TM 5-4310-387-14
6-21. Crankshaft and Mainbearing Support.
This task covers:
a.
Replace
b.
Repair
INITIAL SETUP
Tools
Equipment Condition
General Mechanic's Tool Kit (NSN 5180-00-177-7033)
Flywheel removed (para. 5-35).
Caliper Set (NSN 5210-00-554-7134)
Piston and connecting rod assembly removed
Pliers, Retaining Ring (NSN 5120-00-789-0492)
(para. 6-20).
Wrench, Torque (NSN 5120-00-554-7292)
Oil filter screen removed (para. 4-31).
Governor assembly removed (para. 6-17).
Oil pump assembly removed (para. 5-34).
Materials/Parts
Reference
Preformed Packing
Gasket
Appendix F Torque Values.
Retaining Ring
Crankshaft Assembly
Dry Cleaning Solvent (Item 21, Appendix E)
Rags, Wiping (Item 19, Appendix E)
Oil, Lubricating (Item 16, Appendix E)
a.
Replace. (figure 6-21)
(1)
Using puller, remove gear (1).
(2)
Remove key (2).
(3)
Remove four nuts (3) and washers (4).
(4)
Screw two screws (5) into threaded holes in bearing carrier (6) and tighten screws (5) evenly until carrier
(6) breaks free and remove screws (5).
(5)
Remove carrier (6), two belleville washers (7), oil seal (8), preformed packing retainer (9), preformed
packing (10), and gasket (11). Discard preformed packing (10) and gasket (11).
(6)
Remove retaining ring (12) and remove bearing (13) from carrier (6). Discard retaining ring (12).
(7)
Remove crankshaft (14).
(8)
Press bushing (15) out of crankcase (16).
(9)
Remove connecting rod bearings (17) from connecting rod (18) and bearing cap (19).
(10)
Install new connecting rod bearings (17) in connecting rod (18) and bearing cap (19).
(11)
Coat outside of bushing (15) with clean engine oil and press new bushing (15) into crankcase (16).
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