TM-9-2815-202-34 Technical Manual for 8V71T Engines for M109 Howitzer Download
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TM9-2815-202-34 4-35. CRANKSHAFT MAINTENANCE (Cont) c. Cleaning ● ● WARNING Dry cleaning solvent P-D-680 is toxic and flammable. Wear protective goggles and gloves and use only In a well-ventilated area. Avoid contact with skin, eyes, and clothes and don’t breathe vapors. Do not use near open flame or excessive heat. The flash point is 100 o F-138 o F (38°-50 o C). If you become dizzy while using cleaning solvent, get fresh air immediately and get medical aid. If contact with eyes is made, wash your eyes with water and get medical aid immediately. Compressed air used for cleaning purposes will not exceed 30 psi. Use only with effective chip guarding - and personal protective equipment (goggles/shieid, gloves, etc). (1) Clean all crankshaft oil passages thoroughly with cleaning solvent and dry with compressed air. (2) Clean front and rear crankshaft gears with cleaning solvent. d. Inspection (1) inspect gear teeth for evidence of scoring, pitting, and wear. If severely damaged or worn, replace gear. (2) Inspect crankshaft keyways for evidence of cracks or wear. Replace crankshaft if required. CAUTION ● ● (3) Replace crankshaft if it shows evidence of excessive overheating since heat treatment has probably been destroyed. Ridges on crankshaft journals must be removed. If ridges are not removed, localized high unit pressures are placed on new bearing shells and short bearing life can result. Inspect crankshaft journals for ridges and grooves. Ridges exceeding 0.0002 inch must be removed. NOTE Replace crankshaft if journal ridges are greater than 0.001 inch in depth. (4) Remove crankshaft journal ridges by working crocus cloth, wet with fuel oil, around circumference of journals. if ridges are greater than 0.0005 inch, first use 120 grit emery cloth to clean up ridges, 240 grit emery cloth for finishing and wet crocus cloth for polishing. 4-154