Nissan Frontier D40. Manual - part 583

EM-64

< ON-VEHICLE REPAIR >

[QR25DE]

CYLINDER HEAD

CYLINDER HEAD

Exploded View

INFOID:0000000005274290

Removal and Installation

INFOID:0000000005274291

REMOVAL

1.

Release fuel pressure. Refer to 

EC-454, "Fuel Pressure Check"

.

2.

Drain engine coolant. Refer to 

CO-12, "Changing Engine Coolant"

.

CAUTION:

• Perform this step when the engine is cold.
• Do not spill engine coolant on drive belt.

3.

Drain engine oil. Refer to 

LU-10, "Changing Engine Oil"

.

CAUTION:

• Perform this step when the engine is cold.
• Do not spill engine oil on drive belt.

4.

Remove intake manifold. Refer to 

EM-27

.

5.

Remove fuel injector and fuel tube assembly. Refer to 

EM-38

.

6.

Remove exhaust manifold and three way catalyst assembly. Refer to 

EM-30

.

7.

Remove water outlet. Refer to 

CO-28, "Removal and Installation"

.

8.

Remove heater outlet. Refer to 

CO-28, "Exploded View"

.

NOTE:
Can be removed and installed even when assembled with cylinder head.

9.

Remove front cover and timing chain. Refer to 

EM-44

.

10. Remove camshafts. Refer to 

EM-52

.

1.

Cylinder head assembly

2.

Cylinder head gasket

3.

Cylinder head bolt

A.

Refer to 

EM-64, "Removal and Installation"

WBIA0835E

CYLINDER HEAD

EM-65

< ON-VEHICLE REPAIR >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

11. Loosen cylinder head bolts in reverse order as shown using

power tool. 

12. Remove cylinder head.

13. Remove cylinder head gasket.

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 them 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 also be checked. Refer to 

EM-88, "Inspection

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

1.

Install new cylinder head gasket.

2.

Install cylinder head following 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. Follow the "Cylinder Head Bolts Outer
Diameter" procedure.
NOTE:
Apply new engine oil to threads and seating surfaces of mount-
ing bolts.

KBIA0058E

Limit [(d1)  (d2)]: 0.23 mm (0.0091 in)

WBIA0836E

Limit

: 0.1 mm (0.004 in)

PBIC0075E

KBIA0058E

EM-66

< ON-VEHICLE REPAIR >

[QR25DE]

CYLINDER HEAD

• Measure the tightening angle using Tool.

3.

Installation of the remaining parts is in 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.

Tool number

: KV10112100 (BT-8653-A)

Step a

: 50 N·m (5.1 kg-m, 37 ft-lb) 

Step b

: 60

°

 clockwise

Step c

: Loosen to 0 N·m in the reverse order of 
tightening.

Step d

: 39.2 N·m (4.0 kg-m, 29 ft-lb)

Step e

: 75

°

 clockwise

Step f

: 75

°

 clockwise

WBIA0617E

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-67

< ON-VEHICLE REPAIR >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

Exploded View

INFOID:0000000005274292

Disassembly and Assembly

INFOID:0000000005274293

DISASSEMBLY

1.

Remove spark plug.

2.

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

3.

Remove valve collet, valve spring retainer and valve spring
using Tool. 

CAUTION:

• When working, be careful not to damage valve lifter holes.
• Do not remove valve spring seat from valve spring.

4.

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

1.

Valve collet

2.

Valve spring retainer

3.

Valve spring (with valve spring seat)

4.

Valve oil seal

5.

Valve guide

6.

Cylinder head

7.

Valve seat

8.

Valve (INT)

9.

Valve (EXH)

10. Spark plug tube

11. Spark plug

PBIC3024E

Tool numbers

: KV10116200 (J-26336-A)

: KV10115900 (J-26336-20)

WBIA0477E