Cylinder Head Acura MDX I

Scheme 70

Scheme 71

Scheme 72

Scheme 73

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 PCM RESET ).

Scheme 74

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 in «GENERAL TROUBLESHOOTING INFORMATION»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
4. Turn the ignition switch ON (II), and select PGM-FI, INSPECTION, then ALL INJECTORS OFF function on the HDS
5. Remove the six ignition coils (see «IGNITION COIL REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/ignition-system/#ignition-system) ).
6. Remove the six spark plugs.
7. Attach the compression gauge to a spark plug hole.
8. Crank the engine with the starter motor and measure the compression. Compression Pressure: Above 930 kPa (9.5 kgf/cm 2 , 135 psi)
9. Measure the compression on the remaining cylinders. Maximum Variation: Within 200 kPa (2.0 kgf/cm 2 , 28 psi)
10. If the compression is not within specification, check the following items, then remeasure the compression. Damaged or worn valves and seats Damaged cylinder head gaskets Damaged or worn piston rings Damaged or worn piston and cylinder bore
11. Select PCM reset (see «PCM RESET»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__pcm-reset) ) to cancel ALL INJECTORS OFF function on the HDS.

VTEC Rocker Arm Test

Special Tools Required

1. VTEC air adapter 07VAJ-P8A010A
2. VTEC air stopper 070AJ-0030100
3. Air pressure regulator 07AAJ-PNAA100

Scheme 75

Scheme 76

Scheme 77

Scheme 78

1. Start the engine and let it run for 5 minutes, then turn the ignition switch OFF.
2. Remove the intake manifold (see «REMOVAL»(/acura/mdx/i-2000-2006/remont/exhaust/#intake-manifold-and-exhaust-system) ).
3. Remove the cylinder head covers (see «CYLINDER HEAD COVER REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
4. Set the No. 1 piston at top dead center (TDC) (see step 3 in «VALVE CLEARANCE ADJUSTMENT»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head__valve-clearance-adjustment) )
5. Push on the intake mid rocker arm (A) for the No. 1 cylinder. The mid rocker arm should move independently of the primary rocker arm (B) and secondary rocker arm (C). If the mid rocker arm moves freely, go to step 6. If the intake mid rocker arm does not move, remove the mid, primary, and secondary intake rocker arms as an assembly, then check that the pistons in the mid and primary rocker arms move smoothly. If any rocker arm needs replacing, replace the mid, primary, and secondary rocker arms as an assembly, and retest.
6. Repeat step 5 on the remaining intake mid rocker arms with each piston at TDC. When all the mid rocker arms pass the test, go to step 7.
7. Check that the air pressure on the shop air compressor gauge indicates over 690 kPa (7.0kgf/cm 2 100 psi).
8. Inspect the valve clearance (see «VALVE CLEARANCE ADJUSTMENT»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head__valve-clearance-adjustment) ).
9. Remove the No. 1 and No. 6 intake rocker shaft mounting bolts, then install and connect the special tools (Scheme 76)or (Scheme 77).
10. Loosen the valve on the regulator, and apply the specified air pressure. Specified Air Pressure: 440-540 kPa (4.5-5.5 kgf/cm 2, 64-78 psi) NOTE: If the synchronizing pistons do not move after applying air pressure, move the primary or secondary rocker arm up and down manually.
11. Make sure that the intake primary rocker arm (A) and intake secondary rocker arm (B) are mechanically connected by the piston and that the mid rocker arm (C) does not move when pushed manually. If any intake mid rocker arm moves independently of the primary and secondary rocker arms, replace the rocker arms as a set.
12. Remove the special tools.
13. Tighten the rocker shaft bolts to 24 N.m (2.4 kgf.m, 17 lbf.ft)
14. Install the cylinder head covers (see «CYLINDER HEAD COVER INSTALLATION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
15. Install the intake manifold (see «INSTALLATION»(/acura/mdx/i-2000-2006/remont/exhaust/#intake-manifold-and-exhaust-system) ).

Valve Clearance Adjustment

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

Scheme 79

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Scheme 88

1. Remove the intake manifold (see «REMOVAL»(/acura/mdx/i-2000-2006/remont/exhaust/#intake-manifold-and-exhaust-system) ).
2. Remove the cylinder head covers (see «CYLINDER HEAD COVER REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
3. Set the No. 1 piston at top dead center (TDC). Align the pointer (A) on the front upper cover with the No. 1 piston TDC mark (B) on the front camshaft pulley.
4. Select the correct thickness feeler gauge for the valves you're going to check. Valve Clearance Intake: 0.20-0.24 mm (0.008-0.009 in.) Exhaust: 0.28-0.32 mm (0.011-0.013 in.)
5. Insert the feeler gauge (A) between the adjusting screw and the end of the valve stem on No. 1 cylinder, and slide it back and forth; you should feel a slight amount of drag.
6. If you feel too much or too little drag, loosen the locknut (A), and turn the adjusting screw (B) until the drag on the feeler gauge is correct.
7. Tighten the locknut and recheck the clearance. Repeat the adjustment, if necessary.
8. Rotate the crankshaft clockwise. Align the pointer (A) on the front upper cover with the No. 4 piston TDC mark (B) on the front camshaft pulley.
9. Check and, if necessary, adjust the valve clearance on No. 4 cylinder.
10. Rotate the crankshaft clockwise. Align the pointer (A) on the front upper cover with the No. 2 piston TDC mark (B) on the front camshaft pulley.
11. Check and, if necessary, adjust the valve clearance on No. 2 cylinder.
12. Rotate the crankshaft clockwise. Align the pointer (A) on the front upper cover with the No. 5 piston TDC mark (B) on the front camshaft pulley.
13. Check and, if necessary, adjust the valve clearance on No. 5 cylinder.
14. Rotate the crankshaft clockwise. Align the pointer (A) on the front upper cover with the No. 3 piston TDC mark (B) on the front camshaft pulley.
15. Check and, if necessary, adjust the valve clearance on No. 3 cylinder.
16. Rotate the crankshaft clockwise. Align the pointer (A) on the front upper cover with the No. piston TDC mark (B) on the front camshaft pulley.
17. Check and, if necessary, adjust the valve clearance on No. 6 cylinder.
18. Install the cylinder head covers (see «CYLINDER HEAD COVER INSTALLATION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
19. Install the intake manifold (see «INSTALLATION»(/acura/mdx/i-2000-2006/remont/exhaust/#intake-manifold-and-exhaust-system) ).

Crankshaft Pulley Removal and Installation

Special Tools Required

1. Holder handle 07JAB-001020A
2. Holder attachment, 50 mm, offset 07MAB-PY3010A
3. Socket, 19 mm 07JAA-001020A, or a commercially available 19 mm socket

Scheme 89

Scheme 90

1. Remove the right front wheel.
2. Remove the splash shield.
3. Remove the drive belt (see «DRIVE BELT REPLACEMENT»(/acura/mdx/i-2000-2006/remont/charging-system/#charging-system__drive-belt-replacement) ).
4. Hold the pulley with the holder handle (A) and holder attachment (B).
5. Remove the bolt with a heavy duty 19 mm socket (C) and breaker bar, then remove the crankshaft pulley.

Scheme 91

Scheme 92

Scheme 93

1. Remove any oil or clean the pulleys (A), crankshaft (B), bolt (C), and washer (D). Lubricate new engine oil (Scheme 91)
2. Install the crankshaft pulley, and tighten the bolt. Do not use an impact wrench. -1 Hold the pulley with the handle (A) and holder attachment (B), then tighten the bolt to 64 N.m (6.5 kgf.m, 47 lbf.ft) with a torque wrench and 19 mm socket (C). -2 Mark (D) the bolt head and crankshaft pulley (Scheme 93), then tighten the bolt an additional 60° (The mark on the bolt head line up with the mark on the crankshaft pulley).
3. Install the drive belt (see «DRIVE BELT REPLACEMENT»(/acura/mdx/i-2000-2006/remont/charging-system/#charging-system__drive-belt-replacement) ).
4. Install the splash shield.
5. Install the right front wheel.

Scheme 94

Scheme 95

1. Remove the drive belt (see «DRIVE BELT REPLACEMENT»(/acura/mdx/i-2000-2006/remont/charging-system/#charging-system__drive-belt-replacement) ).
2. Remove the front upper cover.
3. Inspect the timing belt for cracks and oil or coolant contamination. Replace the belt if it is cracked, or is contaminated with oil or coolant. Wipe off any oil or solvent that gets on the belt.

Scheme 96

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Scheme 100

Scheme 101

Scheme 102

Scheme 103

Scheme 104

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Scheme 106

1. Turn the crankshaft so its white mark (A) lines up with the pointer (B).
2. Check that the No. 1 piston top dead center (TDC) mark (A) on the front camshaft pulley and the pointer (B) on the front upper cover are aligned.
3. Remove the right front wheel.
4. Remove the splash shield.
5. Remove the drive belt (see «DRIVE BELT REPLACEMENT»(/acura/mdx/i-2000-2006/remont/charging-system/#charging-system__drive-belt-replacement) ).
6. Support the engine with a jack and wood block under the oil pan.
7. Remove the upper half of the side engine mount bracket.
8. Remove the crankshaft pulley (see «CRANKSHAFT PULLEY REMOVAL AND INSTALLATION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head__crankshaft-pulley-removal-and-installation) ).
9. Remove the front upper cover (A) and rear upper cover (B).
10. Remove the lower cover.
11. Remove one of the battery clamp bolts from the battery tray, and grind the end of it (Scheme 102)
12. Screw the battery clamp bolt in (Scheme 103)to hold the timing belt adjuster in its current position. Tighten it by hand; do not use a wrench.
13. Remove the timing belt guide plate (A).
14. Remove the lower side engine mount bracket.
15. Remove the idler pulley bolt (A) and idler pulley (B), then remove the timing belt. Discard the idler pulley bolt.

Timing Belt Installation

Note. The following procedure is for installing a used belt. If you are installing a new belt, refer to the timing belt replacement procedures (see TIMING BELT REPLACEMENT ).

Scheme 107

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Scheme 113

Scheme 114

Scheme 115

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Scheme 118

Scheme 119

Scheme 120

1. Clean the timing belt pulleys, timing belt guide plate, and the upper and lower covers.
2. Set the timing belt drive pulley to top dead center (TDC) by aligning the TDC mark (A) on the tooth of the timing belt drive pulley with the pointer (B) on the oil pump.
3. Set the camshaft pulleys to TDC by aligning the TDC marks (A) on the camshaft pulleys with the pointers (B) on the back covers.
4. Loosely install the idler pulley with a new idler pulley bolt so the pulley can move but does not come off.
5. If the auto-tensioner has extended and the timing belt cannot be installed, do the timing belt replacement procedure (see «TIMING BELT REPLACEMENT»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
6. Install the timing belt in a counterclockwise sequence starting with the drive pulley. Take care not to damage the timing belt when installing it.
7. Tighten the idler pulley bolt.
8. Remove the battery clamp bolt from the back cover.
9. Install the lower half of the side engine mount bracket.
10. Install the timing belt guide plate (Scheme 113)
11. Install the lower cover.
12. Install the crankshaft pulley (see «INSTALLATION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
13. Install the front upper cover (A) and rear upper cover (B).
14. Rotate the crankshaft pulley about five or six turns clockwise so the timing belt positions itself on the pulleys.
15. Turn the crankshaft pulley so its white mark (A) lines up with the pointer (B).
16. Check the camshaft pulley marks. If the camshaft pulley marks are at TDC, go to step 17. If the camshaft pulley marks are not at TDC, remove the timing belt and repeat steps 2 through 16.
17. Install the drive belt (see «DRIVE BELT REPLACEMENT»(/acura/mdx/i-2000-2006/remont/charging-system/#charging-system__drive-belt-replacement) ).
18. Install the upper half of the side engine mount bracket, then tighten the mounting bolts in the numbered sequence (Scheme 119)
19. Install the splash shield.
20. Install the right front wheel.
21. Do the crankshaft position (CKP) pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__ckp-pattern-clearckp-pattern-learn) ).

Scheme 121

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Scheme 139

1. Remove the timing belt (see «TIMING BELT REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
2. Clean the timing belt pulleys, timing belt guide plate, and the upper and lower covers.
3. Set the timing belt drive pulley to top dead center (TDC) by aligning the TDC mark (A) on the tooth of the timing belt drive pulley with the pointer (B) on the oil pump.
4. Set the camshaft pulleys to TDC by aligning the TDC marks (A) on the camshaft pulleys with the pointers (B) on the back covers.
5. Remove the battery clamp bolt from the back cover.
6. Remove the auto-tensioner.
7. Align the holes on the rod and housing of the auto-tensioner.
8. Use a hydraulic press to slowly compress the auto-tensioner. Insert a 2.0 mm (0.08 in.) pin through the housing and the rod. Make sure the pin can be removed once the auto-tensioner is installed. NOTE: The compression pressure should not exceed 9,800 N (1,000 kgf, 2,200 lbf).
9. Install the auto-tensioner. NOTE: Make sure the pin stays in place.
10. Screw the battery clamp bolt in (Scheme 127)to hold the timing belt adjuster. Tighten it by hand; do not use a wrench.
11. Loosely install the idler pulley with a new idler pulley bolt so the pulley can move but does not come off.
12. Install the timing belt in a counterclockwise sequence starting with the drive pulley.
13. Tighten the idler pulley bolt.
14. Remove the pin from the auto-tensioner.
15. Remove the battery clamp bolt from the back cover.
16. Install the lower half of the side engine mount bracket.
17. Install the timing belt guide plate (Scheme 132)
18. Install the lower cover.
19. Install the crankshaft pulley (see «INSTALLATION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
20. Install the front upper cover (A) and rear upper cover (B).
21. Rotate the crankshaft pulley about five or six turns clockwise so the timing belt positions itself on the pulleys.
22. Turn the crankshaft pulley so its white mark (A) lines up with the pointer (B).
23. Check the camshaft pulley marks. If the camshaft pulley marks are at TDC, go to step 24. If the camshaft pulley marks are not at TDC, remove the timing belt and repeat steps 2 through 23.
24. Install the upper half of the side engine mount bracket, then tighten the mounting bolts in the numbered sequence (Scheme 138)
25. Install the drive belt (see «DRIVE BELT REPLACEMENT»(/acura/mdx/i-2000-2006/remont/charging-system/#charging-system__drive-belt-replacement) ).
26. Install the splash shield.
27. Install the right front wheel.
28. Do the crankshaft position (CKP) pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__ckp-pattern-clearckp-pattern-learn) ).

Scheme 140

1. Remove the timing belt (see «TIMING BELT REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
2. Remove the auto-tensioner (see step 6 in «TIMING BELT REPLACEMENT»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
3. Remove the bolt (A), then remove the timing belt adjuster (B) and collar (C).
4. Install in the reverse order of removal.
5. Install the timing belt (see «TIMING BELT INSTALLATION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head__timing-belt-installation) ).

Scheme 141

1. Remove the timing belt (see «TIMING BELT REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
2. Remove the crankshaft position (CKP) sensor A/B (see «CKP SENSOR REPLACEMENT»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#pgm-fi-system) ).
3. Remove the timing belt drive pulley (A) and key (B).
4. Inspect the timing belt pulley and key for damage. If it is cracked or damaged, replace the timing belt drive pulley.
5. Install the new timing belt drive pulley.
6. Install the CKP sensor A/B (see «CKP SENSOR REPLACEMENT»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#pgm-fi-system) ).
7. Install the timing belt (see «TIMING BELT INSTALLATION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head__timing-belt-installation) ).
8. Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__ckp-pattern-clearckp-pattern-learn) ).

Scheme 142

Scheme 143

Scheme 144

Scheme 145

1. Remove the intake manifold (see «REMOVAL»(/acura/mdx/i-2000-2006/remont/exhaust/#intake-manifold-and-exhaust-system) ).
2. Remove the six ignition coils (see «IGNITION COIL REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/ignition-system/#ignition-system) ).
3. Remove the dipstick.
4. Remove the two bolts (A) securing the harness holder, and remove the positive crankcase ventilation (PCV) hose (B).
5. Disconnect the three injector connectors from the injectors on the cylinder head (see «INJECTOR REPLACEMENT»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#pgm-fi-system) ).
6. Remove the power steering hose bracket mounting bolt (A) and the harness holder mounting bolts (B).
7. Remove the harness clamps (C) and breather hose (D).
8. Remove the cylinder head cover. FRONT REAR

Scheme 146

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Scheme 149

Scheme 150

1. Clean the head cover contacting surfaces with a shop towel.
2. Visually check the spark plug seals for damage. Replace if necessary.
3. Set the spark plug seals (A) on the spark plug tubes, and install the cylinder head cover (B).
4. Inspect the cover washer (C). Replace any washer that is damaged or deteriorated.
5. Tighten the bolts in two or three steps. In the final step tighten all bolts, in sequence, 12 N.m (1.2 kgf.m, 8.7 lbf.ft).
6. Tighten the harness holder mounting bolts (A) and the power steering hose bracket mounting bolt (B).
7. Install the harness clamps (C) and breather hose (D).
8. Connect the three injector connectors to the injectors on the cylinder head.
9. Tighten the two bolts (A) securing the harness holder, and install the positive crankcase ventilation (PCV) hose (B).
10. Install the dipstick
11. Install the six ignition coils (see «IGNITION COIL REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/ignition-system/#ignition-system) ).
12. Install the intake manifold (see «INSTALLATION»(/acura/mdx/i-2000-2006/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 any other wiring or hoses, or interfere with any other parts.

Scheme 151

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Scheme 160

Scheme 161

1. Make sure you have the anti-theft codes for the radio and the navigation system, then write down the customer's audio presets. Make sure the ignition switch is OFF.
2. Relieve the fuel pressure (see «FUEL PRESSURE RELIEVING»(/acura/mdx/i-2000-2006/remont/fuel-system/#fuel-supply-system__fuel-pressure-relieving) ).
3. Disconnect the negative cable from the battery.
4. Drain the engine coolant (see «COOLANT REPLACEMENT»(/acura/mdx/i-2000-2006/remont/cooling-system-mechanical/#cooling-system) ).
5. Remove the drive belt (see «DRIVE BELT REPLACEMENT»(/acura/mdx/i-2000-2006/remont/charging-system/#charging-system__drive-belt-replacement) ).
6. Remove the power steering (P/S) pump (A) and the bolt (B) securing the P/S hose bracket.
7. Remove the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/mdx/i-2000-2006/remont/charging-system/#charging-system) ).
8. Remove the intake manifold (see «REMOVAL»(/acura/mdx/i-2000-2006/remont/exhaust/#intake-manifold-and-exhaust-system) ).
9. Remove the six ignition coils (see «IGNITION COIL REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/ignition-system/#ignition-system) ).
10. Remove the timing belt (see «TIMING BELT REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
11. Remove these engine wire harness connectors and wire harness clamps from the cylinder head: Six injector connectors Engine coolant temperature (ECT) sensor connector Camshaft position (CMP) sensor connector Crankshaft position (CKP) sensor A/B connector Exhaust gas recirculation (EGR) valve connector Rocker arm oil control solenoid (VTEC solenoid valve) connector Rocker arm oil pressure switch (VTEC oil pressure switch) connector Oil pressure switch connector Two air fuel ratio (A/F) sensor connectors Two secondary heated oxygen sensor (secondary HO2S) connectors
12. Remove the upper radiator hose (A) and lower radiator hose (B).
13. Remove the heater hose (A) and water bypass hose (B).
14. Remove the bolt securing the harness bracket.
15. Remove the bolt securing the harness bracket.
16. 2003-2004 models: Remove the fuel feed hose.
17. 2005-2006 models: Remove the quick-connect fitting cover (A), then disconnect the fuel feed hose (see «FUEL LINE/QUICK-CONNECT FITTING REMOVAL»(/acura/mdx/i-2000-2006/remont/fuel-system/#fuel-supply-system__fuel-linequick-connect-fitting-removal) ).
18. 2005-2006 models: Remove the two nuts securing the purge joint.
19. Remove the fuel rails (see «COMPONENT LOCATION INDEX»(/acura/mdx/i-2000-2006/remont/fuel-system/#fuel-supply-system) ).
20. Remove the front and rear warm up three way catalytic converter (WU-TWC) (see «WARM UP TWC REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#catalytic-converter-system) ).
21. Remove the water passage.
22. Remove the front and rear camshaft pulleys (A) and front and rear back covers (B).
23. Remove the cylinder head cover (see «CYLINDER HEAD COVER REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
24. Remove the cylinder head bolts. To prevent warpage, unscrew the bolts in sequence 1/3 turn at a time; repeat the sequence until all bolts are loosened.
25. Remove the cylinder head.

Scheme 162

Scheme 163

1. Make sure you have the anti-theft codes for the radio and the navigation system, then write down the customer's radio station and XM radio channel presets. Make sure the ignition switch is OFF.
2. Disconnect the negative cable from the battery first, then the positive cable. Remove the battery.
3. Drain the engine coolant (see «COOLANT REPLACEMENT»(/acura/mdx/i-2000-2006/remont/cooling-system-mechanical/#cooling-system) ).
4. Remove the upper radiator hose.
5. Remove the exhaust gas recirculation (EGR) valve (see «EGR VALVE REPLACEMENT»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#egr-system) ).
6. Remove the timing belt (see «TIMING BELT REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
7. Remove the rocker arm assembly (see «ROCKER ARM ASSEMBLY REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
8. Remove the front camshaft pulley.
9. Remove the thrust cover (A), then remove the camshaft (B).
10. Install the camshaft in the reverse order of removal. Always use a new O-ring (C). Apply new engine oil to the camshaft lobes and journals.
11. Apply new engine oil to the threads of the camshaft pulley mounting bolt, then install the front camshaft pulley (see step 11 in «CAMSHAFT, ROCKER ARM, CAMSHAFT SEAL, AND PULLEY INSTALLATION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
12. Install the rocker arm assembly, then tighten the mounting bolts (see step 9 in «CAMSHAFT, ROCKER ARM, CAMSHAFT SEAL, AND PULLEY INSTALLATION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
13. Install the timing belt (see «TIMING BELT INSTALLATION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head__timing-belt-installation) ).
14. Adjust the valve clearance (see «VALVE CLEARANCE ADJUSTMENT»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head__valve-clearance-adjustment) ).
15. Install the upper radiator hose.
16. Install the battery. Clean the battery posts and cable terminals with sandpaper, then assemble them and apply grease to prevent corrosion.
17. Fill the radiator with engine coolant and bleed the air out from the system (see step 8 in «COOLANT REPLACEMENT»(/acura/mdx/i-2000-2006/remont/cooling-system-mechanical/#cooling-system) ).
18. Do the powertrain control module (PCM) reset procedure (see «PCM RESET»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__pcm-reset) ).
19. Do the crankshaft position (CKP) pattern clear/CKP pattern lean procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__ckp-pattern-clearckp-pattern-learn) ).
20. Reset the power window control unit (see «RESETTING THE POWER WINDOW CONTROL UNIT»(/acura/mdx/i-2000-2006/remont/windows/#power-windows) ).
21. Enter the anti-theft codes for the radio and the navigation system, then enter the customer's radio station and XM radio channel presets.
22. Set the clock.

Scheme 164

Scheme 165

Scheme 166

1. Make sure you have the anti-theft codes for the radio and the navigation system, then write down the customer's radio station and XM radio channel presets. Make sure the ignition switch is OFF.
2. Relieve the fuel pressure (see «FUEL PRESSURE RELIEVING»(/acura/mdx/i-2000-2006/remont/fuel-system/#fuel-supply-system__fuel-pressure-relieving) ).
3. Disconnect the negative cable from the battery first, then disconnect the positive cable.
4. Remove the under-hood fuse/relay box.
5. Drain the engine coolant (see «COOLANT REPLACEMENT»(/acura/mdx/i-2000-2006/remont/cooling-system-mechanical/#cooling-system) ).
6. 2003-2004 models: Remove the fuel feed hose (see step 16 in «CYLINDER HEAD REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
7. 2003-2004 models: Remove the nuts (A) securing the fuel line.
8. Remove the brake lines from the master cylinder (see «MASTER CYLINDER REPLACEMENT»(/acura/mdx/i-2000-2006/remont/mechanical-hydraulic/#conventional-brake-components__master-cylinder-replacement) ).
9. Remove the timing belt (see «TIMING BELT REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
10. Remove the rocker arm assembly (see «ROCKER ARM ASSEMBLY REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
11. Remove the rear camshaft pulley.
12. 2005-2006 models: Remove the two nuts securing the purge joint.
13. Remove the thrust cover (A), then remove the camshaft (B).
14. Install the camshaft in the reverse order of removal. Always use a new O-ring (C). Apply new engine oil on the camshaft lobes and journals.
15. Apply new engine oil to the threads of the camshaft pulley mounting bolt, then install the rear camshaft pulley (see step 11 in «CAMSHAFT, ROCKER ARM, CAMSHAFT SEAL, AND PULLEY INSTALLATION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
16. Install the rocker arm assembly, then tighten the mounting bolts (see step 9 in «CAMSHAFT, ROCKER ARM, CAMSHAFT SEAL, AND PULLEY INSTALLATION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
17. Install the timing belt (see «TIMING BELT INSTALLATION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head__timing-belt-installation) ).
18. Adjust the valve clearance (see «VALVE CLEARANCE ADJUSTMENT»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head__valve-clearance-adjustment) ).
19. Install the under-hood fuse/relay box.
20. Connect the negative cable to the battery.
21. 2003-2004 models: 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.
22. Fill the radiator with engine coolant and bleed the air out from the system (see step 8 in «COOLANT REPLACEMENT»(/acura/mdx/i-2000-2006/remont/cooling-system-mechanical/#cooling-system) ).
23. Do the PCM reset procedure (see «PCM RESET»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__pcm-reset) ).
24. Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__ckp-pattern-clearckp-pattern-learn) ).
25. Reset the power window control unit (see «RESETTING THE POWER WINDOW CONTROL UNIT»(/acura/mdx/i-2000-2006/remont/windows/#power-windows) ).
26. Enter the anti-theft codes for the radio and navigation system, then enter the customer's radio station and XM radio channel presets.
27. Set the clock.

Scheme 167

1. Remove the cylinder head (see «CYLINDER HEAD REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
2. Inspect the camshaft (see «CAMSHAFT INSPECTION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
3. Check the cylinder head for warpage. Measure along the edges, and three ways 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 121 mm (4.76 in.). Cylinder Head Height Standard (New): 120.95-121.05 mm (4.762-4.766 in.)

Scheme 168

Scheme 169

1. Remove the cylinder head cover (see «CYLINDER HEAD COVER REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
2. Loosen the adjusting screws (A).
3. Remove the bolts and the rocker arm assembly. -1 Unscrew the rocker shaft mounting bolts at two turns at a time, to prevent damaging the valves or rocker arm assembly. -2 When removing the rocker arm assembly, do not remove the rocker shaft mounting bolts. The bolts will keep the springs and the rocker arms on the shafts.

Rocker Arm and Shaft Disassembly/Reassembly

Note. Identify parts as they are removed so they can be reinstalled in their original locations. Inspect the rocker shafts and rocker arms (see ROCKER ARM AND SHAFT INSPECTION ). Rocker arms must be installed in the same positions if reused. When removing or installing the rocker arm assembly, do not remove the rocker shaft mounting bolts. The bolts will keep the springs and rocker arms on the shaft. Bundle the intake rocker arms with rubber bands to keep them together as a set. Prior to reassembling, clean all the parts in solvent, dry them and apply new engine oil to any contact points. When replacing the intake rocker arm assembly, remove the fastening hardware from the new intake rocker arm assembly.

Scheme 170

Scheme 171

Scheme 172

Scheme 173

1. Remove the rocker arm assembly (see «ROCKER ARM ASSEMBLY REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
2. Disassemble the rocker arm assembly (see «ROCKER ARM AND SHAFT DISASSEMBLY/REASSEMBLY»(/acura/mdx/i-2000-2006/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. Intake Rocker Arm-to-Shaft Clearance Standard (New): 0.026-0.067 mm (0.0010-0.0026 in.) Service Limit: 0.067 mm (0.0026 in.) Exhaust Rocker Arm-to-Shaft Clearance Standard (New): 0.026-0.077 mm (0.0010-0.0030 in.) Service Limit: 0.077 mm (0.0030 in.)
6. Repeat for all rockers and both shafts. If the clearance is over the limit, replace the rocker shaft and all over-tolerance rocker arms. If any intake rocker arm needs replacement, replace all three rocker arms in that set (primary, mid, and secondary). VTEC Rocker Arms
7. Inspect the rocker arm synchronizing pistons (A). Slide them into the rocker arms, if they do not move smoothly, replace the rocker arm set. NOTE: Apply new engine oil to the pistons when reassembling. When reassembling the primary rocker arm (B), carefully apply air pressure to the oil passage of the rocker arm.
8. Reassemble the rocker arm assembly (see «ROCKER ARM AND SHAFT DISASSEMBLY/REASSEMBLY»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head__rocker-arm-and-shaft-disassemblyreassembly) ).

Scheme 174

Scheme 175

Scheme 176

Scheme 177

Scheme 178

Scheme 179

Scheme 180

Scheme 181

1. Remove the cylinder head (see «CYLINDER HEAD REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
2. Remove the rocker arms (see «ROCKER ARM ASSEMBLY REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
3. Put the rocker shafts on the cylinder head, then tighten the bolts to the specified torque. NOTE: Apply new engine oil to the threads and flange of the exhaust rocker shaft mounting bolts. Specified Torque 8 x 1.25 mm: 24 N.m (2.4 kgf.m, 17 lbf.ft)
4. Seat the camshaft by pushing it toward the rear of the cylinder head.
5. Zero the dial indicator against the end of the camshaft. Push the camshaft back and forth and read the end play. If the end play is beyond the service limit, replace the thrust cover 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: 0.20 mm (0.008 in.)
6. Remove the camshaft thrust cover (A), then pull out the camshaft (B).
7. Wipe the camshaft clean, then inspect the lift ramps. Replace the camshaft if any lobes are pitted, scored, or excessively worn.
8. Measure the diameter of each camshaft journal.
9. Zero the gauge to the journal diameter.
10. Clean the camshaft bearing surfaces in the cylinder head. Measure the inside diameter of each camshaft bearing surface, and check for an out-of-round condition. If the camshaft-to-holder clearance is within limits, go to step 12 . 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 11. Camshaft-to-Holder Oil Clearance Standard (New): 0.050-0.089 mm (0.0020-0.0035 in.) Service Limit: 0.15 mm (0.006 in.)
11. Check 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 oil clearance. If the oil clearance is still out of tolerance, replace the cylinder head. Camshaft Total Runout Standard (New): 0.03 mm (0.001 in.) max. Service Limit: 0.04 mm (0.002 in.)
12. Measure cam lobe height.

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 182

Scheme 183

Scheme 184

Scheme 185

1. Remove the cylinder head (see «CYLINDER HEAD REMOVAL»(/acura/mdx/i-2000-2006/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 valve spring compressor, then remove the valve retainer and valve spring.
5. Install the valve guide seal remover (A).
6. Remove the valve seal.
7. Remove the valve spring seat, valve guide, and valve.

Scheme 186

1. Remove the valves (see «VALVE, SPRING, AND VALVE SEAL REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head__valve-spring-and-valve-seal-removal) ).
2. Measure the valve in these areas. Intake Valve Dimensions A Standard (New): 34.90-35.10 mm (1.374-1.382 in.) B Standard (New): 115.70-116.30 mm (4.555-4.579 in.) C Standard (New): 5.485-5.495 mm (0.2159-0.2163 in.) C Service Limit: 5.455 mm (0.2148 in.) Exhaust Valve Dimensions A Standard (New): 29.90-30.10 mm (1.177-1.185 in.) B Standard (New): 113.90-114.50 mm (4.484-4.508 in.) C Standard (New): 5.450-5.460 mm (0.2146-0.2150 in.) C Service Limit: 5.420 mm (0.2134 in.)

Scheme 187

1. Remove the valves (see «VALVE, SPRING, AND VALVE SEAL REMOVAL»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head__valve-spring-and-valve-seal-removal) ).
2. Slide the valve out of its guide about 10 mm (0.39 in.), then measure the guide-to-stem clearance with a dial indicator while rocking the stem in the direction of normal thrust (wobble method). If the measurement exceeds the service limit, recheck it using a new valve. If the measurement is now within the service limit, reassemble using a new valve. If the measurement with a new valve still exceeds the service limit, go to step 3. Intake Valve Stem-to-Guide Clearance Standard (New): 0.04-0.09 mm (0.002-0.004 in.) Service Limit: 0.16 mm (0.006 in.) Exhaust Valve Stem-to-Guide Clearance Standard (New): 0.11-0.16 mm (0.004-0.006 in.) Service Limit: 0.22 mm (0.009 in.)
3. 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): 0.020-0.045 mm (0.0008-0.0018 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

1. Valve guide driver, 5.5 mm 07742-0010100
2. Valve guide reamer, 5.5 mm 07HAH-PJ7A100

Scheme 188

Scheme 189

Scheme 190

Scheme 191

Scheme 192

1. Inspect valve stem-to-guide clearance (see «VALVE STEM-TO-GUIDE CLEARANCE INSPECTION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
2. Use a commercially available air-impact valve guide driver (A) modified to fit the diameter of the valve guides (Scheme 189) In most cases, the same procedure can be done using the special tool and a conventional hammer.
3. Select the proper replacement guides, and chill them in the freezer section of a refrigerator for about an hour.
4. 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.
5. 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. Wear safety goggles or a face shield.
6. Turn the head over, and drive the guide out toward the camshaft side of the head.
7. If a valve guide still won't move, drill it out with a 8 mm (5/16 in.) bit, then try again. NOTE: Drill guides only in extreme cases; you could damage the cylinder head if the guide breaks.
8. Take out the new guide(s) from the freezer, one at a time, as you need them.
9. Apply a thin coat of new engine oil to the outside of the new valve guide. Install the guide from the camshaft side of the head; use the special tool to drive the guide to the specified installed height (A) of the guide (B). If you have all 12 guides to do, you may have to reheat the head. Valve Guide Installed Height Intake: 21.20-22.20 mm (0.835-0.874 in.) Exhaust: 20.63-21.63 mm (0.812-0.852 in.)
10. Coat both the reamer and the valve guide with cutting oil.
11. Rotate the reamer clockwise the full length of the valve guide bore.
12. Continue to rotate the reamer clockwise while drawing it from the bore.
13. Thoroughly wash the guide in detergent and water to remove any cutting residue.
14. Check the clearance with a valve (see «VALVE STEM-TO-GUIDE CLEARANCE INSPECTION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ). Verify that a valve slides in the intake and exhaust valve guides without resistance or getting stuck.
15. Inspect the valve spring, if necessary renew the valve seat using a valve cutter (see «VALVE SEAT RECONDITIONING»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).

Scheme 193

Scheme 194

Scheme 195

Scheme 196

1. Inspect valve stem-to-guide clearance (see «VALVE STEM-TO-GUIDE CLEARANCE INSPECTION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ). If the valve guides are worn, replace them (see «VALVE GUIDE REPLACEMENT»(/acura/mdx/i-2000-2006/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 edge of the seat with the 30° cutter and the lower edge of the seat with the 67.5° cutter (intake seat) or the 60° cutter (exhaust seat). 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 it 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) (Scheme 196)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 (intake seat) or the 60° cutter (exhaust seat) to move it down, then one more cut with the 45° cutter to restore seat width. If it is too low (closer to the valve edge), you must make a second cut with the 30° cutter to move it up, then 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 the valve stem installed height (A). Intake Valve Stem Installed Height Standard (New): 46.75-47.55 mm (1.841-1.872 in.) Service Limit: 47.80 mm (1.882 in.) Exhaust Valve Stem Installed Height Standard (New): 46.68-47.48 mm (1.838-1.869 in.) Service Limit: 47.73 mm (1.879 in.)
9. If the valve stem installed height is over the service limit, replace the valve and recheck. If it is still over 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 197

Scheme 198

Scheme 199

1. Coat the valve stems with new 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: Exhaust valve seals (C) have a black spring (D) and intake valve seals (E) have 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 positioned towards 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 cotters. Tap the valve stem only along its axis so you do not bend the stem.

Scheme 200

Scheme 201

Scheme 202

Scheme 203

Scheme 204

1. Apply a light coat of new engine oil around the camshaft oil seal.
2. Gently tap the new camshaft oil seal (A) into the cylinder head. -1 Tap the camshaft oil seal in squarely. -2 Install the oil seal about 0.5-1.5 mm (0.02-0.06 in.) below the surface of the cylinder head.
3. Insert the camshaft (B) into the cylinder head, then install the camshaft thrust cover (C). Always use a new O-ring (D).
4. Check that the oil seal lips are not distorted.
5. Install the solid dowel pins (E) and the hollow dowel pins (F).
6. Loosen the valve adjusting screws.
7. If necessary, reassemble the rocker arm assembly (see «ROCKER ARM AND SHAFT DISASSEMBLY/REASSEMBLY»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head__rocker-arm-and-shaft-disassemblyreassembly) ).
8. Set the rocker arm assembly in place, and loosely install the bolts. Make sure that the rocker arms are properly positioned on the valve stems.
9. Tighten each bolt two turns at a time in the sequence (Scheme 203)to ensure that the rockers do not bind on the valves. NOTE: Apply new engine oil to the threads and flange of the exhaust rocker shaft mounting bolts. Specified Torque 8 x 1.25 mm: 24 N.m (2.4 kgf.m, 17 lbf.ft)
10. Install the injector base (A). Always use a new gasket (B).
11. Apply new engine oil to the threads of the camshaft pulley mounting bolt (A). Install the back cover (B), then install the camshaft pulley (C).

Install the cylinder head in the reverse order of removal

Scheme 205

Scheme 206

Scheme 207

Scheme 208

Scheme 209

Scheme 210

Scheme 211

Scheme 212

Scheme 213

Scheme 214

Scheme 215

Scheme 216

Scheme 217

Scheme 218

Scheme 219

Scheme 220

Scheme 221

1. Clean the cylinder head and engine block surface.
2. Clean and install the oil control orifices (A) with new O-rings (B).
3. Install the dowel pins (C) and new cylinder head gaskets (D).
4. Clean the timing belt pulleys, timing belt guide plate, and the upper and lower covers.
5. Set the timing belt drive pulley to top dead center (TDC) by aligning the TDC mark (A) on the tooth of the timing belt drive pulley with the pointer (B) on the oil pump.
6. Set the camshaft pulleys to TDC by aligning the TDC marks (A) on the camshaft pulleys with the pointers (B) on the back covers.
7. Install the cylinder head onto the engine block.
8. Install the cylinder head bolts: 6 point bolt: Go to step 9. 12 point bolt: Go to step 11 . Tightening sequence for 6 point bolts NOTE: Do not intermix cylinder head bolt types on the cylinder head. Make sure the cylinder head bolts are all the same type (6 point).
9. Apply new engine oil to the threads and flanges of the cylinder head bolts.
10. Tighten the cylinder head bolts sequentially in three steps. Then go to step 16 . NOTE: Perform each step twice. 1st Step Torque: 39 N.m (4.0 kgf.m, 29 lbf.ft) 2nd Step Torque: 69 N.m (7.0 kgf.m, 51 lbf.ft) 3rd Step Torque: 98.1 N.m (10.0 kgf.m, 72.3 lbf.ft) Use a beam-type torque wrench. When using a preset-type torque wrench, be sure to tighten slowly and not to overtighten. If a bolt makes any noise while you are torquing it, loosen the bolt, and retighten it from the 1st step. Tightening sequence for 12 point bolts NOTE: Do not mix cylinder bolt types on the cylinder head. Make sure the cylinder head bolts are all the same type (12 point).
11. Measure the diameter of each cylinder head bolt at point A and point B.
12. If either diameter is less than 10.6 mm (0.42 in.), replace the cylinder head bolt.
13. Apply new engine oil to the threads and under the bolt heads of all cylinder head bolts.
14. Tighten the cylinder head bolts in sequence to 29 N.m (30 kgf.m, 22 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.
15. 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 11 of the procedure. Do not loosen it back to the specified angle.
16. Install the timing belt (see «TIMING BELT INSTALLATION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head__timing-belt-installation) ).
17. Adjust the valve clearance (see «VALVE CLEARANCE ADJUSTMENT»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head__valve-clearance-adjustment) ).
18. Install the cylinder head cover (see «CYLINDER HEAD COVER INSTALLATION»(/acura/mdx/i-2000-2006/remont/mechanical/#cylinder-head) ).
19. Install the front and rear warm up three way catalytic converter (WU-TWC) (see «WARM UP TWC REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#catalytic-converter-system) ).
20. Install the water passage (A). Always use a new O-ring (B) and new gaskets (C).
21. Set the new O-rings to the injectors, then install the fuel rails (see «COMPONENT LOCATION INDEX»(/acura/mdx/i-2000-2006/remont/fuel-system/#fuel-supply-system) ).
22. 2005-2006 models: Install the purge joint.
23. 2003-2004 models: Install the fuel feed hose (A) with new washers (B).
24. 2005-2006 models: Connect the fuel feed hose (see «FUEL LINE/QUICK-CONNECT FITTING INSTALLATION»(/acura/mdx/i-2000-2006/remont/fuel-system/#fuel-supply-system__fuel-linequick-connect-fitting-installation) ), then install the quick-connect fitting cover (A).
25. Tighten the bolt securing the harness bracket.
26. Tighten the bolt securing the harness bracket.
27. Install the heater hose (A) and water bypass hose (B).
28. Install the upper radiator hose (A) and lower radiator hose (B).
29. Install the intake manifold (see «INSTALLATION»(/acura/mdx/i-2000-2006/remont/exhaust/#intake-manifold-and-exhaust-system) ).
30. Install the engine wire harness connectors and wire harness clamps to the cylinder head: Six injector connectors Engine coolant temperature (ECT) sensor connector Camshaft position (CMP) sensor connector Crankshaft position (CKP) sensor A/B connector Exhaust gas recirculation (EGR) valve connector Rocker arm oil control solenoid (VTEC solenoid valve) connector Rocker arm oil pressure switch (VTEC oil pressure switch) connector Oil pressure switch connector Two air fuel ratio (A/F) sensor connectors Two secondary heated oxygen sensor (secondary HO2S) connectors
31. Install the power steering (P/S) pump (A), and tighten the bolt (B) securing the P/S hose bracket.
32. Install the alternator (see «INSTALLATION»(/acura/mdx/i-2000-2006/remont/charging-system/#charging-system) ).
33. Install the six ignition coils (see «IGNITION COIL REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/ignition-system/#ignition-system) ).
34. Install the drive belt (see «DRIVE BELT REPLACEMENT»(/acura/mdx/i-2000-2006/remont/charging-system/#charging-system__drive-belt-replacement) ).
35. Clean the battery posts and cable terminals with sandpaper, then assemble them and apply grease to prevent corrosion.
36. After installation, check that all tubes, hoses, and connectors are installed correctly.
37. 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.
38. Refill the radiator with engine coolant, and bleed air from the cooling system with the heater valve open (see step 8 in «COOLANT REPLACEMENT»(/acura/mdx/i-2000-2006/remont/cooling-system-mechanical/#cooling-system) ).
39. Do the crankshaft position (CKP) pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__ckp-pattern-clearckp-pattern-learn) ).
40. Reset the power window control unit (see «RESETTING THE POWER WINDOW CONTROL UNIT»(/acura/mdx/i-2000-2006/remont/windows/#power-windows) ).
41. Inspect the idle speed (see «IDLE SPEED INSPECTION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#idle-control-system__idle-speed-inspection) ).
42. Inspect the ignition timing (see «IGNITION TIMING INSPECTION»(/acura/mdx/i-2000-2006/remont/ignition-system/#ignition-system) ).
43. Install the intake manifold cover (see «INSTALLATION»(/acura/mdx/i-2000-2006/remont/exhaust/#intake-manifold-and-exhaust-system) ).
44. Enter the anti-theft codes for the radio and the navigation system, then enter the customer's audio presets.
45. Set the clock.

Camshaft Oil Seal Installation - In Car

Special Tools Required

Camshaft oil seal driver 07PAF-0030100

Scheme 222

1. Dry the camshaft oil seal housing.
2. Apply a light coat of multipurpose grease to the lip of the camshaft oil seal.
3. Using the special tool (A), washer (B), and a 12 x 75 x 1.25 mm bolt (C), press in the camshaft oil seal (D) about 0.5-1.5 mm (0.02-0.06 in.) below the surface of the cylinder head.

See also:
• PCM RESET
• GENERAL TROUBLESHOOTING INFORMATION
• IGNITION COIL REMOVAL/INSTALLATION
• REMOVAL
• DRIVE BELT REPLACEMENT
• CKP PATTERN CLEAR/CKP PATTERN LEARN
• CKP SENSOR REPLACEMENT
• FUEL PRESSURE RELIEVING
• COOLANT REPLACEMENT
• ALTERNATOR REMOVAL AND INSTALLATION
• FUEL LINE/QUICK-CONNECT FITTING REMOVAL
• COMPONENT LOCATION INDEX
• WARM UP TWC REMOVAL/INSTALLATION
• EGR VALVE REPLACEMENT
• RESETTING THE POWER WINDOW CONTROL UNIT
• MASTER CYLINDER REPLACEMENT
• FUEL LINE/QUICK-CONNECT FITTING INSTALLATION
• IDLE SPEED INSPECTION
• CYLINDER HEAD COVER REMOVAL
• VALVE CLEARANCE ADJUSTMENT
• CRANKSHAFT PULLEY REMOVAL AND INSTALLATION
• TIMING BELT INSTALLATION
• ROCKER ARM AND SHAFT DISASSEMBLY/REASSEMBLY
• VALVE, SPRING, AND VALVE SEAL REMOVAL
• VALVE GUIDE REPLACEMENT