Figure 15. Keystone-crankshaft, exploded view.
that they are free of nicks, scratches, or burrs.
or burrs. Measure the O.D. and check that it is between
0.5001 and 0.4998 inch.
f. Inspect all cylinder bores to determine that the
internal surfaces are free of nicks, scratches, chipping,
i. Inspect the oil sump of the crankcase (14, fig.
carbon. deposits, or any unusual wear patterns.
16) and determine that the sump is free of dents or
g. Inspect all plungers and pistons to determine
abrasions that might develop into leaks.
that the outside wear surfaces are free of nicks,
j. Inspect ports, bores and pressure relief holes in
scratches, burrs, or carbon deposits. Check that the
the crankcase (14, fig. 16) for cleanliness and clogging.
piston ring grooves are free of carbon.
h. Inspect the outside surface of the piston pin
k. Replace all defective components, preformed
assembly (11, fig. 14) to determine that the pin is round
packings, springs, and parts furnished in the repair kit
and free of nicks, scratches,
allocated to fourth echelon maintenance personnel.
AGO 5548A
25