TM 5-3895-346-14
CRANKSHAFT
ENGINE OVERHAUL
WARNING
Be absolutely sure the engine is securely attached to the stand before releasing
the lifting sling. Severe injury to personnel and destruction of engine parts will
result if the engine breaks away from the stand.
7. Remove the oil pan.
8. Remove the oil pump inlet pipe and screen.
9. Remove the flywheel and flywheel housing.
10. Remove the crankshaft pulley.
11. Remove the front engine support.
12. Remove the engine lower front cover and oil pump assembly.
13. Remove the cylinder head(s).
14. On the V-type engines, remove the main bearing cap stabilizers.
15. Remove the connecting rod bearing caps.
16. Remove the main bearing caps.
17. Remove the thrust washers from each side of the rear main bearing.
18. Remove the pistons, connecting rods, and liners.
19. Remove the crankshaft, including the timing gear (Fig. 2).
20. Refer to Timing Gear for removal of the crankshaft timing gear and Oil Pump for the procedure covering
removal of the oil pump drive gear.
Figure 2. Removing or Installing Crankshaft
Inspection
After the crankshaft has been removed, clean and inspect it thoroughly before reinstalling it in the engine.
Remove the plugs and clean out the oil passages thoroughly with a stiff wire 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, if necessary.
If the crankshaft shows evidence of excessive overheating, replace the crankshaft since the heat treatment has
probably been destroyed.
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