5-20. CRANKSHAFT MAINTENANCE INSTRUCTIONS - Continued
measurement exceeds 1.1929 in. (30.300 mm),
replace the crankshaft assembly.
Check for approximate radial end play of crank-
shaft at front main bearing as follows:
Using vernier caliper, measure diameter (D1)
on crankshaft main bearing journal and re-
cord as X.
With vernier caliper, measure inside diameter
of front main bearing still installed in the en-
gine housing and record as Y.
Subtract X from Y value. If result is greater
than 0.0039 in. (0.10 mm), replace the crank-
shaft (10), and forward defective crankshaft
to general support maintenance.
If radial end play is greater than 0.0039 in.
(0.10 mm), perform inspection of the front
main bearing as described in paragraph 5-
Radial end play at the connecting rod journal
(D2) is measured as instructed in paragraph 5-
13. If radial end play exceeds 0.0043 in. (0.110
mm), replace the crankshaft (10), and forward de
fective crankshaft to general support mainte-
If you are installing a repaired crankshaft,
it is necessary to determire the proper
size front main bearing and connecting rod
bearings to use. Undersize bearings are
available for use when repaired crankshaft
has been properly reground. Table 5-1 pro-
vides dimensional data to determine cor-
rect size of undersized bearings to install.
Lay the assembled seal housing (3) down on a
clean bench surface with the seal side up.
install replacement seal (9), with seal lip towards
bearing, in seal housing (3), using an arbor press
with a pressing sleeve (at least 3.375 in. (85 mm)
RADIAL BEARING PLAY
0.0004 - 0.0024 in.
(0.011 - 0.06 mm)
0.0012 - 0.0024 in.
(0.030 - 0.060 mm)
Table 5-1. Crankshaft Undersized Bearing
R o d
(39.810 mm) (39.830 mm)
139.560 mm) (39.580 mm)
(39.770 mm) (39.780 mm)