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EM-36
ENGINE MECHANICAL - Cylinder Head (4A-GE)
EM0850
EM4446
EM4447
EM4448
5.
CLEAN CYLINDER HEAD
Using a soft brush and solvent, throughly clean the head.
CAUTION:
Do not clean the head in a hot tank as this
would seriously damage it.
6.
INSPECT CYLINDER HEAD FOR FLATNESS
Using a precision straight edge and feeler gauge, measure
the surfaces contacting the cylinder block and manifold
for warpage.
Maximum surface warpage:
Cylinder block side
Intake manifold side
Exhaust manifold side
0.05
mm
(0.0020
in.)
0.05
mm
(0.0020
in.)
0.1 0
mm
(0.0039
in.)
If warpage is greater than maximum, replace the cylinder
head.
7.
INSPECT CYLINDER HEAD FOR CRACKS
Using a dye penetrant, check the combustion chamber,
intake and exhaust ports, head surface and the top of the
head for cracks.
If a crack is found, replace the head.
8.
CLEAN VALVES
(a)
Using a gasket scraper, chip any carbon from the
valve.
(b)
Using a wire brush, throughly clean the valve.
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Troubleshooting
