Engine Mechanical: Adjustments Infiniti M45 II

TENSION ADJUSTMENT

Belt tensioning is not necessary, as it is automatically adjusted by auto tensioner.

Scheme 45

1. Remove air duct (inlet). Refer to «AIR CLEANER AND AIR DUCT»(ref-159010-S06177113492005032300000) .
2. With box wrench, and while securely holding the hexagonal part in pulley center of auto tensioner, move the wrench handle in the direction of arrow (loosening direction of tensioner). CAUTION: Avoid placing hand in a location where pinching may occur if the holding tool accidentally comes off.
3. Under the above condition, insert a metal bar of approximately 6 mm (0.24 in) in diameter (hexagonal bar wrench shown as example in the figure) through the holding boss to lock auto tensioner pulley arm. Leave auto tensioner pulley arm locked until belt is installed again.
4. Remove alternator, water pump and A/C compressor belt.

Scheme 46

1. Remove air duct (inlet) and engine undercover (with power tool). Refer to «AIR CLEANER AND AIR DUCT»(ref-159010-S06177113492005032300000) .
2. Remove alternator, water pump and A/C compressor belt. Refer to «ALTERNATOR, WATER PUMP AND A/C COMPRESSOR BELT»(ref-159010-S07481497362005032300000) .
3. While securely holding the hexagonal protrusion part of auto tensioner pulley with box wrench, move the wrench handle in the direction of arrow (loosening direction of tensioner). CAUTION: Avoid placing hand in a location where pinching may occur if the holding tool accidentally comes off.
4. Under the above condition, insert a metal bar of approximately 6 mm (0.24 in) in diameter (hexagonal bar wrench shown as example in the figure) through the holding boss to lock auto tensioner pulley arm. Leave auto tensioner pulley arm locked until belt is installed again.
5. Remove power steering oil pump belt.

Adjustment

Note. Adjust valve clearance while engine is cold.

Scheme 47

Scheme 48

Scheme 49

Scheme 50

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

1. Turn crankshaft to position cam nose on camshaft of valve that must be adjusted upward.
2. Thoroughly wipe off engine oil around adjusting shim using a rag.
3. Using a extra-fine screwdriver, turn the round hole of the adjusting shim in the direction of the arrow. CAUTION: Perform (the above procedure) while camshaft do not contact with adjusting shim.
4. Compress valve spring by snapping camshaft using the camshaft pliers (SST), by pulling camshaft to the same direction of the arrow and by pushing valve lifter down. CAUTION: Be careful not to damage cam surface with the camshaft pliers (SST).
5. Place the lifter stopper (SST) between camshaft and the edge of the valve lifter to retain valve lifter. CAUTION: The lifter stopper (SST) must be placed as close to camshaft bracket as possible. Be careful not to damage cam surface with the lifter stopper (SST).
6. Remove the camshaft pliers (SST). CAUTION: When returning the camshaft pliers (SST) quickly, the lifter stopper (SST) hits and damages the journal portion of camshaft. Therefore turn the camshaft pliers slowly.
7. Blow air into the hole to separate adjusting shim from valve lifter. CAUTION: When blowing air, use goggles to protect your eyes.
8. Remove adjusting shim using a small screwdriver and a magnetic hand.
9. Determine replacement adjusting shim size following formula. Using a micrometer determine thickness of removed shim with measured at center. Calculate thickness of new adjusting shim so valve clearance comes within specified values (Cold value). R = Thickness of removed shim N = Thickness of new shim M = Measured valve clearance Intake: N = R + [M - 0.30 mm (0.0118 in.)]* Exhaust: N = R + [M - 0.33 mm (0.0130 in.)]* *: Reference data at approximately 20 ° C (68° F) Shims are available in 64 sizes from 2.32 mm (0.0913 in) to 2.95 mm (0.1161 in) in steps of 0.01 mm (0.0004 in). Select new shim with thickness as close as possible to calculated value.
10. Install new shim using a suitable tool. Install with the surface on which the thickness is stamped facing down.
11. Place the camshaft pliers (SST) as mentioned in step 4 .
12. Remove the lifter stopper (SST).
13. Remove the camshaft pliers (SST).
14. Rotate crankshaft 2 to 3 turns by hand.
15. Recheck valve clearance. (Cold value)
16. Finally check valve clearance with warmed up engine. (Hot value) Valve clearance

Scheme 56

Scheme 57

Scheme 58

1. Remove camshaft relating to valve oil seal to be removed. Refer to «CAMSHAFT»(ref-159010-S00688698492005032300000) .
2. Remove adjusting shims and valve lifters. Refer to «CAMSHAFT»(ref-159010-S00688698492005032300000) . Correctly identify location where each part is installed. Keep parts in an organized way to avoid mixing them up.
3. Turn crankshaft until the cylinder requiring new oil seals is at TDC. This will prevent the valve from dropping into cylinder.
4. Remove valve collet. Compress valve spring with the valve spring compressor, attachment and adapter (SST). Remove valve collet with magnetic hand. CAUTION: When working, take care not to damage valve lifter holes.
5. Remove valve spring retainer and valve spring (with valve spring seat). CAUTION: Do not remove valve spring seat from valve spring.
6. Remove valve oil seal using the valve oil seal puller (SST).

Scheme 59

1. Apply engine oil on new valve oil seal joint and seal lip.
2. Install valve oil seal. Install with the valve oil seal drift (SST) to match dimension in illustration.
3. Install in the reverse order of removal.

Scheme 60

Scheme 61

Scheme 62

1. Remove the following parts: Engine undercover Drive belt; Refer to «DRIVE BELTS»(ref-159010-S14430122632005032300000) . Rear plate cover; Refer to «OIL PAN AND OIL STRAINER»(ref-159010-S01345083202005032300000) Cooling fan; Refer to «COOLING FAN»(ref-172473-S08022088772005022800000) .
2. Set the ring gear stopper (SST).
3. Remove crankshaft pulley with the following procedure: Loosen crankshaft pulley bolt. Pull crankshaft pulley with both hands to remove it. CAUTION: Do not remove fixing bolt. Keep loosened fixing bolt in place to protect removed crankshaft pulley from dropping. Do not remove balance weight (inner hexagon bolt) at the front of crankshaft pulley.
4. Remove front oil seal using a suitable tool. CAUTION: Be careful not to damage front cover and oil pump drive spacer.

Scheme 63

Scheme 64

1. Install front oil seal onto front cover. Apply engine oil on new front oil seal. Install new front oil seal in the direction shown in the figure. CAUTION: Be careful not to scratch or make burrs on circumference of oil seal. Using the front oil seal drift (commercial service tool) or drift with 54 mm (2.13 in) diameter, force fit the seal until it levels with the front end surface of front cover.
2. Install in the reverse order of removal.

Scheme 65

1. Remove transmission assembly. Refer to «TRANSMISSION ASSEMBLY»(ref-170821-S42413579512005011800000) . Remove drive plate. Holding crankshaft pulley mounting bolts, lock crankshaft to remove bolts fixing drive plate. Loosen fixing bolts diagonally. CAUTION: Be careful not to damage drive plate. Especially, avoid deforming and damaging of signal plate teeth (circumference position). Place the drive plate with signal plate surface facing other than downward. Keep magnetic materials away from signal plate. Remove engine rear plate.
2. Remove rear oil seal using a suitable tool. CAUTION: Be careful not to damage crankshaft and oil seal retainer surface.

Scheme 66

Scheme 67

1. Install rear oil seal using the rear oil seal drift (commercial service tool). Apply engine oil on new rear oil seal. Install new oil seal in the direction shown in the figure. CAUTION: Be careful not to scratch or make burrs on circumference of rear oil seal. Tap until flattened with front edge of oil seal retainer. Do not damage or scratch outer circumference of oil seal.
2. Install in the reverse order of removal.

Scheme 68

Scheme 69

Scheme 70

1. Warm up engine thoroughly. Then, stop it.
2. Remove engine cover (with power tool). Refer to «REMOVAL AND INSTALLATION»(ref-159010-S38119701512005032300000) .
3. Release fuel pressure. Remove fuel pump fuse, and start engine. Refer to «FUEL PRESSURE RELEASE»(ref-173766-S34645699222005032200000) for fuel pump fuse location. After engine stalls, crank it two or three times to release all fuel pressure. Let fuel pump fuse removed until the end of step 7.
4. Remove ignition coil and spark plug from each cylinder. Refer to «REMOVAL AND INSTALLATION»(ref-159010-S25475195982005032300000) and «SPARK PLUG (PLATINUM-TIPPED TYPE)»(ref-159010-S12328576682005032300000) .
5. Connect engine tachometer (not required in use of CONSULT-II).
6. Install compression gauge with adapter (SST or commercial service tool) onto spark plug hole. Use compression gauge adapter (SST) which is required on No. 7 and No. 8 cylinders. Use the compression gauge adapter (if SST is not used) which picking up end inserted to spark plug hole is smaller than 20 mm (0.79 in) in diameter. Otherwise, it may be caught by cylinder head during removal.
7. With accelerator pedal fully depressed, turn ignition switch to "START" for cranking. When the gauge pointer stabilizes, read the compression pressure and engine RPM. Perform these steps to check each cylinder. Compression pressure CAUTION: Always use a fully charged battery to obtain specified engine speed. If the engine speed is out of specified range, check battery liquid for proper gravity. Check engine speed again with normal battery gravity. If compression pressure is below minimum value, check valve clearances and parts associated with combustion chamber (Valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head gasket). After the checking, measure compression pressure again. If some cylinders have low compression pressure, pour small amount of engine oil into the spark plug hole of the cylinder to re-check it for compression. If the added engine oil improves the compression, the piston rings may be worn out or damaged. Check the piston rings and replace if necessary. If the compression pressure remains at low level despite the addition of engine oil, the valves may be malfunctioning. Check the valves for damage. Replace the valve or valve seat accordingly. If two adjacent cylinders have respectively low compression pressure and their compression remains low even after the addition of engine oil, the gaskets are leaking. In such a case, replace the cylinder head gaskets.
8. Install removed parts in the reverse order of removal.
9. Start engine, and confirm that engine runs smoothly.
10. Perform trouble diagnosis. If DTC appears, erase it. Refer to «TROUBLE DIAGNOSIS»(ref-173766-S07927039132005032200000) .

Scheme 71

Scheme 72

1. Remove engine assembly from vehicle. Refer to «REMOVAL AND INSTALLATION»(ref-159010-S32061018882005032300000) .
2. Remove the following components and related parts: Auto tensioner of drive belts and idler pulley. Refer to «DRIVE BELT AUTO TENSIONER AND IDLER PULLEY»(ref-159010-S18606836252005032300000) . Thermostat housing and hose. Refer to «REMOVAL AND INSTALLATION»(ref-172473-S12237633662005022800000) . Oil pan and oil strainer. Refer to «REMOVAL AND INSTALLATION»(ref-159010-S02388737412005032300000) . Intake manifold upper and intake manifold lower. Refer to «REMOVAL AND INSTALLATION»(ref-159010-S05117784122005032300000) . Fuel damper and fuel hose assembly, fuel tube (right and left) and fuel injector. Refer to «REMOVAL AND INSTALLATION»(ref-159010-S41367070862005032300000) . Ignition coil. Refer to «REMOVAL AND INSTALLATION»(ref-159010-S25475195982005032300000) . Rocker cover. Refer to «REMOVAL AND INSTALLATION»(ref-159010-S40213109212005032300000) .
3. Remove crankshaft pulley, front cover, oil pump, and timing chain. Refer to «REMOVAL AND INSTALLATION»(ref-159010-S39200003652005032300000) .
4. Remove camshaft sprockets and camshafts. Refer to «REMOVAL AND INSTALLATION»(ref-159010-S14473536642005032300000) .
5. Remove cylinder head loosening bolts in reverse order shown in the figure and using the cylinder head bolt wrench (commercial service tool).
6. Remove cylinder head gaskets.

Scheme 73

1. Cylinder head bolts are tightened by plastic zone tightening method. Whenever the size difference between d1 and d2 exceeds the limit, replace them with new one. Limit (d1 - d2): More than 0.18 mm (0.0071 in)
2. If reduction of outer diameter appears in a position other than d2, use it as d2 point.