TM 5-3895-376-14&P
5-20. CRANKSHAFT MAINTENANCE INSTRUCTIONS - Continued
measurement exceeds 1.1929 in. (30.300 mm),
replace the crankshaft assembly.
7.
Check for approximate radial end play of crank-
shaft at front main bearing as follows:
a. Using vernier caliper, measure diameter (D1)
on crankshaft main bearing journal and re-
cord as X.
b.
With vernier caliper, measure inside diameter
of front main bearing still installed in the en-
gine housing and record as Y.
c.
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
RADIAL BEARING PLAY
to general support maintenance.
MAX. LIMIT
NEW PARTS
0.0039 in.
0.0004 - 0.0024 in.
NOTE
(0.10 mm)
D1
(0.011 - 0.06 mm)
If radial end play is greater than 0.0039 in.
0.0043 in.
0.0012 - 0.0024 in.
(0.10 mm), perform inspection of the front
D2
(0.110 mm)
(0.030 - 0.060 mm)
main bearing as described in paragraph 5-
8.
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-
nance.
INSTALLATION
Table 5-1. Crankshaft Undersized Bearing
NOTE
Selection Chart.
If you are installing a repaired crankshaft,
Bearing
Bearing
MAX.
MIM.
it is necessary to determire the proper
Part
Journal
Diameter
size front main bearing and connecting rod
Diameter
Number
bearings to use. Undersize bearings are
available for use when repaired crankshaft
Front Main
1.5673 in.
1.5681 in. 775.033.04
has been properly reground. Table 5-1 pro-
Bearing
(39.810 mm) (39.830 mm)
vides dimensional data to determine cor-
(D1)
rect size of undersized bearings to install.
1.5575 in.
1.5583 in. 775.034.4
139.560 mm) (39.580 mm)
Lay the assembled seal housing (3) down on a
1.
Connecting
1.5657 in.
1.5661 in. 470.009.4
clean bench surface with the seal side up.
Rod
(39.770 mm) (39.780 mm)
Bearing
2.
install replacement seal (9), with seal lip towards
bearing, in seal housing (3), using an arbor press
(D2)
with a pressing sleeve (at least 3.375 in. (85 mm)
5-59
