Infiniti F50. Manual - part 544

 

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Infiniti F50. Manual - part 544

 

 

CYLINDER HEAD

EM-63

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5.

Remove cylinder head loosening bolts in reverse order shown in
the figure and using cylinder head bolt wrench (Commercial ser-
vice tool). 

INSPECTION AFTER REMOVAL
Outer Diameter of Cylinder Head Bolts

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.

INSTALLATION

1.

Install cylinder head gasket.

2.

Follow the steps below to tighten fixing bolts in the order shown
in figure to install cylinder head.

CAUTION:

If cylinder head bolts are re-used, check their outer diam-
eters before installation. Refer to above 

EM-63, "Outer

Diameter of Cylinder Head Bolts"

 .

In step “c”, loosen bolts in the reverse order of that indi-
cated in figure.

a.

Apply engine oil to threads and seating surface of bolts.

b.

Tighten all bolts to 98.1 N·m (10 kg-m, 72 ft-lb).

c.

Completely loosen all bolts.

d.

Tighten all bolts to 39.2 to 49.0 N·m (4.0 to 5.0 kg-m, 29 to 36 ft-lb).

e.

Turn all bolts 60 to 65 (target: 60) degrees clockwise.

f.

Turn all bolts 60 to 65 (target: 60) degrees clockwise again.

CAUTION:

Check and confirm the tightening angle by using angle
wrench (SST) and cylinder head bolt wrench (commercial
service tool). Avoid judgment by visual inspection without
the SST.

3.

Install followings in reverse order of removal. 

PBIC0068E

Limit (d1 - d2)

: More than 0.18 mm (0.0071 in)

KBIA0189E

PBIC0068E

PBIC0069E

EM-64

CYLINDER HEAD

Disassembly and Assembly

EBS002MT

DISASSEMBLY

1.

Remove spark plug with spark plug wrench.

2.

Remove spark plug tube, as necessary.

Using a pair of pliers, pull spark plug tube out of cylinder head. 

CAUTION:

Take care not to damage cylinder head.

Once spark plug tube is removed,  it will be deformed and cannot be reused. Do not remove it
unless absolutely necessary.

3.

Remove adjusting shim and valve lifter.

Confirm installation point. Keep parts in an organized way ti avoid.

4.

Remove valve collet. 

Compress valve spring with valve spring compressor.
Remove valve collet with magnet driver.

5.

Remove valve spring retainer and valve spring.

CAUTION:

Do not remove valve spring seat from valve spring.

6.

Push valve stem to combustion chamber side, and remove
valve. 

Inspect valve guide clearance before removal. Refer to 

EM-

66, "VALVE GUIDE CLEARANCE"

 .

SBIA0390E

1.

Spark plug

2.

Adjusting shim

3.

Valve lifter

4.

Valve collet

5.

Valve spring retainer

6.

Valve spring (with valve spring seat)

7.

Valve oil seal

8.

Valve guide

9.

Valve seat (INT)

10.

Valve (INT)

11.

Valve (EXH)

12.

Valve seat (EXH)

13.

Cylinder head (left bank)

14.

Cylinder head (right bank)

PBIC0071E

CYLINDER HEAD

EM-65

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Confirm installation point. Keep parts in an organized way ti avoid.

7.

Remove valve oil seal with valve oil seal puller.

8.

When valve seat must be replaced, refer to 

EM-68, "VALVE

SEAT REPLACEMENT"

 .

9.

When valve guide must be replaced, refer to 

EM-66, "VALVE

GUIDE REPLACEMENT"

 .

ASSEMBLY

1.

Install valve guide. Refer to 

EM-66, "VALVE GUIDE REPLACEMENT"

 .

2.

Install valve seat. Refer to 

EM-68, "VALVE SEAT REPLACEMENT"

 .

3.

Install valve oil seal.

Install with valve oil seal drift to match dimension in illustra-
tion.

4.

Install valve.

Install larger diameter to intake side.

5.

Install valve spring.

Install smaller pitch (valve spring seat side) to cylinder head
side.

6.

Install valve spring retainer.

7.

Install valve collet.

Compress valve spring with valve spring compressor. Install
valve collet with magnet hand.

Tap stem edge lightly with plastic hammer after installation to
check its installed condition.

8.

Install valve lifter.

9.

Install spark plug tube.

Press-fit spark plug tube following procedure below.

a.

Remove old liquid gasket adhering to cylinder-head mounting
hole.

b.

Apply liquid gasket to area within approximately 12 mm (0.47 in)
from edge of spark plug tube press-fit side.

Use Genuine liquid gasket or equivalent. 

c.

Using a drift, press-fit spark plug tube so that its height “H” in the
figure is as specified.

CAUTION:

When press-fitting spark plug tube, take care not to deform it.

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

10. Install spark plug with spark plug wrench.

PBIC0072E

PBIC0073E

Standard press-fit height “H”:

38.4 - 39.4 mm (1.512 - 1.551 in)

PBIC0074E

KBIA1248E

EM-66

CYLINDER HEAD

Inspection After Disassembly

EBS003MN

CYLINDER HEAD DISTORTION

1.

Wipe off oil and remove water scale (like deposit), gasket,
sealer, carbon, etc. with scraper.

CAUTION:

Use utmost care not to allow liquid gasket debris to enter
passages for oil or water.

2.

At each of several locations on bottom surface of cylinder head,
measure distortion in six directions.

VALVE DIMENSIONS

Check dimensions of each valve. For dimensions, refer to 

EM-

98, "Valve Dimensions"

 .

VALVE GUIDE CLEARANCE

Perform this inspection before removing valve guide.
1.

Make sure that the valve stem diameter is within the specification.

2.

Push the valve out by approx. 15 mm (0.59 in) toward the combustion chamber side to measure the
valve's run-out volume (in the direction of dial gauge) with dial gauge.

3.

The half of the run-out volume accounts for the valve guide clearance.

VALVE GUIDE REPLACEMENT

When valve guide is removed, replace with oversized (0.2 mm, 0.008 in) valve guide.

1.

To remove valve guide, heat cylinder head to 110 to 130

°

C (230

to 266

°

F) by soaking in heated oil.

Limit

: 0.1mm (0.004 in)

PBIC0075E

SEM188A

Standard

Intake

: 0.020 - 0.046 mm (0.0008 - 0.0018 in)

Exhaust

: 0.030 - 0.056 mm (0.0012 - 0.0022 in)

PBIC0077E

SEM008A

 

 

 

 

 

 

 

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