Distortion of gasketed surface:
Using a straightedge and thickness gauge, check the flatness at
a total of 6 locations. If the limit, stated below, is exceeded, cor-
rect the gasketed surface with a surface plate and abrasive pa-
per of about # 400 (waterproof silicon carbide abrasive paper):
place the paper on and over the surface plate, and rub the gas-
keted surface against the paper to grind off high spots. Should
this fail to reduce the thickness gauge readings to within the limit,
replace the cylinder head.
Leakage of combustion gases from this gasketed joint is often
due to warped gasketed surface; such leakage results in re-
duced power output and hence a higher cost of fuel per kilome-
ter.
Distortion of manifold seating faces:
Check the seating faces of cylinder head for manifolds, using a
straightedge and thickness gauge, in order to determine wheth-
er these faces should be corrected or the cylinder head re-
placed.
Checking exhaust manifold seating face
Checking intake manifold seating face
ENGINE MECHANICAL (F8B ENGINE)
6A-19
Limit of distortion
0.05 mm (0.002 in.)
Limit of distortion
0.10 mm (0.004 in.)
