fold seats ISUZU TROOPER 1998 Service Repair Manual

6A±53
ENGINE MECHANICAL
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 5±8840±2446±0 valve spring compressor
and 5±8840±2547±0 valve spring compressor
adapter to remove the split collar (12), valve spring
with upper seat (13) and valve (14).
014RW042
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:

Do not attempt to weld the cylinder head. Replace
it.

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 ªout of flatº by more than specification,
the surface should be ground to within specifications.
Replace the head if it requires machining beyond 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)011RW019
5. Water jacket sealing plugs seating surfaces.
Reassembly
1. Install Spark plug and tighten all the spark plugs to
specified torque.
Torque: 18 N´m (1.8 Kg´m/13 lb ft)
2. Tighten sub gear setting bolt.
1. Use 5±8840±2443±0 gear spring lever to turn sub
gear to right direction until the M5 bolt aligns with
the hole between camshaft driven gear and sub
gear.

ENGINE MECHANICAL 6A Ð 3
INSPECTION AND REPAIR
Make the necessary adjustments, repairs, and part re-
placements 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;
Ð Improper installation
Loose or warped cylinder head
Ð Insufficient torque on head bolts
Ð Warped case surface
1. Cylinder head bolts for damaged threads or stretch-
ing 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.
CAUTION:
Do not attempt to weld the cylinder head. Replace it.
4. Cylinder head deck, intake and exhaust manifold
mating surfaces for flatness.
These surfaces may be re-conditioned by milling. If
the surfaces are Òout of flatÓ by more than specifica-
tion, the surface should be grinded to within specifi-
cations. If more than limit of specification, it should
be replaced.
5. Water jacket sealing plugs seating surfaces.
6. Use a straight edge and a feeler gauge to measure
the manifold cylinder head fifting face warpage.
Regrind the exhaust manifold cylinder head fifting
surfaces if the measured values are between the
specified limit and the standard.
If the measured values exceed the specified limit, the
manifold must be replaced.
Cylinder Head
Lower Face
Warpagemm (in)
0.05 (0.0020)
or less0.20 (0.0079)
Cylinder Head
Height92 (3.6220)
–
Standard Limit
Standard Limit
mm(in)
0.05 (0.0020) or less 0.20 (0.0079) Exhaust Manifold Warpage

6A – 42 ENGINE MECHANICAL
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: Do not attempt to weld the cylinder
head. Replace it.
4. Cylinder head lower surface for flatness.
Use a straight edge and a feeler gauge to measure
the cylinder head lower surface warpage.
If the measured values exceed the specified limit,
the cylinder head must be replaced.
Cylinder Head Lower Face Warpage:
Standard: 0.075 mm (0.0029 in) or less
Limit: 0.2 mm (0.0079 in)
Cylinder Head Height:
Standard: 95 mm (3.740 in)
5. Water jacket sealing plugs seating surfaces.
6. Use a straight edge and a feeler gauge to measure
the manifold cylinder head fitting face warpage.
If the measured values exceed the specified limit,
the manifold must be replaced.
Exhaust Manifold Warpage:
Standard: 0.05 mm (0.0020 in) or less
Limit: 0.20 mm (0.0079 in)
CAUTION: Do not attempt to weld the cylinder
head. Replace it.
REASSEMBLY
1. Cylinder Head
•Refer to “Cylinder Head Gasket”.
2. Glow Plug and Glow Plug Connector
•Tighten glow plugs.
Torque: 15 N·m (1.5 kg·m/11 lb ft)
011RW006
012RW053