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Chapter 6 INSPECTION AND REPAIR OF BASIC ENGINE
1.15 Distortion of Cylinder Head Bottom Surface - Measure
Refacing depth of cylinder head is to be mini-
mum.Excessive grinding of the cylinder head may
result in defects such as contact between piston and
valve.
With a straight edge placed on the bottom face of cylinder
head, measure the bottom face distortion with thickness
gauges.If the value exceeds the limit, replace the cylinder
head with a new one, or repair by grinding.
After grinding, record the maximum depth of grinding.The
maximum amount of total grinding, which includes both
grinding amount of the top of crankcase and the bottom of
cylinder head, must be 0.50 mm [0.020 in.] or less.
Item
Distortion of cylinder head
bottom surface
[0.0012 in.] or less
The height of cylinder head
134.9 to 135.1 mm
(reference value)
1.16 Water Director - Inspect and Replace
(1) Inspect the water director, and if corrosion or damage is
found, replace the water director with a new one.
(2) Orient the pipe and the opening of the water director as
shown in the illustration, and tap the water director
lightly.
6-10
Standard value
Limit value
0.03 mm
0.07 mm
[0.0028 in.]
-
[5.31 to 5.32 in.]
Cylinder head
Distortion of Cylinder Head Bottom Surface - Measure
Cylinder head top face
roughness:
Ra 3.2 μ m{
}
12.5S
Height of cylinder head - Measure
35°
A
A
1.0 mm
[0.039 in.]
Section AA
Water director mounting direction
1
34.9 to 135.1 mm
[5.311 to 5.319 in.]
Water director
B
B
1.0 mm [0.039 in.]
Section BB
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