Infiniti FX35 / FX45. Manual - part 677

OIL SEAL

EM-225

< SERVICE INFORMATION >

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• Using rear oil seal drift (commercial service tool), press fit until

the height of front oil seal is level with the mounting surface.

• Make sure the garter spring is in position and seal lips not

inverted.

CAUTION:

• Be careful not to damage crankshaft and rear oil seal

retainer.

• Press fit straight and avoid causing burrs or tilting oil seal.

3.

Install in the reverse order of removal.

Rear oil seal drift

Outer diameter

: 102 mm (4.02 in)

Inner diameter

: 86 mm (3.39 in)

SBIA0360E

EM-226

< SERVICE INFORMATION >

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CYLINDER HEAD

CYLINDER HEAD

On-Vehicle Service

INFOID:0000000001325796

CHECKING COMPRESSION PRESSURE

1.

Warm up engine thoroughly. Then, stop it.

2.

Release fuel pressure. Refer to 

EC-665, "Fuel Pressure Check"

.

a.

Remove fuel pump fuse to avoid fuel injection during measure-
ment.

3.

Remove engine cover with power tool. Refer to 

EM-169, "Component"

.

4.

Remove ignition coil and spark plug from each cylinder. Refer to 

EM-187, "Component"

 and 

EM-188,

"Component"

.

5.

Connect engine tachometer (not required in use of CONSULT-III).

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 cylin-
der 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/cm

2

, 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

CYLINDER HEAD

EM-227

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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-666, "Trouble Diagnosis Introduction"

.

Component

INFOID:0000000001325797

Removal and Installation

INFOID:0000000001325798

REMOVAL

1.

Remove engine assembly from vehicle. Refer to 

EM-237, "Component"

.

2.

Remove exhaust manifold. Refer to 

EM-179, "Component"

.

3.

Remove camshaft. Refer to 

EM-211, "Component"

.

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

EM-228

< SERVICE INFORMATION >

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CYLINDER HEAD

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-256, "Inspec-

tion After Disassembly"

.

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