TM-9-2815-202-34 Technical Manual for 8V71T Engines for M109 Howitzer Download
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TM 9-2815-202-34 4-32. OIL PUMP REPLACEMENT (Cont) e. Installation (1) (2) (3) (4) (5) (6) (7) If removed, install four studs (8) into main bearing caps (7). Place same number of shims (9) as were removed on main bearing caps (7). Position oil pump assembly (6) over studs (8) and onto main bearing caps (7 and 3). Aline teeth on spur gear (30) with teeth on drive gear (49). Secure oil pump assembly (6) with four Iockwashers (5) and nuts (4). Torque nuts to 26-29 Ib-ft (35-40 N-m). Install two bolts (1) through brackets (2) into rear main bearing cap (3). Torque bolts to 23-26 Ib-ft (31-35 N-m). Aline four brackets (2), eight flat washers (22) and two self-locking nuts (21 ). Torque nuts to 26-29 Ib-ft (35-40 N-m). With engine in upright position, check gear tooth clearance between driven gear (28) and drive gear (49). Using dial indicator (50) mounted on cylinder block, measure clearance. Gear tooth clearance should be 0.006 to 0.012 inch. NOTE Shims control gear tooth clearance. One set of 0.005 inch shims will change gear tooth clearance by 0.0035 inch. (8) If gear tooth clearance is not within specifications, follow steps (a) thru (d). (a) (b) (c) (d) 4-130 Invert engine. Loosen four nuts (4) and two bolts (1). Lift oil pump assembly (6) enough to remove shims (9). Install new quantity or correct thickness of shims (9). Repeat steps (4), (5), and (7).