ARMY TM 9-2815-259-24
AIR FORCE TO 38G1-125-2
MARINE CORPS 09249A/09246A-24
5.4.4 CRANKSHAFT AND MAIN BEARINGS.
Before removing crankshaft, check crankshaft end play, refer to paragraph 5.4.4
Remove oil pan, refer to paragraph 4.5.3.
Remove oil pump, refer to paragraph 5.4.9.
Remove rocker arm assembly, pushrods, and cam followers, refer to paragraph 4.7.3.
Remove front plate, refer to paragraph 5.4.3.
Remove flywheel housing, refer to paragraph 4.8.3.
Leave front and rear main bearing caps installed until all of connecting rod
caps have been removed. Push pistons and rods away from crankshaft.
(6) Remove connecting rod bearing caps, refer to paragraph 5.4.5.
(7) Check main bearing caps (3 and 4, Figure 5-67) 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 reassembly.
Remove capscrews (1) and washers (2) securing main bearing caps (3 and 4); remove main bearing
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 (PLASTIGAGE) 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 100 lb-ft (135 Nm).
Remove cap and compare width of bearing gage with scale provided, to determine
clearance. Maximum permissible clearance is 0.0043 inch (0.109 mm).