ARMY TM 9-2815-256-24
AIR FORCE TO 38G1-96-2
MARINE CORPS TM 2815-24/5
Section XIV. CRANKSHAFT AND MAIN BEARINGS MAINTENANCE
3-43. CRANKSHAFT AND MAIN BEARINGS.
Check crankshaft end play, refer to paragraph 3-43.2.
Remove oil pan, refer to paragraph 3-20.1.
Remove oil pump, refer to paragraph 3-21.1.
Remove rocker arm assembly, pushrods, and cam followers, refer to paragraph 3-33.1.
Remove front plate, refer to paragraph 3-42.1.
Remove flywheel housing, refer to paragraph 3-37.1.
Leave front and rear main bearing caps installed until all of connecting rod caps have been removed.
Push pistons and rods away from crankshaft.
Remove connecting rod bearing caps, refer to paragraph 3-44.1.
Check main bearing caps (3 and 4, FIGURE 3-137) for arrows (cast in bearing cap) and numbers stamped on
cap and oil pan rail. Arrow points toward camshaft side of engine. If there are no numbers, stamp corresponding
numbers on cap and oil pan rail. This will assure correct placement location of main bearing caps during
Remove capscrews (1) and washers (2) securing main bearing caps (3 and 4); remove main bearing caps.
Visually inspect condition of bearing inserts (5 and 6) as main bearing caps are removed. Keep caps
and inserts together and in correct order.
Check bearing (5 and 6) clearances as follows:
Place a strip of bearing gage (PLASTIGAG EPR1 ) in the center of the main bearing cap about three
fourths of width of bearing.
Use oil on bearing gage to prevent smearing.
Install cap and tighten capscrews (1) to 85 ft-lbs (115 Nm).
Remove cap and compare width of bearing gage with scale provided, to determine clearance. Maximum
permissible clearance is 0.006 inch (0.15 mm).