TM 5-3895-359-14&P
CRANKSHAFT
The crankshaft is a one-piece steel forging, heat-treated
CAUTION:
Extreme caution should be used
main and connecting rod bearing journal surfaces are
when removing a flywheel by either
induction hardened.
leaving one or two bolts in the
flywheel, or installing two suitable
Complete static and dynamic balance of the crankshaft
guide pins to support the flywheel
has been achieved by counterweights incorporated in
until a lifting tool or some other
the crankshaft.
suitable safe lifting device is
attached to the flywheel.
The crankshaft end play is controlled by thrust washers
located at the rear main bearing cap of the engine. Full
Each main bearing journal is 3-1/2" in diameter and
pressure lubrication to all connecting rod and main
each connecting rod journal is 2-3/4" in diameter.
bearings is provided by drilled passages within the
crankshaft and cylinder block.
Remove Crankshaft
Two dowels and six tapped holes are provided in the
When removal of the crankshaft becomes necessary,
rear end of the former crankshaft for locating and
first remove the transmission, then proceed as follows:
attaching the flywheel (Fig. 2). One hole is unequally
spaced so that the flywheel can be attached in only one
1. Clean the exterior of the engine.
position.
2. Drain the cooling system.
To standardize, the current crankshaft will no longer
incorporate the two dowels in the flywheel end of the
3. Drain the engine crankcase.
crankshaft. The former and current crankshafts are
interchangeable.
4. Remove all engine to base attaching bolts. Then,
with a chain hoist and sling attached to the lifter
brackets or eye bolts at each end of the engine, remove
the engine from its base.
Fig. 1. Typical Six Cylinder Crankshaft (Former)
10-2-48
