Mitsubishi S4Q User Manual

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Service Manual Mitsubishi SQ-Series diesel engines
Version 08/2004
PISTONS, CONNECTING RODS,
CRANKSHAFT AND CRANKCASE
ENGLISH
ENGINE MAIN PARTS
d Bore the cylinders to the calculated
dimension.
e Hone the cylinders to the final dimension
(piston outside diameter + cylinder clearance).
2. Checking crankcase top face
Check the top face for warpage, using an accurate
straight edge and a feeler gage, in three positions
lengthwise, two crosswise and two widthwise, as
shown in the illustration. If warpage exceeds the
repair limit, grind the crankcase.
Unit: mm [in.]
10.2.5 Tappets
1. Checking for wear
Check the cam contact face of each tappet for
wear. Replace badly worn tappets if any.
CAUTION
Before the cylinders in the order of the cylinder
numbers to prevent distortion due to the heat
generated by the boring operation.
Figure 133 Checking crankcase top face
Item
Assembly
Standard
Repair Limit
Warpage of
crankcase top
face
0.05 [0.0020] or
less
0.20
[0.0079]
NOTE
The maximum limit of stock to be removed from the
crankcase and cylinder head for grinding is 0.2 mm
[0.0079 in.] in all.
Figure 134 Cam contact face of tappet
Good Bad Bad

Mitsubishi S4Q Specifications

General

Brand	Mitsubishi
Model	S4Q
Category	Engine
Language	English