Nissan Frontier. Manual - part 756

 

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Nissan Frontier. Manual - part 756

 

 

CYLINDER HEAD

EM-213

< REMOVAL AND INSTALLATION >

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4. Heat cylinder head to 110

° to 130°C (230° to 266°F) by soaking

in heated oil.

5. Press valve guide from camshaft side to the dimensions as

shown using suitable tool.

WARNING:

Cylinder head contains heat. When working, wear protec-

tive equipment to avoid getting burned.

6. Apply reamer finish to valve guide using suitable tool.

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 circum-

ference.

• If not, grind to adjust valve fitting and check again. If the contacting

surface still has “NG” conditions even after the re-check, replace

valve seat.

VALVE SEAT REPLACEMENT

When valve seat is removed, replace with oversized [0.5 mm (0.020 in)] valve seat.
1. Bore out old seat until it collapses. Boring should not continue beyond the bottom face of the seat recess

in cylinder head. Set the machine depth stop to ensure this. Refer to 

EM-247, "Standard and Limit"

.

CAUTION:

Prevent to scratch cylinder head by excessive boring.

SEM008A

Projection “L”

Intake and exhaust

: 12.6 - 12.8 mm (0.496 - 0.504 in)

SEM950E

Standard:

Intake and exhaust

: 6.000 - 6.018 mm (0.2362 - 0.2369 in)

SEM932C

SBIA0322E

EM-214

< REMOVAL AND INSTALLATION >

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CYLINDER HEAD

2. Ream cylinder head recess diameter for service valve seat.

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

This will enable valve to fit correctly.

3. Heat cylinder head to 110

° to 130°C (230° to 266°F) by soaking

in heated oil.

4. 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.

5. Finish seat to the specified dimensions using suitable tool. Refer

to 

EM-247, "Standard and Limit"

.

CAUTION:

When using 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 staged valve seat. 

6. Using compound, grind to adjust valve fitting. 
7. Check again for normal contact.

VALVE SPRING SQUARENESS

• Set try square along the side of valve spring and rotate spring.

Measure the maximum clearance between the top face of spring

and try square.

• If it exceeds the limit, replace valve spring.

VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD

Oversize [0.5 mm (0.020 in)]

Intake

: 38.500 - 38.516 mm (1.5157 - 1.5164 in)

Exhaust

: 32.700 - 32.716 mm (1.2874 - 1.2880 in)

SEM795A

SEM008A

SEM934C

Limit

: 2.1 mm (0.083 in)

PBIC0080E

CYLINDER HEAD

EM-215

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• Check valve spring pressure at the specified spring height.

• If the installation load or load with valve open is out of the standard, replace valve spring.

Standard:

Intake and exhaust

Free height

: 47.07 mm (1.8531 in)

Installation height

: 37.00 mm (1.4567 in)

Installation load

: 166 - 188 N (16.9 - 19.2 kg, 37 - 42 lb)

Height during valve open

: 27.20 mm (1.0709 in)

Load with valve open

: 373 - 421 N (38.0 - 42.9 kg, 84 - 95 lb)

SEM113

EM-216

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ENGINE ASSEMBLY

UNIT REMOVAL AND INSTALLATION

ENGINE ASSEMBLY

Exploded View

INFOID:0000000009478146

Removal and Installation

INFOID:0000000009478147

WARNING:

• 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.

1.

Rear engine mounting insulator 4WD 2. Rear engine mounting insulator 2WD 3. LH engine mounting bracket (upper)

4.

LH heat shield plate

5. LH engine mounting insulator

6. LH engine mounting bracket (lower)

7.

RH engine mounting bracket (lower)

8. RH engine mounting insulator

9. RH heat shield plate

10. RH engine mounting bracket (upper)

AWBIA0721GB

 

 

 

 

 

 

 

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