Nissan Xterra. Manual — part 365
EM-88
< REMOVAL AND INSTALLATION >
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CYLINDER HEAD
CYLINDER HEAD
Exploded View
INFOID:0000000009484484
Removal and Installation
INFOID:0000000009484485
NOTE:
When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-
ing.
REMOVAL
1. Remove camshaft. Refer to
EM-76, "Removal and Installation"
.
2. Remove intake manifold. Refer to
EM-28, "Removal and Installation"
3. Remove exhaust manifold. Refer to
EM-31, "Removal and Installation (Exhaust Manifold)"
4. Remove front final drive assembly (4WD models). Refer to
DLN-165, "Removal and Installation"
.
5. Remove water inlet and thermostat assembly (left bank). Refer to
CO-26, "Removal and Installation"
6. Remove water outlet, water pipe and heater pipe (left bank). Refer to
CO-28, "Removal and Installation"
.
1.
Rubber plug
2.
Cylinder head (left bank)
3.
Cylinder head bolt
4.
Cylinder head (right bank)
5.
Harness bracket
6.
Cylinder head gasket (right bank)
7.
Cylinder head gasket (left bank)
PBIC2934E
CYLINDER HEAD
EM-89
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7. Remove cylinder head bolts in reverse order as shown using
suitable tool and power tool to remove cylinder heads (right and
left banks).
8. 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
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.
• Replace cylinder head If measured distortion exceeds the
limit.
INSTALLATION
PBIC2057E
Limit [(d1) - (d2)]
: 0.11 mm (0.0043 in)
PBIC2480E
Limit
: 0.1 mm (0.004 in)
SEM861E
EM-90
< REMOVAL AND INSTALLATION >
[VQ40DE]
CYLINDER HEAD
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 are re-used, check their outer diame-
ters before installation. Refer to
(Cylinder Head Bolts Outer Diameter).
Measure the tightening angle using Tool.
SEM532G
Step a
: 98.1 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
CYLINDER HEAD
EM-91
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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 engine, check oil/fluid levels including engine coolant and engine oil. If less than required
quantity, fill to the specified level. Refer to
MA-12, "Fluids and Lubricants"
.
• Use procedure below to check for fuel leakage.
• Turn ignition switch ON (with engine stopped). With fuel pressure applied to fuel piping, check for fuel leak-
age at 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 oils/fluids including
engine oil and engine coolant.
• Bleed air from passages in lines and hoses, such as in cooling system.
• After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill to spec-
ified level, if necessary.
• Summary of the inspection items:
*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
Transmission/
transaxle fluid
A/T and CVT Models
Leakage
Level/Leakage
Leakage
M/T Models
Level/Leakage
Leakage
Level/Leakage
Other oils and fluids*
Level
Leakage
Level
Fuel
Leakage
Leakage
Leakage
Exhaust gas
—
Leakage
—
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