ARMY TM 9-2815-255-24
AIR FORCE TO 38G1-95-2
MARINE CORPS TM 2815-24/4
a. Install gear (11, FIGURE 3-118) on crankshaft as follows:
Oil fumes or oil can Ignite above 380°F (193°C). Use a thermometer and do not exceed 360°F
(182°C). Do not allow a flame or heating element to be In direct contact with oil. Heat oil In a well
ventilated area. Plan a safe handling procedure to avoid burns. Wear protective clothing,
gloves, apron, etc.
Heat gear (11), in oil, to 360°F (182°C).
A properly heated gear may not require a driver for installation.
Install key (12) in crankshaft (7) slot, and using driver (JDH-7), drive heated gear (11) onto crankshaft.
b. Install main bearing (6) inserts. Make sure that tang on inserts is engaged with slot in engine block and main
bearing caps. Also make sure that oil holes line up with oil passages in block.
If new thrust bearing Inserts or thrust bearing washers are installed, they must be Installed as a
c. Install main thrust bearing (5) in rear web of engine block
d. Apply a liberal coating of clean engine lubricating oil (MIL-L-2104) to bearing surfaces and crankshaft journals.
e. Using proper lifting equipment, lower crankshaft (7) onto main bearings.
f. Dip entire bearing capscrews (1) in clean engine lubricating oil (MIL-L-2104) and position them in the main
bearing caps. Apply a liberal amount of oil to bearing inserts in caps.
Make sure bearing caps are installed on the bearing bosses from which they were removed. The
numbers stamped on the caps should be on the same side as the numbers on the block. If there
is an arrow on cap, arrow must point toward camshaft side of block.
g. Install each bearing cap (3 and 4), bearings (5 and 6), and capscrews (1) with washers (2) with the recesses
and tabs aligned in matching order. Make sure bearing tabs also match up before tightening capscrews.
Do not use pneumatic wrench to install main bearing capscrews, as damage may occur to the
h. Before tightening capscrews on main bearing caps, align upper and lower thrust washers or flanges on main
thrust bearings (5). Using a soft-face hammer, tap crankshaft to the rear and then to the front to line up thrust