section 11E for the procedure covering
sling attached to the lifter brackets at
removal of the oil pump drive gear.
each end of the engine, remove the en-
g i n e from its base.
Inspection
5. Remove all of the accessories and as-
semblies with their attaching parts as
After the crankshaft has been removed,
necessary to permit the engine to be
clean and inspect it thoroughly before
mounted on an overhaul stand.
reinstalling it in the engine.
6. Mount the engine on an overhual
Remove the plugs and clean out the oil
stand and fasten it securely to the
passages thoroughly with a stiff wire
mounting plate (see Figure 11B-5 on
brush. Clean the crankshaft with fuel
oil and dry it with compressed air. Then
reinstall the plugs.
Inspect the keyways for evidence of
cracks or wear. Replace the crankshaft,
B e a b s o l u t e l y s u r e t h e e n g i n e is
if necessary.
s e c u r e l y a t t a c h e d t o t h e s t a n d be-
fore releasing the lifting sling.
If the crankshaft shows evidence of ex-
S e v e r e injury to personnel and de-
cessive overheating, replace the crank-
struction of engine parts will re-
shaft since the heat treatment has
sult if the engine breaks away
probably been destroyed.
f r o m the stand.
Used crankshafts will sometimes show a
certain amount of ridging caused by the
7. Remove the oil pan.
groove in the upper main bearing shell
or lower connecting rod bearing shell
8. Remove the lubricating oil pump.
(see
Figure
11B-70
on
page
11B-47).
Ridges exceeding 0.0002" must be re-
9. Remove the flywheel and flywheel
moved. If the ridges are not removed,
housing.
localized high unit pressures on new
bearing shells will result during engine
10. Remove the crankshaft cap or pulley.
operation.
11. Remove the vibration damper.
The ridges may be removed by working
crocus cloth, wet with fuel oil, around
12. Remove the front engine support.
the circumference of the crankshaft
journal. If the ridges are greater than
13. Remove the crankshaft front cover.
0.0005", first use 120 grit emery cloth to
clean up the ridge, 240 grit emery cloth
14. Remove the vibration damper inner
for finishing and wet crocus cloth for
cone.
polishing. Use of a piece of rawhide or
other suitable rope wrapping around the
1 5 . Remove the cylinder head.
emery cloth or crocus cloth and drawn
back and forth will minimize the possibil-
16. Remove the connecting rod bearing
ity of an out-of-round condition
caps.
developing (keep the strands of rawhide
apart to avoid bind). If rawhide or rope
1 7 . Re m o v e th e main bearing caps.
is not used, the crankshaft should be ro-
tated at intervals. If the ridges are
18. Remove the thrust washers from each
greater than 0.001", the crankshaft may
s i d e of the rear main bearing.
have to be reground.
19. Remove the pistons, connecting rods
Carefully inspect the rear of the crank-
and liners.
shaft in the area of the oil seal contact
surface for evidence of a rough or
20. Remove the crankshaft, including the
grooved condition. Any imperfections of
timing gear and oil pump drive gear.
the oil seal contact surface will result in
o i l leakage at this point.
21. Refer to this subsection for removal
of the crankshaft timing gear and Sub-
11B-46
