Nissan Xterra. Manual — part 363
EM-80
< REMOVAL AND INSTALLATION >
[VQ40DE]
CAMSHAFT
• Measure the outer diameter at 1/2 height of valve lifter with
micrometer since valve lifter is in barrel shape.
VALVE LIFTER HOLE DIAMETER
• Measure the inner diameter of valve lifter hole of cylinder head with
inside micrometer.
VALVE LIFTER CLEARANCE
• (Valve lifter clearance) = (Valve lifter hole diameter) – (Valve lifter outer diameter), Refer to
.
• If the calculated value is out of the standard, referring to each standard of valve lifter outer diameter and
valve lifter hole diameter, replace either or both valve lifter and cylinder head.
INSTALLATION
1. Install timing chain tensioners (secondary) on both sides of cyl-
inder head.
• Install timing chain tensioner with its stopper pin attached.
• Install timing chain tensioner with sliding part facing downward
on right-side cylinder head, and with sliding part facing upward
on left-side cylinder head.
• Install new O-rings as shown.
CAUTION:
Do not reuse O-rings.
2. Install valve lifters.
• Install it in the original position.
3. Install camshafts.
Standard (Intake and exhaust)
: 33.977 - 33.987 mm (1.3377 - 1.3381 in)
JEM798G
Standard (Intake and exhaust)
: 34.000 - 34.016 mm (1.3386 - 1.3392 in)
SEM867E
Standard (Intake and exhaust)
: 0.013 - 0.039 mm (0.0005 - 0.0015 in)
PBIC2111E
CAMSHAFT
EM-81
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• Install camshaft with dowel pin attached to its front end face on
the exhaust side.
• Follow your identification marks made during removal, or fol-
low the identification marks that are present on new camshafts
for proper placement and direction.
• Install camshaft so that dowel pin hole and dowel pin on front
end face are positioned as shown. (No. 1 cylinder TDC on its
compression stroke)
NOTE:
• Large and small pin holes are located on front end face of
camshaft (INT), at intervals of 180
°. Face small dia. side pin
hole upward (in cylinder head upper face direction).
• Though camshaft does not stop at the portion as shown, for
the placement of cam nose, it is generally accepted cam-
shaft is placed for the same direction as shown.
KBIA1071E
Bank
INT/EXH
Dowel pin
Paint marks
Identification
mark
M1
M2
RH
INT
No
Green
No
RE
EXH
Yes
No
White
RE
LH
INT
No
Green
No
LH
EXH
Yes
No
White
LH
KBIA1009E
PBIC2478E
EM-82
< REMOVAL AND INSTALLATION >
[VQ40DE]
CAMSHAFT
4. Install camshaft brackets.
• Remove foreign material completely from camshaft bracket
backside and from cylinder head installation face.
• Install camshaft bracket in original position and direction as
shown.
• Install camshaft brackets (No. 2 to 4) aligning the stamp marks
as shown.
NOTE:
There are no identification marks indicating left and right for
camshaft bracket (No. 1).
• Apply liquid gasket to mating surface of camshaft bracket (No.
1) as shown on right and left banks.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-21, "Recommended Chemical Products and Sealants"
.
PBIC2051E
PBIC2052E
PBIC2660E
CAMSHAFT
EM-83
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5. Tighten camshaft bracket bolts in the following steps, in numeri-
cal order as shown.
6. Measure the difference in levels between front end faces of
camshaft bracket (No. 1) and cylinder head.
• Measure two positions (both intake and exhaust side) for a
single bank.
• If the measured value is out of the standard, re-install cam-
shaft bracket (No. 1).
7. Check and adjust the valve clearance. Refer to
.
8. Installation of the remaining components is in the reverse order of removal.
INSPECTION AFTER INSTALLATION
Inspection of Camshaft Sprocket (INT) Oil Groove
WARNING:
• Check when engine is cold so as to prevent burns from any splashing engine oil.
CAUTION:
• Perform this inspection only when DTC P0011 or P0021 are detected in self-diagnostic results of
CONSULT and it is directed according to inspection procedure of EC section. Refer to
.
1. Check the engine oil level. Refer to
.
2. Perform the following procedure so as to prevent the engine from being unintentionally started while
checking.
a. Release fuel pressure. Refer to
.
b. Disconnect the harness connectors from ignition coil and injector.
3. Remove intake valve timing control solenoid valve. Refer to
EM-51, "Removal and Installation"
Camshaft bracket bolts
Step 1 (bolts 7 - 10)
: 1.96 N·m (0.2 kg-m, 17 in-lb)
Step 2 (bolts 1 - 6)
: 1.96 N·m (0.2 kg-m, 17 in-lb)
Step 3 (bolts 1 - 10)
: 5.88 N·m (0.6 kg-m, 52 in-lb)
Step 4 (bolts 1 - 10)
: 10.4 N·m (1.1 kg-m, 92 in-lb)
PBIC2050E
Standard : –0.14 to 0.14 mm (–0.0055 to 0.0055 in)
EMQ0044D
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