Nissan Frontier D40. Manual - part 617

 

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Nissan Frontier D40. Manual - part 617

 

 

EM-200

< ON-VEHICLE REPAIR >

[VQ40DE]

CYLINDER HEAD

6.

Remove cylinder head bolts in reverse order as shown using
suitable tool and power tool to remove cylinder heads (right and
left banks).

7.

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 the bolt with a 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 checked. Refer to 

EM-225, "Inspec-

tion After Disassembly"

.

1.

Using suitable tool, 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

PBIC2057E

Limit [(d1) - (d2)]

: 0.11 mm (0.0043 in)

PBIC2480E

Limit

: 0.1 mm (0.004 in)

SEM861E

CYLINDER HEAD

EM-201

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1.

Install new cylinder head gasket.

2.

Turn crankshaft until No. 1 piston is set at TDC.
• Crankshaft key should line up with the right bank cylinder cen-

ter line as shown.

3.

Install cylinder head follow the steps below to tighten cylinder
head bolts in numerical order as shown.

CAUTION:

If cylinder head bolts re-used, check their outer diameters
before installation. Refer to 

EM-199, "Removal and Installa-

tion"

 (Cylinder Head Bolts Outer Diameter).

Measure the tightening angle using Tool.

SEM532G

Step a

: 98 N·m (10 kg-m, 72 ft-lb) 

Step b

: Loosen to 0 N·m in the reverse order of tight-
ening.

Step c

: 39.2 N·m (4.0 kg-m, 29 ft-lb)

PBIC2057E

Tool number

: KV10112100 (BT-8653-A)

Step d

: 90

°

 clockwise

Step e

: 90

°

 clockwise

WBIA0581E

EM-202

< ON-VEHICLE REPAIR >

[VQ40DE]

CYLINDER HEAD

4.

After installing cylinder head, measure distance between front
end faces of cylinder block and cylinder head (left and right
banks).

• If the measured value is out of the standard, re-install cylinder

head.

5.

Installation of the remaining parts is in the reverse order of removal.

INSPECTION AFTER INSTALLATION

• Before starting the engine, check oil/fluid levels including engine coolant and engine oil. If the levels are

lower than required quantity, fill to the specified level. Refer to 

MA-16, "For North America: Fluids and Lubri-

cants"

.

• Use procedure below to check for fuel leakage.
• Turn ignition switch ON (with engine stopped). With fuel pressure applied to the fuel piping, check for fuel

leakage at the 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.

NOTE:
If hydraulic pressure inside timing chain tensioner drops after removal and installation, slack in the guide
may generate a pounding noise during and just after engine start. However, this is normal. Noise will stop
after hydraulic pressure rises.

• Warm up engine thoroughly to make sure there is no leakage of fuel, exhaust gas, or any oil/fluids including

engine oil and engine coolant.

• Bleed air from passages in lines and hoses, such as in cooling system.
• After cooling down the engine, again check oil/fluid levels including engine oil and engine coolant. Refill to

specified level if necessary.

• Summary of the inspection items:

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

Standard

: 14.1 - 14.9 mm (0.555 - 0.587 in) 

EMQ0662D

Item

Before starting engine

Engine running

After engine stopped

Engine coolant

Level

Leakage

Level

Engine oil

Level

Leakage

Level

Other oils and fluids*

Level

Leakage

Level

Fuel

Leakage

Leakage

Leakage

Exhaust gas

Leakage

CYLINDER HEAD

EM-203

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Exploded View

INFOID:0000000005274353

Disassembly and Assembly

INFOID:0000000005274354

DISASSEMBLY

1.

Remove spark plug.

2.

Remove valve lifter.
• Identify installation positions, and store them without mixing them up.

3.

Remove valve collet.
• Compress valve spring and remove valve collet with magnet

hand using Tool.

CAUTION:

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

4.

Remove valve spring retainer, valve spring and valve spring seat.

5.

Push valve stem to combustion chamber side, and remove valve.
• Identify installation positions, and store them without mixing them up.

1.

Valve lifter

2.

Valve collet

3.

Valve spring retainer

4.

Valve spring

5.

Valve oil seal

6.

Valve spring seat

7.

Valve guide

8.

Spark plug

9.

Spark plug tube

10. Cylinder head (right bank)

11.

Valve seat

12. Valve (EXH)

13.  Valve (INT)

14. Cylinder head (left bank)

PBIC2637E

Tool numbers

: KV10109220 (

)

: KV10116200 (J-26336-B)

: KV10115900 (J-26336-20)

WBIA0578E

 

 

 

 

 

 

 

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