Measuring Crankcase Top Surface Distortion; Inspecting Tappet; Measuring Clearance Between Tappet And Tappet Guide Hole - Mitsubishi S3Q2 Service Manual

4.15 Measuring crankcase top surface distor-
tion
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 cylinder head using a surface
grinder.
Note: Do not overgrind the cylinder head, as the piston
protrusion deviates from the standard value.
Item
Distortion of crankcase
top surface
Note: Do not grind the surfaces more than 0.2 mm
[0.008 in.] in total (cylinder head bottom surface plus
crankcase top surface).

4.16 Inspecting tappet

Inspect the cam contact surface of the tappets. Fit new
tappets if the surface is excessively worn or damaged.
4.17 Measuring clearance between tappet and
tappet guide hole
Measure clearance between the tappet and tappet hole.
Replace the tappet with a new one if the limit is exceeded.
Item Nominal
Tappet hole ø 14 mm
inside diameter [0.55 in.]
Clearance
between tappet -
and tappet hole
Standard Limit
0.05 mm 0.20 mm
[0.0020 in.] or less [0.0079 in.]
Standard Limit
14.000 to 14.018 mm 14.100 mm
[0.5512 to 0.5519 in.] [0.5551 in.]
0.016 to 0.052 mm 0.080 mm
[0.0006 to 0.0020 in.] [0.0031 in.]
INSPECTION AND REPAIR OF BASIC ENGINE

Measuring crankcase top surface distortion

Good Bad
Contact surface of tappet and cam
Measuring
direction
Measuring
points
Measuring tappet outside diameter and crankcase
tappet bore inside diameter
Bad
Measuring
direction
Measuring
points
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