engine INFINITI M35 2006 Factory Service Manual

CYLINDER HEAD
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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

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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
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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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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

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Identify installation positions, and store them without mixing them up.
6. Remove valve oil seal with valve oil seal puller (SST).
7. If valve seat must be replaced, refer to EM-242, "
VALVE SEAT REPLACEMENT" .
8. If valve guide must be replaced, refer to EM-240, "
VALVE GUIDE REPLACEMENT" .
9. Remove spark plug tube, as necessary.
Using pair of pliers, pull spark plug tube out of cylinder head.
CAUTION:
Take care not to damage cylinder head.
Once removed, spark plug tube will be deformed and cannot be reused. Do not remove it unless
absolutely necessary.
ASSEMBLY
1. When valve guide is removed, install it. Refer to EM-240, "VALVE GUIDE REPLACEMENT" .
2. When valve seat is removed, install it. Refer to EM-242, "
VALVE SEAT REPLACEMENT" .
3. Install new valve oil seal as follows:
a. Apply new engine oil on valve oil seal joint and seal lip.
b. Install with valve oil seal drift (SST) to match dimension in the
figure.
4. Install valve.
Install in the original position.
NOTE:
Larger diameter valves are for intake side.
5. Install valve spring (with valve spring seat).
Install smaller pitch (valve spring seat side) to cylinder head
side.
6. Install valve spring retainer.
PBIC0072E
PBIC0073E
PBIC0074E

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ENGINE ASSEMBLYPFP:10001
ComponentsNBS004PK
Removal and InstallationNBS004PL
WAR NING :
Situate vehicle on a flat and solid surface.
Place chocks at front and back of rear wheels.
For engines not equipped with engine slingers, attach proper slingers and bolts described in
PARTS CATALOG.
CAUTION:
Always be careful to work safely, avoid forceful or uninstructed operations.
Do not start working until exhaust system and engine coolant are cool enough.
If items or work required are not covered by the engine section, refer to the applicable sections.
1. Engine mounting bracket (RH) 2. Heat insulator 3. Engine mounting insulator (RH)
4. Engine mounting insulator (LH) 5. Heat insulator 6. Engine mounting bracket (LH)
7. Rear engine mounting member 8. Engine mounting insulator (rear)
A. Front mark
PBIC3304E

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Always use the support point specified for lifting.
Use either 2-pole lift type or separate type lift as best you can. If board-on type is used for
unavoidable reasons, support at the rear axle jacking point with transmission jack or similar tool
before starting work, in preparation for the backward shift of center of gravity.
For supporting points for lifting and jacking point at rear axle, refer to GI-42, "Garage Jack and
Safety Stand and 2-Pole Lift" .
REMOVAL
Outline
At first, remove engine, transmission assembly with front suspension member from vehicle downward. Then
separate engine from transmission.
Preparation
1. Release fuel pressure. Refer to EC-809, "FUEL PRESSURE RELEASE" .
2. Drain engine coolant from radiator. Refer to CO-40, "
Changing Engine Coolant" .
CAUTION:
Perform this step when engine is cold.
Do not spill engine coolant on drive belts.
3. Disconnect both battery cables. Refer to SC-4, "
BATTERY" .
4. Remove crankshaft position sensor (POS) from transmission.
CAUTION:
Handle carefully to avoid dropping and shocks.
Do not disassemble.
Do not allow metal powder to adhere to magnetic part at sensor tip.
Do not place sensors in a location where they are exposed to magnetism.
5. Remove the following parts:
Front and rear engine undercover (power tool)
Air duct (inlet), air duct and air cleaner case assembly; Refer to EM-177, "AIR CLEANER AND AIR
DUCT" .
Front road wheels and tires (power tool)
Engine Room LH
1. Disconnect heater hoses, and install plugs to avoid leakage of engine coolant.
2. Disconnect wire bonding from exhaust manifold cover to vehicle.
3. Disconnect vacuum hose between vehicle and engine and set it aside.
4. Discharge refrigerant from A/C circuit. Refer to ATC-151, "
REFRIGERANT LINES" .
5. Remove A/C piping from A/C compressor, and temporarily fasten it on vehicle with a rope. Refer to AT C -
151, "REFRIGERANT LINES" .
Engine Room RH
1. Disconnect fuel feed hose and EVAP hose. Refer to EM-193, "FUEL INJECTOR AND FUEL TUBE" .
CAUTION:
Fit plugs onto disconnected hose to prevent fuel leak.
2. Disconnect ground cable (between vehicle and right bank cylinder head).
3. Disconnect vacuum hose between vehicle and engine and set it aside.
4. Disconnect reservoir tank of power steering oil pump from engine, and move it aside for easier work.
CAUTION:
When temporarily securing, keep reservoir tank upright to avoid a fluid leak.
Ve h i c le i n s i d e
Follow procedure below to disconnect engine room harness connectors at passenger room side, and tempo-
rarily secure them on engine.
1. Remove passenger-side kicking plate, dash side finisher, and glove box. Refer to EI-37, "
BODY SIDE
TRIM" and IP-10, "INSTRUMENT PANEL ASSEMBLY" .
2. Disconnect engine room harness connectors at unit sides TCM, ECM and other.

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3. Disengage intermediate fixing point. Pull out engine room harnesses to engine room side, and temporarily
secure them on engine.
CAUTION:
When pulling out harnesses, take care not to damage harnesses and connectors.
After temporarily securing, cover connectors with vinyl or similar material to protect against for-
eign material adhesion.
Vehicle Underbody
1. Remove A/T fluid cooler hoses and power steering oil pump oil cooler hoses.
Install plug to avoid leakage of A/T fluid and power steering fluid.
2. Disconnect heated oxygen sensor 2 harness. Refer to EX-3, "
EXHAUST SYSTEM" .
3. Remove exhaust front tube with power tool. Refer to EX-3, "
EXHAUST SYSTEM" .
4. Disconnect steering lower joint at power steering gear assembly side, and release steering lower shaft.
Refer to PS-13, "
STEERING COLUMN" .
5. Separate steering outer sockets from steering knuckle. Refer to PS-18, "
POWER STEERING GEAR" .
6. Remove A/T control rod at control device assembly side. Then temporarily secure it on transmission, so
that it does not sag. Refer to AT-222, "
SHIFT CONTROL SYSTEM" .
7. Remove rear plate cover from oil pan. Then remove bolts fixing drive plate to torque converter. Refer to
EM-187, "
OIL PAN AND OIL STRAINER" and AT-271, "TRANSMISSION ASSEMBLY" .
8. Remove transmission joint bolts which pierce at oil pan lower rear side. Refer to AT- 2 7 1 , "
TRANSMIS-
SION ASSEMBLY" .
9. Remove lower ends of left and right strut from transverse link. Refer to FSU-6, "
FRONT SUSPENSION
ASSEMBLY" .
10. Remove transverse link mounting bolts at knuckle side. Refer to FSU-14, "
TRANSVERSE LINK" .
11. Remove front stabilizer at transverse link side. Refer to FSU-6, "
FRONT SUSPENSION ASSEMBLY" .
12. Remove rear propeller shaft. Refer to PR-6, "
REAR PROPELLER SHAFT" .
Removal Work
1. Use manual lift table caddy (commercial service tool) or equiva-
lently rigid tool such as transmission jack. Securely support bot-
tom of suspension member and transmission assembly.
CAUTION:
Put a piece of wood or something similar as the supporting
surface, secure a completely stable condition.
2. Remove engine rear member mounting bolts.
3. Remove front suspension member mounting nuts and bolts with power tool. Refer to FSU-6, "
FRONT
SUSPENSION ASSEMBLY" .
4. Carefully lower jack, or raise lift to remove engine, transmission and front suspension member assembly.
When performing work, observe the following caution:
CAUTION:
Confirm there is no interference with vehicle.
Make sure that all connection points have been disconnected.
Keep in mind the center of vehicle gravity changes. If necessary, use jack(s) to support vehicle
at rear jacking point(s) to prevent it from falling it off the lift.
PBIC0804E

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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

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Summary of the inspection items:
* Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc. Item Before starting engine Engine running After engine stopped
Engine coolant Level Leakage Level
Engine oil Level Leakage Level
Other oils and fluid* Level Leakage Level
Fuel Leakage Leakage Leakage
Exhaust gases — Leakage —