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 TM 55-1905-219-14-8
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 bearings 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.
4-390
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