ARMY TM 9-6115-670-14&P
6-71
6.28. CRANKSHAFT BEARING 1.
This task covers: a. Test
b. Replace
INITIAL SETUP
Tools
Inside Micrometer Caliper
(Item 47, Appendix B)
Outside Micrometer Caliper
(Item 48, Appendix B)
Crankshaft Bearing 1 Replacing Tool
(Item 16, Appendix B)
Equipment Conditions
Crankshaft bearing case 1 removed from
crankshaft (para 6.25.).
Materials/Parts
Crankshaft Bearing 1
TEST
a. Refer to Figure 6-25 (sheet 1) and use inside micrometer caliper to measure the ID of
crankshaft bearing 1. ID should be between 1.57418 and 1.57638 in. (33.984 and 40.040 mm).
b. Use outside micrometer caliper to measure the OD of crankshaft journal. OD should be
between 1.57221 and 1.57284 in. (33.934 and 39.950 mm).
c. Calculate oil clearance. Oil clearance should be between 0.00134 and 0.00417 in. (0.034 and
0.016mm).
d. If oil clearance exceeds 0.0079 in. (0.20 mm), replace bearing. Refer to Table 6-2 and
Appendix C and replace with an undersize bearing if necessary.
Table 6-2. Undersize Crankshaft Bearing I
Crankshaft Journal OD
Undersize Crankshaft Bearing I
1.56433 to 1.56496 in.
(39.734 to 39.750 mm)
1.55646 to 1.55709 in.
(39.534 to 39.550 mm)
0.008 in.
(0.2 mm)
0.016 in.
(0.4 mm)
