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 EM-129, "Stan-
dard and Limit".
• 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
Revision: January 2013 2013 Xterra
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