l
Flatness of
gasketed
surface:
Using a straightedge and thickness gauge,
check surface at a total of 6 locations. If the
limit stated below,
is exceeded, correct
gasketed
surface with a surface plate and
abrasive paper of about # 400 (Waterproof
silicon carbide abrasive paper): place paper on
and over surface plate, and rub
gasketed
surface against paper to grind off high spots.
Should this fail to reduce thickness gauge
readings to within the limit, replace cylinder
head.
Leakage of combustion gases from this
gasketed
joint is often due to a warped
gasketed
surface;
such leakage results in
reduced power output.
l
Distortion of manifold seating faces:
Check seating faces of cylinder head for
manifolds, using a straightedge and thickness
gauge, in order to determine whether these
faces should be corrected or cylinder head
replaced.
I
Limit of distortion
0.10 mm (0.004 in.)
I
Limit of distortion
0.05
mm (0.002 in.)
Fig. 3-5-4 In take manifold seating face
Fig. 3-5-2
Fig. 3-5-5 Exhaust manifold seating face
Fig. 3-5-3
3-18
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