Inspecting And Repairing Piston, Connecting Rod, Crankshaft And Crankcase; Measuring Crankcase Top Surface Distortion - Mitsubishi S6S-Y3T61HF Service Manual

INSPECTION AND REPAIR OF BASIC ENGINE

4. Inspecting and repairing piston, connecting rod, crankshaft and crankcase

4.1 Measuring crankcase top surface distor-
tion
CAUTION
Refacing of cylinder head should be kept to an abso-
lute minimum.
Excessive grinding of the cylinder head may result in
defects such as defective combustion and stamping
(contact between piston and valve).
Apply a straight edge to the top surface of the crankcase and
measure its distortion using a feeler gauge. If the distortion
exceeds the limit, grind the crankcase using a surface
grinder.
Note: Do not overgrind the cylinder head, as the piston
protrusion deviates from the standard value.
Item
Flatness of top surface
Note: Do not grind the surfaces more than 0.2 mm
[0.0079 in.] in total (cylinder head bottom surface
plus crankcase top surface).
6-16
Standard Limit
0.05 mm 0.20 mm
[0.0020 in.] or less [0.0079 in.]

Measuring crankcase top surface distortion