Isuzu NHR 4J Series, Workshop Manual

Page: 70 / 406

GENERAL ENGINE MECHANICAL 6A – 3
2) Use the nozzle holder remover and the sliding
hammer to remove the nozzle holder together with
the holder bracket.
Nozzle Holder
Remover: 5-8840-2034-0
Sliding Hammer: 5-8840-0019-0
3. Glow Plug and Glow Plug Connector (4JG2)
3a. Glow Plug and Glow Plug Connector (4JB1,
4JB1TC)
4. Rocker Arm Shaft and Rocker Arm
5. Push Rod
6. Cylinder Head
• Loosen the cylinder head bolts a little at a time in
the numerical order shown in the illustration.
NOTE:
Failure to loosen the cylinder head bolts a little at
a time in numerical order will adversely effect the
cylinder head lower surface
.
CLEAN
• Cylinder head bolts
• Cylinder head
Carefully remove all varnish, soot and carbon to
the bare metal. Do not use a motorized wire brush
on any gasket sealing surface.
INSPECTION AND REPAIR
Make the necessary adjustments, repairs, and part
replacements if excessive wear or damage is discovered
during inspection.
•
Cylinder head gasket and mating surfaces for leaks,
corrosion and blow-by. If the gasket has failed,
determine the cause;
- Improper installation
- Loose or warped cylinder head
- Insufficient torque on head bolts
- Warped case surface
1. Cylinder head bolts for damaged threads or stretching
and damaged heads caused by improper use of tools.
CAUTION:
Suspected bolts must be replaced.
2. Cylinder head for cracks, especially between valve
seats and in the exhaust ports.
3. Cylinder head deck for corrosion, sand particles in
head and porosity.
6A-3-1.tif
6A-3-2.tif