2006 INFINITI M35 check engine

CYLINDER HEAD
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Revision: 2006 January2006 M35/M45
CYLINDER HEADPFP:11041
On-Vehicle ServiceNBS004PF
CHECKING COMPRESSION PRESSURE
1. Warm up engine thoroughly. Then, stop it.
2. Release fuel pressure. Refer to EC-809, "
FUEL PRESSURE RELEASE" .
a. Remove fuel pump fuse to avoid fuel injection during measure-
ment.
3. Remove engine cover with power tool. Refer to EM-173, "
ENGINE ROOM COVER" .
4. Remove ignition coil and spark plug from each cylinder. Refer to EM-190, "
IGNITION COIL" and EM-191,
"SPARK PLUG (PLATINUM-TIPPED TYPE)" .
5. Connect engine tachometer (not required in use of CONSULT-II).
6. Install compression gauge with adapter (SST or commercial ser-
vice tool) onto spark plug hole.
Use compression gauge adapter (SST) which is required on
No. 7 and 8 cylinders.
Use compression gauge adapter (if no SST is used) whose
picking up end inserted to spark plug hole is smaller than 20
mm (0.79 in) in diameter. Otherwise, it may be caught by cyl-
inder 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 cyl-
inder.
Compression pressure:
Unit: kPa (kg/cm2 , psi) /rpm
CAUTION:
Always use a fully changed battery to obtain the specified engine speed.
PBIB1482E
PBIC1554E
SBIA0533E
Standard Minimum Deferential limit between cylinders
1,320 (13.5, 191) / 300 1,130 (11.5, 164) / 300 98 (1.0, 14) / 300

EM-234
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CYLINDER HEAD
Revision: 2006 January2006 M35/M45
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, 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, valves may be mal-
functioning. Check valves for damage. Replace 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, cylinder head gaskets are leaking. In such a case, replace cyl-
inder head gaskets.
8. After inspection is completed, install removed parts in the reverse order of removal.
9. Start engine, and make sure that engine runs smoothly.
10. Perform trouble diagnosis. If DTC appears, erase it. Refer to EC-811, "
TROUBLE DIAGNOSIS" .
ComponentsNBS004PG
Removal and InstallationNBS004PH
REMOVAL
1. Remove engine assembly from vehicle. Refer to EM-244, "ENGINE ASSEMBLY" .
2. Remove exhaust manifold. Refer to EM-183, "
EXHAUST MANIFOLD AND THREE WAY CATALYST" .
3. Remove camshaft. Refer to EM-215, "
CAMSHAFT" .
1. Engine coolant temperature sensor 2. Washer 3. Cylinder head gasket (left bank)
4. Harness bracket 5. Cylinder head (right bank) 6. Cylinder head bolt
7. Cylinder head gasket (right bank) 8. Cylinder head bolt 9. Cylinder head (left bank)
PBIC2756E

CYLINDER HEAD
EM-235
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Revision: 2006 January2006 M35/M45
4. Remove cylinder head bolts in reverse order as shown in the fig-
ure with cylinder head bolt wrench (commercial service tool) to
remove cylinder heads (right and left banks).
5. Remove cylinder head gaskets.
INSPECTION AFTER REMOVAL
Cylinder Head Bolts Outer Diameter
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.
If reduction of outer diameter appears in a position other than
“d2”, use it as “d2” point.
Cylinder Head Distortion
NOTE:
When performing this inspection, cylinder block distortion should be also checking. Refer to EM-269, "
CYLIN-
DER BLOCK DISTORTION" .
1. Using scraper, wipe off oil, scale, gasket, sealant and carbon deposits from surface of cylinder head.
CAUTION:
Do not allow gasket fragments to enter engine oil or engine coolant passages.
2. At each of several locations on bottom surface of cylinder head,
measure the distortion in six directions.
If it exceeds the limit, replace cylinder head.
INSTALLATION
1. Install new cylinder head gasket.
2. Turn crankshaft until No. 1 piston is set at TDC.
PBIC0068E
Limit (“d1” – “d2”) : 0.18 mm (0.0071 in)
PBIC2361E
Limit : 0.1 mm (0.004 in)
PBIC0075E

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CYLINDER HEAD
Revision: 2006 January2006 M35/M45
Crankshaft key should line up with the left bank cylinder cen-
ter line as shown in the figure.
3. Install cylinder head follow the steps below to tighten cylinder
head bolts in numerical order as shown in the figure with cylin-
der head bolt wrench (commercial service tool).
CAUTION:
If cylinder head bolts are re-used, check their outer diame-
ters before installation. Refer to EM-235, "
Cylinder Head
Bolts Outer Diameter" .
a. Apply new engine oil to threads and seating surface of cylinder
head bolts.
b. Tighten all cylinder head bolts.
c. Completely loosen all cylinder head bolts.
CAUTION:
In step “c”, loosen cylinder head bolts in reverse order of that indicated in the figure.
d. Tighten all cylinder head bolts.
e. Turn all cylinder head bolts 60 degrees clockwise. (Angle tight-
ening)
CAUTION:
Check the tightening angle by using angle wrench (SST).
Avoid judgment by visual inspection without SST.
Check tightening angle indicated on angle wrench indicator
plate.
f. Turn all cylinder head bolts 60 degrees clockwise again. (Angle
tightening)
4. Install in the reverse order of removal.
PBIC2389E
: 98.1 Nꞏm (10 kg-m, 72 ft-lb)
: 0 Nꞏm (0 kg-m, 0 ft-lb)
: 44 Nꞏm (4.5 kg-m, 33 ft-lb)
PBIC0068E
PBIC0069E

ENGINE ASSEMBLY
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Revision: 2006 January2006 M35/M45
Separation Work
1. Install engine slingers into front of cylinder head (left bank) and
rear of cylinder head (right bank).
2. Remove engine mounting insulators (RH and LH) under side nut with power tool.
3. Lift with hoist and separate engine and transmission assembly from front suspension member.
CAUTION:
Avoid damage to and oil/grease smearing or spills onto engine mounting insulator.
4. Remove alternator. Refer to SC-23, "
CHARGING SYSTEM" .
5. Remove starter motor. Refer to SC-10, "
STARTING SYSTEM" .
6. Separate engine from transmission assembly. Refer to AT-271, "
TRANSMISSION ASSEMBLY" .
7. Remove engine mounting insulators (RH and LH) and brackets (RH and LH) from engine with power tool.
8. Remove rear engine mounting member and engine mounting insulator (rear) from transmission.
INSTALLATION
Note the following, and install in the reverse order of removal.
Do not allow engine mounting insulator to be damage and careful no engine oil gets on it.
For a location with a positioning pin, insert it securely into hole of mating part.
For a part with a specified installation orientation, refer to component figure in EM-244, "Components" .
When installing engine mounting brackets (RH and LH) on cylin-
der block, tighten two upper bolts (shown as “A” in the figure)
first. Then tighten two lower bolts (shown as “B” in the figure).
NOTE:
Figure shows LH bank.
INSPECTION AFTER INSTALLATION
Inspection for Leaks
The following are procedure for checking fluids leak, lubricates leak and exhaust gases leak.
Before starting engine, check oil/fluid levels including engine coolant and engine oil. If less than required
quantity, fill to the specified level. Refer to MA-12, "
RECOMMENDED FLUIDS AND LUBRICANTS" .
Use procedure below to check for fuel leakage.
–Turn ignition switch “ON” (with engine stopped). With fuel pressure applied to fuel piping, check for fuel
leakage at connection points.
–Start engine. With engine speed increased, check again for fuel leakage at connection points.
Run engine to check for unusual noise and vibration.
Warm up engine thoroughly to make sure there is no leakage of fuel, exhaust gases, or any oil/fluids
including engine oil and engine coolant.
Bleed air from lines and hoses of applicable lines, such as in cooling system.
After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill to the
specified level, if necessary.Slinger bolts:
:33.4 Nꞏm (3.4 kg-m, 25 ft-lb)
PBIC2447E
PBIC3305E

CYLINDER BLOCK
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Revision: 2006 January2006 M35/M45
–Fuel tube and fuel injector assembly; Refer to EM-193, "FUEL INJECTOR AND FUEL TUBE" .
–Ignition coil; Refer to EM-190, "IGNITION COIL" .
–Rocker cover; Refer to EM-199, "ROCKER COVER" .
–Other removable brackets
NOTE:
The figure shows an example of widely use engine stand that
can hold mating surface of transmission with drive plate and rear
plate removed.
CAUTION:
Before removing the hanging chains, make sure the engine
stand is stable and there is no risk of overturning.
4. Drain engine oil. Refer to LU-28, "
Changing Engine Oil" .
5. Drain engine coolant from inside engine by removing water
drain plugs “B” as shown in the figure.
6. Remove oil pan and oil strainer; Refer to EM-187, "
OIL PAN AND OIL STRAINER" .
7. Remove crankshaft pulley as follows:
a. Lock crankshaft with a hammer handle or similar tool to loosen
crankshaft bolt.
b. Pull crankshaft pulley with both hands to remove it.
CAUTION:
Do not remove crankshaft pulley bolt. Keep loosened
crankshaft pulley bolt in place to protect removed crank-
shaft pulley from dropping.
Do not remove balance weight (inner hexagon bolt) at the
front of crankshaft pulley.
8. Remove the following parts and related parts (The parts listed in step 3 are not included here.)
Front cover and timing chain; Refer to EM-203, "TIMING CHAIN" .
Camshaft; Refer to EM-215, "CAMSHAFT" .
Cylinder head; Refer to EM-233, "CYLINDER HEAD" .
9. Remove knock sensor.
CAUTION:
Carefully handle sensor, avoiding shocks.
10. Remove piston and connecting rod assembly as follows:
Before removing piston and connecting rod assembly, check the connecting rod side clearance. Refer
to EM-266, "
CONNECTING ROD SIDE CLEARANCE" .
a. Position crankshaft pin corresponding to connecting rod to be removed onto the bottom dead center.
b. Remove connecting rod bearing cap.
PBIC0085E
PBIC1265E
PBIC0053E

EM-256
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CYLINDER BLOCK
Revision: 2006 January2006 M35/M45
7. Install each main bearing cap bolt as follows:
a. Apply new engine oil to threads and seating surface of main
bearing cap bolts, and tighten all bolts temporarily.
b. Tighten main bearing cap bolt (M12) in order of 1 to 10.
c. Tighten main bearing cap sub bolt (M9) in order of 11 to 20.
d. Tighten main bearing cap bolt (M12) to 40 degrees clockwise in
order of 1 to 10. (Angle tightening)
CAUTION:
Use angle wrench (SST) to check tightening angle in step
“d” and “e”. Do not make judgment by visual inspection.
e. Tighten main bearing cap sub bolt (M9) to 30 degrees clockwise
in order of 11 to 20. (Angle tightening)
f. Tighten side bolt (M10) in order of 21 to 30.
After installing main bearing cap bolts, make sure that crankshaft can be rotated smoothly.
Check the crankshaft end play. Refer to EM-266, "CRANKSHAFT END PLAY" .
g. Install cover of cylinder block rear left side (next to the starter motor housing).
8. Install new rear oil seal on rear oil seal retainer.
Install new rear oil seal so that each seal lip is oriented as
shown in the figure.
Install rear oil seal to rear oil seal retainer with rear oil seal
drift (commercial service tool).
Tap until flattened with front edge of rear oil seal retainer. Do
not damage or scratch outer circumference of oil seal.
Make sure the garter spring is in position and seal lips not
inverted.
9. Install rear oil seal retainer.
Apply new engine oil to both oil seal lip and dust seal lip.: 39.2 Nꞏm (4.0 kg-m, 29 ft-lb)
: 29.4 Nꞏm (3.0 kg-m, 22 ft-lb)
PBIC0090E
PBIC0096E
: 49 Nꞏm (5.0 kg-m, 36 ft-lb)
SEM715A
Rear oil seal drift
Outer diameter : 102 mm (4.02 in)
Inner diameter : 86 mm (3.39 in)
PBIC0097E

EM-258
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CYLINDER BLOCK
Revision: 2006 January2006 M35/M45
When installing, align the connecting rod bearing stopper pro-
trusion with the cutout of connecting rod and connecting rod
bearing cap to install.
Ensure the oil holes on connecting rod and that on the corre-
sponding bearing are aligned.
13. Install piston and connecting rod assembly to crankshaft.
Position the crankshaft pin corresponding to connecting rod to be installed onto the bottom dead center.
Apply engine oil sufficiently to the cylinder bore, piston and crankshaft pin journal.
Match the cylinder position with the cylinder No. on connecting rod to install.
Be sure that front mark on piston head is facing front of engine.
Using piston ring compressor [SST: EM03470000 (J8037)],
install piston with the front mark on the piston head facing the
front of engine.
CAUTION:
Be careful not to damage cylinder wall and crankshaft pin,
resulting from an interference of the connecting rod big
end.
14. Install connecting rod bearing cap.
Match the stamped cylinder number marks on connecting rod
with those on cap to install.
15. Tighten connecting rod nuts as follows:
a. Apply new engine oil to the threads and seats of connecting rod bolts and nuts.
b. Tighten connecting rod nuts.
c. Then tighten all connecting rod nuts 60 degrees clockwise.
(Angle tightening)
CAUTION:
Use angle wrench (SST) to check tightening angle. Do not
make judgment by visual inspection.
After tightening connecting rod nuts, make sure that crank-
shaft rotates smoothly.
Check the connecting rod side clearance. Refer to EM-266,
"CONNECTING ROD SIDE CLEARANCE" .
PBIC2370E
PBIC0102E
PBIC2164E
: 14.7 Nꞏm (1.5 kg-m, 11 ft-lb)
PBIC0104E