TM 5-3805-281-24-2
Crankshaft, Main Bearings, and Flywheel
Installing Crankshaft
Installing Main Bearing Caps
to the rear and then to the front to line up thrust
CAUTION: Crankshaft is heavy. Plan a
bearing flanges.
proper lifting procedure to avoid injuries.
8. Tighten No.'s 1, 2, 3, 4, 6, and 7 main bearing cap
4. Carefully position crankshaft onto main bearing
screws to 68 Nm (50 lb-ft). Hand -tighten No. 5
inserts using a hoist and lift sling, as shown.
main thrust bearing cap screws.
5. Dip entire main bearing cap screws in clean engine
9. Gently pry crankshaft rearward and then forward to
oil and position them in main bearing caps. Apply a
align thrust washers on No. 5 main thrust bearing.
liberal amount of oil to bearing inserts in caps.
NOTE: DO NOT PRY crankshaft on No. 5 main thrust
6. Install each bearing cap (B), bearings (C), and cap
bearing.
screws with washer (A) with the recesses and tabs
aligned in matching order. Make sure bearing tabs
10. Tighten No. 5 main thrust bearing cap screws
also match up before tightening cap screws.
68 Nm (50 lb-ft).
NOTE: Make sure main bearing caps are installed on
11. Tighten all main bearing cap screws (including
the bearing bosses from which they were
No. 5) to final torque of 230 Nm (170 lb-ft).
removed. The numbers stamped on the caps
should be on the same side as the numbers
12. Turn crankshaft by hand. If it does not turn easily,
on the block. If there is an arrow on cap, arrow
disassemble parts and determine the cause.
must be on the camshaft side of the block
pointing towards the front of the engine. If
13. Install connecting rod bearings and connecting
bearing caps have been rebored, make sure
rods caps. See INSTALL PISTONS AND
bearing caps have numbers stamped on them.
CONNECTING RODS in Group 10.
IMPORTANT: Do not use pneumatic wrench to
14. Check crankshaft for 0.038--0.380 mm
install main bearing cap screws, as
(0.00150--0.0150 in.) end play.
damage may occur to threads.
15. Install oil pump and check drive gear-to-crankshaft
7. Before tightening cap screws on main bearing caps,
clearance. See INSTALL ENGINE OIL PUMP in
align upper and lower thrust flanges on main thrust
Group 20.
bearings. Using a soft-face hammer, tap crankshaft
RG,RG34710,1181
1923OCT972/2
11-240
