Infiniti EX35. Manual - part 728

CYLINDER HEAD

EM-111

< DISASSEMBLY AND ASSEMBLY >

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a.

Remove old locking sealant adhering to cylinder head mounting hole.

b.

Apply sealant to area within approximately 12 mm (0.47 in) from edge of spark plug tube press-fit side.
Use Genuine high strength thread locking sealant or equivalent. Refer to 

GI-15, "Recommended

Chemical Products and Sealants"

.

c.

Using drift, press-fit spark plug tube so that its height (A) is as
specified in the figure.

CAUTION:

• When press-fitting, take care not to deform spark plug

tube.

• After press-fitting, wipe off liquid gasket protruding onto cylinder-head upper face.

15. Install spark plug with spark plug wrench (commercial service tool).

16. Install in the reverse order of removal after this step.

Inspection

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INSPECTION AFTER REMOVAL

Cylinder Head Bolts Outer Diameter

• Cylinder head bolts are tightened by plastic zone tightening

method. Whenever the size difference between (C) and (B)
exceeds the limit, replace them with new one. 

• If reduction of outer diameter appears in a position other than (B),

use it as (B) point.

Cylinder Head Distortion

NOTE:
When performing this inspection, cylinder block distortion should be also checking. Refer to 

EM-144,

"Cylinder Block"

.

1.

Using a scraper, wipe off oil, scale, gasket, sealant and carbon deposits from surface of cylinder head.

CAUTION:

Never 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 (A, B, C, D, E, and F).

• If it exceeds the limit, replace cylinder head.

INSPECTION AFTER DISASSEMBLY

Valve Dimensions

B

: High strength thread locking sealant application 
area

Standard press-fit height:

: 37.7 - 38.7 mm (1.484 - 1.524 in)

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Limit [(C) - (B)]

: 0.18 mm (0.0071 in)

A

: Measuring point

e

: 48 mm (1.89 in)

d

: 11 mm (0.43 in)

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Limit

: Refer to 

EM-142, "Cylinder Head"

.

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< DISASSEMBLY AND ASSEMBLY >

CYLINDER HEAD

• Check the dimensions of each valve. For the dimensions, refer to 

EM-142, "Cylinder Head"

.

• If dimensions are out of the standard, replace valve and check valve seat contact. Refer to "VALVE SEAT

CONTACT".

Valve Guide Clearance

Valve Stem Diameter

• Measure the diameter of valve stem with micrometer (A).

Valve Guide Inner Diameter

• Measure the inner diameter of valve guide with bore gauge.

Valve Guide Clearance

• (Valve guide clearance) = (Valve guide inner diameter) – (Valve stem diameter)

• If the calculated value exceeds the limit, replace valve and/or valve guide. When valve guide must be

replaced, refer to 

EM-104, "Disassembly and Assembly"

.

Valve Seat Contact

• After confirming that the dimensions of valve guides and valves are within the specifications, perform this

procedure.

• Apply prussian blue (or white lead) onto contacting surface of valve seat to check the condition of the valve

contact on the surface.

• Check if the contact area band is continuous all around the circumference.
• If not, grind to adjust valve fitting and check again. If the contacting

surface still has “NG” (B) conditions even after the recheck,
replace valve seat. Refer to 

EM-104, "Disassembly and Assem-

bly"

.

Valve Spring Squareness

• Set a try square (A) along the side of valve spring and rotate

spring. Measure the maximum clearance between the top of spring
and try square.

• If it exceeds the limit, replace valve spring.

Valve Spring Dimensions and Valve Spring Pressure Load

Standard 

: Refer to 

EM-142, 

"Cylinder Head"

.

(Intake and exhaust)

Standard

: Refer to 

EM-142, 

"Cylinder Head"

.

(Intake and exhaust)

Valve guide clearance

: Refer to 

EM-142, "Cylinder Head"

.

Standard and limit (Intake and exhaust)

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A

:  OK

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B

: Contact

Limit

: Refer to 

EM-142, "Cylinder Head"

.

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CYLINDER HEAD

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• Check the valve spring pressure at specified spring height.

• If the installation load or load with valve open is out of the stan-

dard, replace valve spring.

INSPECTION AFTER INSTALLATION

Inspection for Leakage

The following are procedures for checking fluids leakage, lubricates leakage and exhaust gases leakage.

• 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-10, "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 leak-

age 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 check 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.

Summary of the inspection items:

*: Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.

Standard (Intake and exhaust)

: Refer to 

EM-142, 

"Cylinder Head"

.

Free height

Installation height

Installation load

Height during valve open

Load with valve open

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Items

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

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Leakage

—

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CYLINDER BLOCK

CYLINDER BLOCK

Exploded View

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1.

Sub harness

2.

Knock sensor

3.

Crankshaft position sensor

4.

Cylinder block heater (for Canada)

5.

Cylinder block 

6.

Thrust bearing

7.

Main bearing (upper)

8.

Crankshaft

9.

Crankshaft key

10. Main bearing (lower)

11. O-ring

12. Lower cylinder block bolt

13. Baffle plate

14. Lower cylinder block

15. Pilot converter

16. Reinforcement plate

17. Drive plate

18. Rear oil seal

19. Oil jet

20. Top ring

21. Second ring

22. Oil ring

23. Piston

24. Piston pin

25. Snap ring

26. Connecting rod

27. Connecting rod bearing

28. Connecting rod bearing cap

29. Connecting rod bolt

A.

Refer to 

EM-115

B.

Chamfered

C.

Front mark

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