ).
37. Install the cylinder head cover (see «CYLINDER HEAD COVER INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).
38. Install the drive belt (see «DRIVE BELT REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/charging-system/#charging-system__drive-belt-removalinstallation) ).
39. Do the CKP pattern clear/CKP learn procedure (see «HDS CLEAR COMMAND»(/acura/rdx/i-2006-2009/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__hds-clear-command) ).

Scheme 63

Scheme 64

Scheme 65

1. Remove the chain case cover.
2. Turn the crankshaft counterclockwise to compress the auto-tensioner.
3. Align the holes on the lock (A) and the auto-tensioner (B), then insert a 1.5 mm (0.06 in.) diameter pin or lock pin (P/N 14511-PNA-003) (C) into the holes. Turn the crankshaft clockwise to secure the pin.
4. Remove the auto-tensioner.

Scheme 66

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Scheme 69

1. Install the auto-tensioner.
2. Remove the pin or lock pin (P/N 14511-PNA-003) from the auto-tensioner.
3. Remove all of the old liquid gasket from the chain case cover mating surfaces, bolts, and bolt holes.
4. Clean and dry the chain case cover mating surfaces.
5. Apply liquid gasket, P/N 08717-0004, 08718-0001, 08718-0003, or 08718-0009, evenly to the chain case mating surface of the chain case cover. Install the component within 5 minutes of applying the liquid gasket. NOTE: If you apply liquid gasket P/N 08718-0012, the component must be installed within 4 minutes. If too much time has passed after applying the liquid gasket, remove the old liquid gasket and residue, then reapply new liquid gasket.
6. Install the chain case cover.

Note. Wait at least 30 minutes to allow liquid gasket to cure before filling the engine with oil. Do not run the engine for at least 3 hours after installing the chain case cover.

Scheme 70

Chain Case Oil Seal Installation

Special Tools Required

1. Handle driver 07749-0010000
2. Attachment, 52 x 55 mm 07746-0010400

Scheme 71

1. Use the driver and attachment to drive a new oil seal squarely into the chain case to the specified installed height.
2. Measure the distance between the chain case surface and oil seal. Oil Seal Installed Height: 33.0-33.7 mm (1.30-1.33 in.)

Scheme 72

Cam Chain Inspection

Special Tools Required

Cam chain inspection gauge 07AAJ-RWCA100

Scheme 73

Scheme 74

Scheme 75

1. Remove the front wheels.
2. Remove the splash shield (see step 25 under «ENGINE REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#engine-removal-and-installation) ).
3. Remove the four spark plugs.
4. Remove the cylinder head cover (see «CYLINDER HEAD COVER REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).
5. Rotate the crankshaft pulley two turns clockwise.
6. Set the No. 1 piston at top dead center (TDC). The punch mark (A) on the variable valve timing control (VTC) actuator and the punch mark (B) on the exhaust camshaft sprocket should be at the top. Align the TDC marks (C) on the VTC actuator and exhaust camshaft sprocket.
7. Measure the clearance between the cam chain and the tensioner arm with the cam chain inspection gauge. If the clearance is OK, Go to step 22 . If the clearance is more than the service limit, Go to step 8 . Chain-to-Arm Clearance Service Limit: MIL on with P0341:4.3 mm (0.17 in.) Without MIL: 5.5 mm (0.22 in.)
8. Remove the cam chain (see «CAM CHAIN REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__cam-chain-removal) ), and check the teeth on the crankshaft sprocket, VTC actuator, and exhaust camshaft sprocket for wear and damage. If any of them are worn or damaged, replace if necessary.
9. Check the oil passage on the auto-tensioner for clogs. If the auto-tensioner is clogged, replace it.
10. Remove the power steering (P/S) pump. Do not disconnect the P/S hoses from the pump (see step 21 under «ENGINE REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#engine-removal-and-installation) ).
11. Attach the universal eyelet to the drive belt auto-tensioner (see step 54 under «ENGINE REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#engine-removal-and-installation) ).
12. Remove the top corner clip from the front grill on both sides. Place the engine support mount pads over the hood edge cushions, and align the pins with the clip hole. Remove the lids from both sides of the cowl cover. Install the engine support hanger (AAR-T-12566), then attach the hook to the universal eyelet. Tighten the wing nut by hand to lift and support the engine/transmission assembly (see step 5 under «OIL PUMP CHAIN REPLACEMENT»(/acura/rdx/i-2006-2009/remont/lubrication-system/#engine-lubrication__oil-pump-chain-replacement) ).
13. Remove the oil pan (see «OIL PAN REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#engine-block__oil-pan-removal) ).
14. Measure the oil pump chain auto-tensioner rod length. Oil Pump Chain Auto-Tensioner Rod Length Service Limit: 13 mm (0.5 in.)
15. If the length is over the service limit, replace the oil pump chain (see «OIL PUMP CHAIN REPLACEMENT»(/acura/rdx/i-2006-2009/remont/lubrication-system/#engine-lubrication__oil-pump-chain-replacement) ). When replacing, check the teeth on the crankshaft sprocket and oil pump sprocket for wear and damage. If any of them are worn or damaged, replace if necessary.
16. Check the oil passage on the oil pump chain auto-tensioner for clogs. If the auto-tensioner is clogged, replace it.
17. Install the oil pan (see «OIL PAN INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#engine-block) ).
18. Support the engine with a jack and a wood block under the oil pan.
19. Remove the special tools from the engine and vehicle.
20. Install the new cam chain (see «CAM CHAIN INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__cam-chain-installation) ).
21. Install the P/S pump (see step 38 under «ENGINE INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#engine-removal-and-installation__engine-installation) ).
22. Install the cylinder head cover (see «CYLINDER HEAD COVER INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).
23. Install the four spark plugs.
24. Install the splash shield (see step 30 under «ENGINE INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#engine-removal-and-installation__engine-installation) ).
25. Install the front wheels.

Scheme 76

1. Remove the front wheels.
2. Remove the splash shield (see step 25 under «ENGINE REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#engine-removal-and-installation) ).
3. Remove the drive belt (see «DRIVE BELT REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/charging-system/#charging-system__drive-belt-removalinstallation) ).
4. Remove the cylinder head cover (see «CYLINDER HEAD COVER REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).
5. Set the No. 1 piston at top dead center (TDC). The punch mark on the variable valve timing control (VTC) actuator and the punch mark on the exhaust camshaft sprocket should be at the top. Align the TDC marks on the VTC actuator and exhaust camshaft sprocket (see step 5 ).
6. Remove the VTC oil control solenoid valve (see «VTC OIL CONTROL SOLENOID VALVE REMOVAL/TEST/INSTALLATION»(/acura/rdx/i-2006-2009/remont/testing-diagnostics/#variable-valve-timing-and-lift-electronic-control-vtec-with-vtc) ).
7. Remove the crankshaft pulley (see «CRANKSHAFT PULLEY REMOVAL AND INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__crankshaft-pulley-removal-and-installation) ).
8. Support the engine with a jack and wood block under the oil pan.
9. Remove the torque rod stiffener and upper torque rod (see step 9 ).
10. Remove the ground cable, then remove the side engine mount bracket (see step 10 ).
11. Remove the side engine mount bracket (see step 11 ).
12. Remove the cam chain case (see step 12 ).
13. Remove the CKP pulse plate.
14. Install the CKP pulse plate.
15. Check the chain case oil seal for damage. If the oil seal is damaged, replace the chain case oil seal (see «CHAIN CASE OIL SEAL INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__chain-case-oil-seal-installation) ).
16. Remove all of the old liquid gasket from the chain case mating surfaces, bolt, and bolt holes.
17. Clean and dry the chain case mating surfaces.
18. Apply liquid gasket, P/N 08717-0004,08718-0001, 08718-0003, or 08718-0009, evenly to the engine block mating surface of the chain case. Install the component within 5 minutes of applying the liquid gasket (see step 16 ). NOTE: If you apply liquid gasket P/N 08718-0012, the component must be installed within 4 minutes. If too much time has passed after applying the liquid gasket, remove the old liquid gasket and residue, then reapply new liquid gasket.
19. Apply liquid gasket to the engine block upper surface contact areas on the chain case and lower block upper surface contact areas on the chain case (see step 17 ).
20. Apply liquid gasket, P/N 08717-0004,08718-0001, 08718-0003, or 08718-0009, evenly to the oil pan mating surface of the chain case. Install the component within 5 minutes of applying the liquid gasket (see step 18 ). NOTE: If you apply liquid gasket P/N 08718-0012, the component must be installed within 4 minutes. If too much time has passed after applying the liquid gasket, remove the old liquid gasket and residue, then reapply new liquid gasket.
21. Install the new O-ring on the chain case. Set the edge of the chain case to the edge of the oil pan, then install the chain case on the engine block (see step 19 ). Wipe off the excess liquid gasket on the oil pan and chain case mating area. NOTE: When installing the chain case, do not slide the bottom surface onto the oil pan mounting surface. Wait at least 30 minutes to allow liquid gasket to cure before filling the engine with oil. Do not run the engine for at least 3 hours after installing the chain case.
22. Install the side engine mount bracket (see step 20 ).
23. Install the side engine mount bracket, then loosely tighten the new bolt and nut, and loosely tighten the bolt. Install the ground cable (see step 21 ).
24. Remove the air cleaner housing assembly (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#intake-air-system) ).
25. Loosen the transmission mounting bolt and nuts (see step 24 ).
26. Raise the lift to full height.
27. Loosen the lower torque rod mounting bolt (see step 26 ).
28. Lower the vehicle on the lift.
29. Tighten the side engine mount mounting bolts and nut (see step 28 ).
30. Tighten the transmission mounting bolt and nuts (see step 29 ).
31. Raise the lift to full height.
32. Tighten the lower torque rod mounting bolt (see step 31 ).
33. Lower the vehicle on the lift.
34. Install the air cleaner housing assembly (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#intake-air-system) ).
35. Install the upper torque rod and torque rod stiffener, and tighten the new stiffener mounting bolts, then tighten the new upper torque rod mounting bolts in the numbered sequence shown (see step 34 ).
36. Install the variable valve timing control (VTC) oil control solenoid valve (see «VTC OIL CONTROL SOLENOID VALVE REMOVAL/TEST/INSTALLATION»(/acura/rdx/i-2006-2009/remont/testing-diagnostics/#variable-valve-timing-and-lift-electronic-control-vtec-with-vtc) ).
37. Install the crankshaft pulley (see «INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).
38. Install the cylinder head cover (see «CYLINDER HEAD COVER INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).
39. Install the drive belt (see «DRIVE BELT REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/charging-system/#charging-system__drive-belt-removalinstallation) ).
40. Do the CKP pattern clear/CKP learn procedure (see «HDS CLEAR COMMAND»(/acura/rdx/i-2006-2009/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__hds-clear-command) ).

Scheme 77

Scheme 78

Scheme 79

Scheme 80

1. Remove the charge air cooler (see «REMOVAL»(/acura/rdx/i-2006-2009/remont/exhaust/#intake-manifold-and-exhaust-system) ).
2. Remove the fuel injector cover.
3. Remove the four ignition coils (see «IGNITION COIL REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/ignition-system/#ignition-system) ).
4. Remove the power steering hose bracket (A), breather hose (B), and dipstick (C).
5. Remove the bracket mounting bolts (D) from the cylinder head cover.
6. Disconnect the rocker arm oil control solenoid connector (A), rocker arm oil pressure switch connector (B), and variable valve timing control (VTC) oil control solenoid valve connector (C), then remove the harness clamp (D).
7. Disconnect the air fuel ratio (A/F) sensor connector (A), oil pressure switch connector (B), and crankshaft position (CKP) sensor connector (C), then remove the harness clamps (D).
8. Remove the cylinder head cover.

Scheme 81

Scheme 82

Scheme 83

Scheme 84

Scheme 85

Scheme 86

Scheme 87

Scheme 88

Scheme 89

1. Thoroughly clean the head cover gasket and the groove. Inspect the gasket for signs of damage. Replace if necessary.
2. Install a new head cover gasket (A) in the groove of the cylinder head cover (B).
3. Check that the mating surfaces are clean and dry.
4. Apply liquid gasket, P/N 08717-0004,08718-0001, 08718-0003, or 08718-0009, on the chain case and the No. 5 rocker shaft holder mating areas. Install the component within 5 minutes of applying the liquid gasket. NOTE: If you apply liquid gasket P/N 08718-0012, the component must be installed within 4 minutes. If too much time has passed after applying the liquid gasket, remove the old liquid gasket and residue, then reapply new liquid gasket.
5. Set the spark plug seals (A) on the spark plug tubes. Place the cylinder head cover (B) on the cylinder head, then slide the cover slightly back and forth to seat the head cover gasket.
6. Inspect the cover washers (C). Replace any washer that is damaged or deteriorated.
7. Tighten the bolts in three steps. In the final step tighten all bolts, in sequence, to 12 N.m (1.2 kgf.m, 8.8 lbf.ft). NOTE: Wait at least 30 minutes to allow liquid gasket to cure before filling the engine with oil. Do not run the engine for at least 3 hours after installing the head cover.
8. Connect the air fuel ratio (A/F) sensor connector (A), oil pressure switch connector (B), and crankshaft position (CKP) sensor connector (C), then install the harness clamps (D).
9. Connect the rocker arm oil control solenoid connector (A), rocker arm oil pressure switch connector (B), and variable valve timing control (VTC) oil control solenoid valve connector (C), then install the harness clamp (D).
10. Install the power steering hose bracket (A), breather hose (B), and dipstick (C).
11. Install the bracket mounting bolts (D) to the cylinder head cover.
12. Install the four ignition coils (see «IGNITION COIL REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/ignition-system/#ignition-system) ).
13. Install the fuel injector cover.
14. Install the charge air cooler (see «INSTALLATION»(/acura/rdx/i-2006-2009/remont/exhaust/#intake-manifold-and-exhaust-system) ).

Note. Use fender covers to avoid damaging painted surfaces. To avoid damage, unplug the wiring connectors carefully while holding the connector portion. To avoid damaging the cylinder head, wait until the engine coolant temperature drops below 100°F (38°C) before loosening the cylinder head bolts. Mark all wiring and hoses to avoid misconnection. Also, be sure that they do not contact other wiring or hoses, or interfere with other parts.

Scheme 90

Scheme 91

Scheme 92

Scheme 93

Scheme 94

1. Relieve fuel pressure (see «FUEL PRESSURE RELIEVING»(/acura/rdx/i-2006-2009/remont/fuel-system/#fuel-supply-system__fuel-pressure-relieving) ).
2. Drain the engine coolant (see «COOLANT CHECK»(/acura/rdx/i-2006-2009/remont/cooling-system-mechanical/#cooling-system) ).
3. Remove the air cleaner housing assembly (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#intake-air-system) ).
4. Remove the drive belt (see «DRIVE BELT REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/charging-system/#charging-system__drive-belt-removalinstallation) ).
5. Remove the intake manifold (see «REMOVAL»(/acura/rdx/i-2006-2009/remont/exhaust/#intake-manifold-and-exhaust-system) ).
6. Remove the exhaust manifold (see «REMOVAL»(/acura/rdx/i-2006-2009/remont/exhaust/#intake-manifold-and-exhaust-system) ).
7. Remove the engine wire harness connectors and wire harness clamps from the cylinder head. Engine coolant temperature (ECT) sensor 1 connector Camshaft position (CMP) sensor A (Intake) connector Camshaft position (CMP) sensor B (Exhaust) connector EVAP canister purge valve connector Cylinder Head Removal (cont'd)
8. Remove the quick-connect fitting cover (A), then disconnect the fuel feed hose (B) (see «FUEL LINE/QUICK-CONNECT FITTING REMOVAL»(/acura/rdx/i-2006-2009/remont/fuel-system/#fuel-supply-system__fuel-linequick-connect-fitting-removal) ).
9. Disconnect the evaporative emission (EVAP) canister hose (A), brake booster vacuum hose (B), and vacuum hose (C).
10. Remove the two bolts (A) securing the EVAP canister purge control valve mounting bracket, then remove the harness clamps (B).
11. Disconnect the upper radiator hose (A), heater hose (B), and water bypass hose (C).
12. Remove the cam chain (see «CAM CHAIN REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__cam-chain-removal) ).
13. Remove the rocker arm assembly (see «ROCKER ARM ASSEMBLY REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).
14. Remove the cylinder head bolts. To prevent warpage, loosen the bolts in sequence 1/3 turn at a time; repeat the sequence until all bolts are loosened.
15. Remove the cylinder head.

Scheme 95

Scheme 96

1. Remove the cylinder head cover (see «CYLINDER HEAD COVER REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).
2. Remove the camshaft position (CMP) sensor A (see «CMP SENSOR A REPLACEMENT»(/acura/rdx/i-2006-2009/remont/testing-diagnostics/#variable-valve-timing-and-lift-electronic-control-vtec-with-vtc) ).
3. Hold the camshaft with an open-end wrench, then loosen the bolt.
4. Remove the camshaft position (CMP) pulse plate A.
5. Install the CMP pulse plate A in the reverse order of removal.

Scheme 97

Scheme 98

1. Remove the cylinder head cover (see «CYLINDER HEAD COVER REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).
2. Remove the camshaft position (CMP) sensor B (see «CMP SENSOR B REPLACEMENT»(/acura/rdx/i-2006-2009/remont/testing-diagnostics/#pgm-fi-system) ).
3. Hold the camshaft with an open-end wrench, then loosen the bolt.
4. Remove the camshaft position (CMP) pulse plate B.
5. Install the CMP pulse plate B in the reverse order of removal.

Scheme 99

1. Remove the cam chain (see «CAM CHAIN REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__cam-chain-removal) ).
2. Hold the camshaft with an open-end wrench, then loosen the variable valve timing control (VTC) actuator mounting bolt and exhaust camshaft sprocket mounting bolt.
3. If the VTC actuator is reused, do the following steps. Remove the intake camshaft, and seal the advance holes and retard holes in the No. 1 camshaft journal with tape (see step 6 ). Punch a hole in the tape over one of the advance holes (see step 7 ). Apply air to the advance hole to release the lock (see step 8 ). Remove the tape and adhesive residue from the camshaft journal.
4. Remove the VTC actuator and exhaust camshaft sprocket.

Scheme 100

1. Install the VTC actuator and exhaust camshaft sprocket. NOTE: Install the VTC actuator to unlock position.
2. Apply engine oil to the threads of the VTC actuator mounting bolt and exhaust camshaft mounting bolt, then install them.
3. Hold the camshaft with an open-end wrench, then tighten the bolts. Specified Torque VTC Actuator Mounting Bolt: 12 x 1.25 mm 113 N.m (11.5 kgf.m, 83 lbf.ft) Exhaust Camshaft Sprocket Mounting Bolt: 10 x 1.25 mm 72 N.m (7.3 kgf.m, 53 lbf.ft)
4. Hold the camshaft, and turn the VTC actuator clockwise until you hear it click. Make sure to lock the VTC actuator by turning it.
5. Install the cam chain (see «CAM CHAIN INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__cam-chain-installation) ).

1. Remove the cylinder head (see «CYLINDER HEAD COVER REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).
2. Inspect the camshaft (see «CAMSHAFT INSPECTION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__camshaft-inspection) ).
3. Check the cylinder head for warpage. Measure along the edges, and across the center. If warpage is less than 0.05 mm (0.002 in.), cylinder head resurfacing is not required. If warpage is between 0.05 mm (0.002 in.) and 0.2 mm (0.008 in.), resurface the cylinder head. Maximum resurface limit is 0.2 mm (0.008 in.) based on a height of 104 mm (4.09 in.). Cylinder Head Height Standard (New): 103.95-104.05 mm (4.093-4.096 in.)

Scheme 101

Scheme 102

Scheme 103

1. Remove the cam chain (see «CAM CHAIN REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__cam-chain-removal) ).
2. Loosen the rocker arm adjusting screws (A).
3. Remove the camshaft holder bolts. To prevent damaging the camshafts, loosen the bolts, in sequence, two turns at a time. NOTE: Bolt 1 is not on all engines.
4. Remove the cam chain guide B, camshaft holders, and camshafts.
5. Insert the bolts (A) into the rocker shaft holder, then remove the rocker arm assembly (B).

Scheme 104

Rocker Arm and Shaft Disassembly/Reassembly

Note. Identify each part as it is removed so that each item can be reinstalled. Inspect the rocker arm shaft and rocker arms (see ROCKER ARM AND SHAFT INSPECTION ). If reused, the rocker arms must be installed in their original location. When removing, or installing the rocker arm assembly, do not remove the camshaft holder bolts. The bolts will keep the holders and rocker arms on the shaft. Prior to reassembling, clean all the parts in solvent, dry them, and apply lubricant to any contact points. Bundle the rocker arms with rubber bands to keep them together as a set. When replacing the intake rocker arm assembly, remove the fastening hardware from the new intake rocker arm assembly.

Scheme 105

Scheme 106

Scheme 107

Scheme 108

Scheme 109

1. Remove the rocker arm assembly (see «ROCKER ARM ASSEMBLY REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).
2. Disassemble the rocker arm assembly (see «ROCKER ARM AND SHAFT DISASSEMBLY/REASSEMBLY»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__rocker-arm-and-shaft-disassemblyreassembly) ).
3. Measure the diameter of the shaft at the first rocker location.
4. Zero the gauge (A) to the shaft diameter.
5. Measure the inside diameter of the rocker arm, and check it for an out-of-round condition. Rocker Arm-to-Shaft Clearance Standard (New): Intake: 0.025-0.052 mm (0.0010-0.0020 in.) Exhaust: 0.018-0.056 mm (0.0007-0.0022 in.) Service Limit: 0.08 mm (0.003 in.)
6. Repeat for all rocker arms and both shafts. If the clearance is beyond the service limit, replace the rocker shaft and all out of service limit rocker arms. If any VTEC rocker arm needs replacement, replace the rocker arms (primary and secondary), as a set.
7. Inspect the rocker arm pistons (A). Push on each piston manually. If it does not move smoothly, replace the rocker arm set. NOTE: Apply oil to the pistons when reassembling.
8. Install the rocker arm assembly (see «ROCKER ARM ASSEMBLY INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).

Camshaft Inspection

Note. Do not rotate the camshaft during inspection.

Scheme 110

Scheme 111

Scheme 112

Scheme 113

1. Remove the rocker arm assembly (see «ROCKER ARM ASSEMBLY REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).
2. Put the rocker shaft holders, camshaft, and camshaft holders on the cylinder head, then tighten the bolts, in sequence, to the specified torque. NOTE: If the engine does not have bolt (21)(Scheme 110), skip it and continue the torque sequence. Specified Torque 8 x 1.25 mm 22 N.m (2.2 kgf.m, 16 lbf.ft) 6 x 1.0 mm 12 N.m (1.2 kgf.m, 8.8 lbf.ft) 6 x 1.0 mm Bolts: (21), (22), (23)
3. Seat the camshaft by pushing it away from the camshaft pulley end of the cylinder head.
4. Zero the dial indicator against the end of the camshaft, then push the camshaft back and forth, and read the end play. If the end play is beyond the service limit, replace the cylinder head and recheck. If it is still beyond the service limit, replace the camshaft. Camshaft End Play Standard (New): 0.05-0.20 mm (0.002-0.008 in.) Service Limit: 0.4 mm (0.02 in.)
5. Unscrew the camshaft holder bolts two turns at a time, in a crisscross pattern. Then remove the camshaft holders from the Cylinder head.
6. Lift the camshafts out of the cylinder head, wipe them clean, then inspect the lift ramps. Replace the camshaft if any lobes are pitted, scored, or excessively worn.
7. Clean the camshaft journal surfaces in the cylinder head, then set the camshafts back in place. Place a plastigage strip across each journal.
8. Install the camshaft holders, then tighten the bolts to the specified torque as shown in step 2.
9. Remove the camshaft holders. Measure the widest portion of plastigage on each journal. If the camshaft-to-holder clearance is within: limits, go to step 11. If the camshaft-to-holder clearance is beyond the service limit, and the camshaft has been replaced, replace the cylinder head. If the camshaft-to-holder clearance is beyond the service limit, and the camshaft has not been replaced, go to step 10. Camshaft-to-Holder Oil Clearance Standard (New): No. 1 Journal: 0.030-0.069 mm (0.001-0.003 in.) No. 2, 3, 4, 5 Journals: 0.060-0.099 mm (0.002-0.004 in.) Service Limit: 0.15 mm (0.006 in.)
10. Check the total runout with the camshaft supported on V-blocks. If the total runout of the camshaft is within the service limit, replace the cylinder head. If the total runout is beyond the service limit, replace the camshaft, and recheck the camshaft-to-holder oil clearance. If the oil clearance is still beyond the service limit, replace the cylinder head. Camshaft Total Runout Standard (New): 0.03 mm (0.001 in.) max. Service Limit: 0.04 mm (0.002 in.)
11. Measure cam lobe height.

Cam Lobe Height Standard (New)

CAM LOBE HEIGHT SPECIFICATION

PRI: Primary SEC: Secondary C/C: Cam Chain INTAKE

Scheme 114

Valve, Spring, and Valve Seal Removal

Special Tools Required

Valve spring compressor attachment 07757-PJ1010A

Identify the valves and valve springs as they are removed so that each item can be reinstalled in its original position.

Scheme 115

Scheme 116

Scheme 117

Scheme 118

1. Remove the cylinder head (see «CYLINDER HEAD REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).
2. Using an appropriate-sized socket (A) and plastic mallet (B), lightly tap the valve retainer to loosen the valve cotters.
3. Install the valve spring compressor. Compress the spring, and remove the valve cotters.
4. Remove the special tool, then remove the valve retainer and valve spring.
5. Install the valve guide seal remover.
6. Remove the valve seal.

Valve Inspection

1. Remove the valves (see «VALVE, SPRING, AND VALVE SEAL REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__valve-spring-and-valve-seal-removal) ).
2. Measure the valve in these areas. Intake Valve Dimensions A Standard (New): 34.85-35.15 mm (1.372-1.384 in.) B Standard (New): 108.7-109.5 mm (4.280-4.311 in.) C Standard (New): 5.475-5.485 mm (0.2156-0.2159 in.) C Service Limit: 5.445 mm (0.214 in.) Exhaust Valve Dimensions A Standard (New): 29.85-30.15 mm (1.175-1.187 in.) B Standard (New): 108.4-109.0 mm (4.268-4.291 in.) C Standard (New): 5.450-5.460 mm (0.2146-0.2150 in.) C Service Limit: 5.42 mm (0.213 in.)

Scheme 119

Valve Stem-to-Guide Clearance Inspection

1. Remove the valves (see «VALVE, SPRING, AND VALVE SEAL REMOVAL»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__valve-spring-and-valve-seal-removal) ).
2. Subtract the O.D. of the valve stem, measured with a micrometer, from the I.D. of the valve guide, measured with an inside micrometer or ball gauge. Take the measurements in three places along the valve stem and three places inside the valve guide. The difference between the largest guide measurement and the smallest stem measurement should not exceed the service limit. Intake Valve Stem-to-Guide Clearance Standard (New): 0.030-0.055 mm (0.0012-0.0022 in.) Service Limit: 0.08 mm (0.003 in.) Exhaust Valve Stem-to-Guide Clearance Standard (New): 0.055-0.080 mm (0.0022-0.0031 in.) Service Limit: 0.11 mm (0.004 in.)

Valve Guide Replacement

Special Tools Required

Scheme 120

Scheme 121

Scheme 122

Scheme 123

Scheme 124

1. Valve guide driver, 5.5 mm 07742-0010100
2. Valve guide reamer, 5.5 mm 07HAH-PJ7A100 Inspect the valve stem-to-guide clearance (see «VALVE INSPECTION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__valve-inspection) ). As illustrated, use a commercially available air-impact valve guide driver (A) modified to fit the diameter of the valve guides. In most cases, the same procedure can be done using the special tool and a conventional hammer. Select the proper replacement guides, and chill them in the freezer section of a refrigerator for about an hour. Use a hot plate or oven to evenly heat the cylinder head to 300°F (150°C). Monitor the temperature with a cooking thermometer. Do not get the head hotter than 300°F (150°C); excessive heat may loosen the valve seats. Working from the camshaft side, use the driver and an air hammer to drive the guide about 2 mm (0.1 in.) towards the combustion chamber. This will knock off some of the carbon and make removal easier. Hold the air hammer directly in line with the valve guide to prevent damaging the driver. Turn the head over, and drive the guide out toward the camshaft side of the head. If a valve guide won't move, drill it out with a 8 mm (5/16 in.) bit, then try again. Drill guides only in extreme cases; you could damage the cylinder head if the guide breaks. Take out the new guide(s) from the freezer, one at a time, as you need them. Apply a thin coat of clean engine oil to the outside of the new valve guide. Install the guide from the camshaft side of the head; use the 5.5 mm valve guide driver to drive the guide in to the specified installed height (A) of the guide (B). If you have all 16 guides to do, you may have to reheat the head. Valve Guide Installed Height Intake: 15.2-16.2 mm (0.598-0.638 in.) Exhaust: 15.5-16.5 mm (0.610-0.650 in.) Coat both reamer and the valve guide with cutting oil. Rotate the reamer clockwise to the full length of the valve guide bore. Continue to rotate the reamer clockwise while removing it from the bore. Thoroughly wash the guide in detergent and water to remove any cutting residue. Check the clearances with a valve (see «VALVE INSPECTION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__valve-inspection) ). Verify that a valve slides into the intake and exhaust valve guides without sticking. Inspect the valve seating. If necessary renew the valve seat using a valve seat cutter (see «VALVE SEAT RECONDITIONING»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).

Scheme 125

Scheme 126

Scheme 127

Scheme 128

1. Inspect the valve stem-to-guide clearance (see «VALVE INSPECTION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__valve-inspection) ). If the valve guides are worn, replace them (see «VALVE GUIDE REPLACEMENT»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__valve-guide-replacement) ) before cutting the valve seats.
2. Renew the valve seats in the cylinder head using a valve seat cutter.
3. Carefully cut a 45° seat, removing only enough material to ensure a smooth and concentric seat.
4. Bevel the upper and lower edges at the angles shown in the illustration. Check the width of the seat and adjust accordingly.
5. Make one more very light pass with the 45° cutter to remove any possible burrs caused by the other cutters. Valve Seat Width Standard (New): 1.25-1.55 mm (0.049-0.061 in.) Service Limit: 2.00 mm (0.079 in.)
6. After resurfacing the seat, inspect for even valve seating. Apply Prussian Blue compound (A) to the valve face. Insert the valve in its original location in the head, then lift it and snap it closed against the seat several times.
7. The actual valve seating surface (B), as shown by the blue compound, should be centered on the seat. If it is too high (closer to the valve stem), you must make a second cut with the 67.5° cutter to move it down, then one more cut with the 45° cutter to restore seat width. If it is too low (close to the valve edge), you must make a second cut with the 35° cutter (intake side) or the 30° cutter (exhaust side) to move it up, then make one more cut with the 45° cutter to restore seat width. NOTE: The final cut should always be made with the 45° cutter.
8. Insert the intake and exhaust valves in the head, and measure valve stem installed height (A). Intake Valve Stem Installed Height Standard (New): 44.0-44.5 mm (1.73-1.75 in.) Service Limit: 44.7 mm (1.76 in.) Exhaust Valve Stem Installed Height Standard (New): 44.1-44.6 mm (1.74-1.76 in.) Service Limit: 44.8 mm (1.76 in.)
9. If valve stem installed height is beyond the service limit, replace the valve and recheck. If it is still beyond the service limit, replace the cylinder head; the valve seat in the head is too deep.

Valve, Spring, and Valve Seal Installation

Special Tools Required

1. Stem seal driver 07PAD-0010000
2. Valve spring compressor attachment 07757-PJ1010A

Scheme 129

Scheme 130

1. Coat the valve stems with engine oil. Install the valves in the valve guides.
2. Check that the valves move up and down smoothly.
3. Install the spring seats on the cylinder head.
4. Install the new valve seals (A) using the valve guide seal installer (B). NOTE: The exhaust valve seal (C) has a black spring (D), and the intake valve seal (E) has a white spring (F). They are not interchangeable.
5. Install the valve spring and valve retainer. Place the end of the valve spring with the closely wound coils toward the cylinder head.
6. Install the valve spring compressor. Compress the spring, and install the valve cotters.
7. Remove the valve spring compressor.
8. Lightly tap the end of each valve stem two or three times with a plastic mallet (A) to ensure proper seating of the valve and valve keepers. Tap the valve stem only along its axis so you do not bend the stem.

Scheme 131

Scheme 132

Scheme 133

Scheme 134

Scheme 135

1. Reassemble the rocker arm assembly (see «ROCKER ARM AND SHAFT DISASSEMBLY/REASSEMBLY»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__rocker-arm-and-shaft-disassemblyreassembly) ).
2. Clean and dry the No. 5 rocker shaft holder mating surface.
3. Apply liquid gasket, P/N 08717-0004,08718-0001, 08718-0003, or 08718-0009, evenly to the cylinder head mating surface of the No. 5 rocker shaft holder. Install the component within 5 minutes of applying the liquid gasket. NOTE: If you apply liquid gasket P/N 08718-0012, the component must be installed within 4 minutes. If too much time has passed after applying the liquid gasket, remove the old liquid gasket and residue, then reapply new liquid gasket.
4. Insert the bolts (A) into the rocker shaft holder, then install the rocker arm assembly (B) on the cylinder head.
5. Remove the bolts from the rocker shaft holder.
6. Make sure the punch marks on the variable valve timing control (VTC) actuator and exhaust camshaft sprocket are facing up, then set the camshafts (A) in the holder.
7. Set the camshaft holders (B) and cam chain guide B (C) in place.
8. Tighten the bolts to the specified torque. NOTE: If the engine does not have bolt (21)(Scheme 136), skip it and continue the torque sequence. Specified Torque 8 x 1.25 mm 22 N.m (2.2 kgf.m, 16 lbf.ft) 6 x 1.0 mm 12 N.m (1.2 kgf.m, 8.8 lbf.ft) 6 x 1.0 mm Bolts: (21), (22), (23)
9. Install the cam chain (see «CAM CHAIN INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__cam-chain-installation) ), and adjust the valve clearance (see «VALVE CLEARANCE ADJUSTMENT»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__valve-clearance-adjustment) ).

Scheme 136

Scheme 137

Scheme 138

Scheme 139

Scheme 140

Scheme 141

Scheme 142

Scheme 143

Scheme 144

Scheme 145

1. Install a new coolant separator in the engine block whenever the engine block is replaced.
2. Clean the cylinder head and block surface.
3. Install the new cylinder head gasket (A) and dowel pins (B) on the engine block. Always use a new cylinder head gasket.
4. Set the crankshaft to top dead center (TDC). Align the TDC mark (A) on the crankshaft sprocket with the pointer (B) on the engine block.
5. Install the cylinder head on the block.
6. Measure the diameter of each cylinder head bolt at point A and point B.
7. If either diameter is less than 10.6 mm (0.42 in.), replace the cylinder head bolt.
8. Apply engine oil to the threads and under the bolt heads of all cylinder head bolts.
9. Tighten the cylinder head bolts in sequence to 39 N.m (4.0 kgf.m, 29 lbf.ft). Use a beam-type torque wrench. When using a preset-type torque wrench, be sure to tighten slowly and do not overtighten. If a bolt makes any noise while you are torquing it, loosen the bolt and retighten it from the first step.
10. After torquing, tighten all cylinder head bolts in two steps (90° per step). If you are using a new cylinder head bolt, tighten the bolt an extra 90°. NOTE: Remove the cylinder head bolt if you tightened it beyond the specified angle, and go back to step 6 of the procedure. Do not loosen it back to the specified angle.
11. Install the rocker arm assembly (see «ROCKER ARM ASSEMBLY INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head) ).
12. Install the cam chain (see «CAM CHAIN INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#cylinder-head__cam-chain-installation) ).
13. Install the upper radiator hose (A), heater hose (B), and water bypass hose (C).
14. Install the harness clamps (A), then install the two bolts (B) securing the evaporative emission (EVAP) canister purge control valve mounting bracket.
15. Install the EVAP canister hose (A), brake booster vacuum hose (B), and vacuum hose (C).
16. Connect the fuel feed hose (A) (see «FUEL LINE/QUICK-CONNECT FITTING INSTALLATION»(/acura/rdx/i-2006-2009/remont/fuel-system/#fuel-supply-system__fuel-linequick-connect-fitting-installation) ), then install the quick-connect fitting cover (B).
17. Connect the engine wire harness connectors and wire harness clamps to the cylinder head. Engine coolant temperature (ECT) sensor 1 connector Camshaft position (CMP) sensor A (Intake) connector Camshaft position (CMP) sensor B (Exhaust) connector EVAP canister purge valve connector
18. Install the exhaust manifold and turbocharger (see «INSTALLATION»(/acura/rdx/i-2006-2009/remont/exhaust/#intake-manifold-and-exhaust-system) ).
19. Install the intake manifold (see «INSTALLATION»(/acura/rdx/i-2006-2009/remont/exhaust/#intake-manifold-and-exhaust-system) ).
20. Install the drive belt (see «DRIVE BELT REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/charging-system/#charging-system__drive-belt-removalinstallation) ).
21. Install the air cleaner housing (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/rdx/i-2006-2009/remont/mechanical/#intake-air-system) ).
22. After installation, check that all tubes, hoses and connectors are installed correctly.
23. Inspect for fuel leaks: Turn the ignition switch ON (II) (do not operate the starter) so the fuel pump runs for about 2 seconds and pressurizes the fuel line. Repeat this operation two or three times, then check for fuel leakage at any point in the fuel line.
24. Refill the radiator with engine coolant, and bleed the air from the cooling system with the heater valve open (see step 6 under «COOLANT REPLACEMENT»(/acura/rdx/i-2006-2009/remont/cooling-system-mechanical/#cooling-system) ).
25. Inspect the idle speed (see «IDLE SPEED INSPECTION»(/acura/rdx/i-2006-2009/remont/engine-control-systems/#idle-control-system__idle-speed-inspection) ).
26. Inspect the ignition timing (see «IGNITION TINNING INSPECTION»(/acura/rdx/i-2006-2009/remont/ignition-system/#ignition-system) ).

Sealing Bolt Installation

Note. When installing the sealing bolt, always use a new washer.

Scheme 146

See also:
• HDS CLEAR COMMAND
• HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM)
• DLC CIRCUIT TROUBLESHOOTING
• IGNITION COIL REMOVAL/INSTALLATION
• ENGINE REMOVAL
• DRIVE BELT REMOVAL/INSTALLATION
• ENGINE INSTALLATION
• VTC OIL CONTROL SOLENOID VALVE REMOVAL/TEST/INSTALLATION
• AIR CLEANER REMOVAL/INSTALLATION
• OIL PUMP CHAIN REPLACEMENT
• OIL PAN REMOVAL
• OIL PAN INSTALLATION
• REMOVAL
• FUEL PRESSURE RELIEVING
• COOLANT CHECK
• FUEL LINE/QUICK-CONNECT FITTING REMOVAL
• CMP SENSOR B REPLACEMENT
• FUEL LINE/QUICK-CONNECT FITTING INSTALLATION
• IDLE SPEED INSPECTION
• CYLINDER HEAD COVER REMOVAL
• VALVE CLEARANCE ADJUSTMENT
• CAM CHAIN REMOVAL
• CAM CHAIN INSTALLATION
• CRANKSHAFT PULLEY REMOVAL AND INSTALLATION
• CHAIN CASE OIL SEAL INSTALLATION
• CAMSHAFT INSPECTION
• ROCKER ARM AND SHAFT DISASSEMBLY/REASSEMBLY
• VALVE, SPRING, AND VALVE SEAL REMOVAL
• VALVE INSPECTION
• VALVE GUIDE REPLACEMENT