Measuring Crankshaft End Play; Measuring Crankshaft Runout - Mitsubishi S6S-Y3T61HF Service Manual

INSPECTION AND REPAIR OF BASIC ENGINE

4.18 Measuring crankshaft end play

(1) Measure the crankshaft end play (clearance between the
crank arm at the thrust force receiving journal and the
bearing cap with thrust plate attached). If the limit is
exceeded, replace the thrust plate with a new one.
(2) If the limit is still exceeded after a new thrust plate has
been installed, use an oversize thrust plate.
Note: In general, the rear thrust bearing wears faster than
the front thrust bearing. Therefore, in most cases, the
correction is achieved by replacing the rear thrust
plate with the next oversize one.
Item
Crankshaft end play
[0.0039 to 0.0104 in.]
Crankshaft thrust size after grinding
OS, used
Item
on one side
+0.15 mm 31.15 mm
[+0.0059 in.] OS [1.2264 in.]
+0.30 mm 31.30 mm
[+0.0118 in.] OS [1.2323 in.]

4.19 Measuring crankshaft runout

Support the crankshaft at the front and rear journals with V-
blocks, and measure the crankshaft runout at the center
journal using a dial gauge. If the runout deviates from the
standard only slightly, grind the crankshaft to repair. If the
runout exceeds the standard considerably, straighten the
crankshaft using a press.
If the limit is exceeded, replace the crankshaft.
If the crankshaft has been repaired by grinding or pressing,
inspect the crankshaft for cracks and other harmful damage
using a magnetic particle method.
Item Standard
Crankshaft 0.04 mm
runout [0.0016 in.] or less
6-26
Standard
0.100 to 0.264 mm 0.300 mm
[0.0118 in.]
OS, used
Tolerance
on both sides
31.30 mm
[1.2323 in.] +0.039
31.45 mm [
[1.2382 in.]
Limit Remark
0.10 mm
[0.0039 in.]
Limit
mm
0
+0.0015
in.]
0.00
TIR
Width of crankshaft thrust journal
Measuring crankshaft end play
Measuring crankshaft runout
+0.039
31 mm
0
+0.015
[1.22 in.]
0.00