Workshop Manual

6A–50
ENGINE MECHANICAL (6VE1 3.5L)
Disassembly
NOTE:
B During disassembly, be sure that the valve train
components are kept together and identified so that
they can be reinstalled in their original locations.
B Before removing the cylinder head from the engine
and before disassembling the valve mechanism,
perform a compression test and note the results.
1.Remove camshaft drive gear pulley fixing bolt (3),
then pulley (4).
2.Remove camshaft bearing cap fixing bolt (5),
camshaft bearing cap (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).
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 surface conditioning disc on any
gasket sealing surface.
Inspection and Repair
1.Inspect 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.Inspect cylinder head for cracks, especially between
valve seats and in the exhaust ports.
3.Inspect cylinder head deck for corrosion, sand
particles in head and porosity.
CAUTION:
B Do not attempt to weld the cylinder head. Replace
it.
B Do not reuse cylinder head bolts.
4.Inspect 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” with “round” 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.