CYLINDER HEAD
EM-89
< REMOVAL AND INSTALLATION >
[VQ40DE]
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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 EM-112, "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.
• 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
Revision: January 2013 2013 Xterra
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