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20-63.  MAIN BEARING AND CRANKSHAFT REPAIR
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TM-9-2320-364-34-4 Palletized Load System (PLS) M1074/M1075 Manual
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TM 9-2320-364-34-4 20-200 20-63.  MAIN BEARING AND CRANKSHAFT REPAIR (CONT). b. Cleaning/Inspection. Fuel is very flammable and can explode easily.  To avoid serious injury or death, keep fuel away from open fire and keep fire extinguisher within easy reach when working with fuel.  Do not work on fuel system when engine is hot.  Fuel can be ignited by hot engine. (1) Clean crankshaft (1) and bearing caps (2) with diesel fuel and cleaning cloth. (2) Flush oil passages (3) in crankshaft and clean using a stiff wire brush. (3) Visually inspect crankshaft (1) for signs of overheating.  Replace crankshaft if journals have turned blue from heat. (4) Inspect crankshaft connecting rod journals (4) and main bearing journals (5) for deep scratches.  Replace crankshaft if damaged. (5) Inspect connecting rod journals (4) and main bearing journals (5) for signs of cracks at connecting rod journal oil holes (6) or at joining points (7) of connecting rod journal and main bearing journals.  Replace crankshaft if damaged. (6) Inspect crankshaft keyways (8) for cracks or gouges.  Replace crankshaft (1) if damaged. (7) Inspect rear oil seal contact surface (9) for deep scratching.  If scratches cannot be smoothed out with crocus cloth, replace crankshaft (1). (8) Inspect crankshaft thrust surfaces (10) for grooving.  Replace crankshaft (1) if deep grooves have been scratched into thrust surfaces. NOTE Timing gear was removed from crankshaft during crankshaft removal. (9) Inspect timing gear (11) for chipped teeth. Replace if damaged.

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