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 TM 55-1905-220-14-8
4-7.10A. ENGINE - MAINTENANCE INSTRUCTIONS (Continued)
ENGINE OVERHAUL (Cont)
g. Broken, Damaged Rods.
Pounding on the end of the crankshaft to remove the flywheel can play havoc with connecting rods and
rod bearings. the practice can push the counterweights together squeezing the rod small end bearing, indicated
by the metal lapped over edges. This, of course, freezes the needle bearing and snaps the connecting rod.
Always use a puller to remove the flywheel and also to get the impeller off the taper of the crankshaft.
ENGINE RECONDITIONING
a. Crankshaft - Connecting Rod.
NOTE
If a visual check fails to uncover any damage,
install crankshaft-rod assembly in vise - use
protective caps on jaws. Make following tests to
determine if the crankshaft-rod assembly and be
reused. Do not attempt to disassemble crankshaft
for reconditioning - special tools and equipment
are required for this. If center main or rod bear-
ings or crankshaft are damaged, or connecting rods
have any noticeable radial play replace assembly as
a unit. Do not reinstall outer main bearing until
after end play is established.
(1) Outer Main Bearing.
First check crankshaft outer main bearings for evidence of binding or roughness. Turn bearings by hand -
if bearings are in good condition, rotation will be smooth. The outer main bearing may be removed and
replaced if necessary. To install new bearings, heat inside bearing race with a heat gun or set bearing on light
bulb, then press them onto the crankshaft.
(2) Inner Main Bearing and Labyrinth Seal.
These bearings cannot be removed - if these are damaged, replace crankshaft assembly.
(3) Rod Side Play.
Check lateral movement of connecting rod as shown below. If side play stays within the 0.016 to 0.020
inch (0.047 to 0.051 cm) range, end play is within allowable limits.
4-392
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