Nissan Murano Z51. Manual - part 661

 

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Nissan Murano Z51. Manual - part 661

 

 

EM-116

< UNIT DISASSEMBLY AND ASSEMBLY >

CYLINDER HEAD

d.

Using the valve guide reamer (commercial service tool) (A),
apply reamer finish to valve guide.

2.

If valve seat is removed in step 7 (DISASSEMBLY), install it. 
Replace with oversize [0.5 mm (0.020 in)] valve seat.

a.

Ream cylinder head recess diameter (a) for service valve seat.

• Be sure to ream in circles concentric to valve guide center.

This will enable valve to fit correctly.

b.

Heat cylinder head to 110 to 130

°

C (230 to 266

°

F) by soaking in

heated oil (A).

c.

Provide valve seats cooled well with dry ice. Force fit valve seat into cylinder head.

WARNING:

Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.

CAUTION:

Avoid directly touching cold valve seats.

d.

Using the valve seat cutter set (commercial service tool) or valve
seat grinder, finish seat to the specified dimensions. Refer to

EM-148, "Cylinder Head"

.

CAUTION:

When using the valve seat cutter, firmly grip cutter handle
with both hands. Then, press on the contacting surface all
around the circumference to cut in a single drive. Improper
pressure on with cutter or cutting many different times may
result in stage valve seat. 

e.

Using compound, grind to adjust valve fitting. 

f.

Check again for normal contact. Refer to 

EM-118, "Inspection"

.

3.

Install new valve oil seals as follows:

Standard

: Refer to 

EM-148, 

"Cylinder Head"

.

(Intake and exhaust)

JPBIA0185ZZ

Oversize

: Refer to 

EM-148, 

"Cylinder Head"

.

(Intake and exhaust)

JPBIA0188ZZ

JPBIA0184ZZ

SEM934C

CYLINDER HEAD

EM-117

< UNIT DISASSEMBLY AND ASSEMBLY >

C

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F

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a.

Apply new engine oil on valve oil seal joint and seal lip.

b.

Install with the valve oil seal drift [SST: KV10115600 (J-38958)]
(A) press fit valve seal to height (b) shown in the figure.
NOTE:
Dimension: Height measured before valve spring seat installa-
tion.

4.

Install valve spring seat.

5.

Install valve.
• Install it in the original position.

NOTE:
Larger diameter valves are for intake side.

6.

Install valve spring (uneven pitch type).
• Install narrow pitch end (paint mark) to cylinder head side

(valve spring seat side).

7.

Install valve spring retainer.

8.

Install valve collet.
• Compress valve spring with the valve spring compressor [SST:

KV10116200 (J-26336-A)] (A), the attachment [SST:
KV10115900 (J-26336-20)] (C) and the adapter [SST:
KV10109220 ( — )] (B). Install valve collet with a magnet
hand.

CAUTION:

When working, take care not to damage valve lifter holes.

• Tap valve stem edge lightly with plastic hammer after installa-

tion to check its installed condition.

9.

Install valve lifter.
• Install it in the original position.

10. Install spark plug tube.

• Press-fit spark plug tube as follows:

a.

Remove old liquid gasket 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-18, "Recommended

Chemical Products and Sealants"

.

Intake and exhaust

: 14.3 - 14.9 mm (0.563 - 0.587 in)

JPBIA0178ZZ

A

: Wide pitch

B

: Narrow pitch

C

: Paint mark

: Cylinder head side

Paint mark color: Blue

JPBIA0179ZZ

JPBIA0180ZZ

EM-118

< UNIT DISASSEMBLY AND ASSEMBLY >

CYLINDER HEAD

c.

Using a 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.

11. Install spark plug with the spark plug wrench (commercial service tool).

Inspection

INFOID:0000000005515970

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-130, "Inspec-

tion"

.

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

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

EM-148, "Cylinder Head"

.

• If dimensions are out of the standard, replace valve and check valve seat contact. Refer to “Valve Seat Con-

tact”.

Valve Guide Clearance

Valve Stem Diameter

B

: Genuine high strength thread locking sealant application area

Standard press-fit height: 37.7 - 38.7 mm (1.484 - 1.524 in)

JPBIA0181ZZ

A

: Measuring point

d

: 11 mm (0.43 in)

e

: 48 mm (1.89 in)

Limit [(C) - (B)]

: 0.11 mm (0.0043 in)

JPBIA0173ZZ

Limit

: Refer to 

EM-148, "Cylinder Head"

.

JPBIA0176ZZ

CYLINDER HEAD

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< UNIT DISASSEMBLY AND ASSEMBLY >

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• 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-114, "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” conditions (B) even after the recheck,
replace valve seat. Refer to 

EM-114, "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-148, 

"Cylinder Head"

.

(Intake and exhaust)

Standard

: Refer to 

EM-148, 

"Cylinder Head"

.

(Intake and exhaust)

Valve guide clearance

: Refer to 

EM-148, "Cylinder Head"

.

Standard and limit (Intake and exhaust)

JPBIA0183ZZ

A

:  OK

JPBIA0187ZZ

B

:  Contact

Limit

: Refer to 

EM-148, "Cylinder Head"

.

JPBIA0189ZZ

 

 

 

 

 

 

 

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