Mitsubishi S12A2 User Manual

6-10
Chapter 6 INSPECTION AND REPAIR OF BASIC ENGINE
1.15 Distortion of Cylinder Head Bottom Surface - Measure
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.
Distortion of Cylinder Head Bottom Surface - Measure
Height of cylinder head - Measure
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.
Water director mounting direction
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.
Item Standard value Limit value
Distortion of cylinder head
bottom surface
0.03 mm
[0.0012 in.] or less
0.07 mm
[0.0028 in.]
The height of cylinder head
(reference value)
134.9 to 135.1 mm
[5.31 to 5.32 in.]
-
Cylinder head
Cylinder head top face
roughness:
Ra 3.2 μ m{ }
12.5S
134.9 to 135.1 mm
[5.311 to 5.319 in.]
ٖٖٖ
A
B
B
A
35°
Water director
1.0 mm [0.039 in.]
1.0 mm
[0.039 in.]
Section AA
Section BB

Mitsubishi S12A2 Specifications

General

Brand	Mitsubishi
Model	S12A2
Category	Engine
Language	English