Clean; Inspection And Repair - Isuzu 1999 RODEO Workshop Manual

6A–52 ENGINE MECHANICAL (6VD1 3.2L)
2. Remove camshaft bracket fixing bolt (5), camshaft
bracket (6), then camshaft exhaust (7), and intake
side (8).
3. Remove tappet with shim (11).
4. Use the J–8062 valve spring compressor and
J–42898 valve spring compressor adapter to remove
the split collar (12), valve spring with upper seat (13)
and valve (14).
5. Remove spark plug (1).
CAUTION: Do not remove the spark plugs when the
head and plugs are hot. Clean dirt and debris from
spark plug recess areas before removal.

Clean

Cylinder head
Carefully remove all varnish, soot and carbon from the
bare metal. Do not use a motorized wire brush on any
gasket sealing surface.

Inspection and Repair

1. Cylinder head gasket and mating surfaces for leaks,
corrosion and blow–by. If the gasket has failed,
determine the cause.
– Insufficient torque on head bolts
– Improper installation
– Loose or warped cylinder head
– Missing dowel pins
– Warped case surface
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.
CAUTION:
f Do not attempt to weld the cylinder head. Replace
it.
f Do not reuse cylinder head bolts.
4. Cylinder head deck, common chamber and exhaust
manifold mating surfaces for flatness. These
surfaces may be reconditioned by milling. If the
surfaces are "out of flat" by more than specification,
the surface should be ground to within specifications.
Replace the head if it requires machining beyound the
repairable limit.
Head surface and manifold surface
Standard: 0.05 mm (0.002 in) or less
Warpage limit: 0.2 mm (0.0079 in)
Maximum Repairable limit: 0.2 mm (0.0079 in)
Head height
Standard height : 133.2 mm (5.2441 in)
Warpage limit : 0.2 mm (0.0079 in)
Maximum Repairable limit : 133.0 mm (5.2362 in)
014RW042
5. Water jacket sealing plugs seating surfaces.
011RW019