TM 9-2320-272-24-4
5-8. CRANKSHAFT AND MAIN BEARINGS MAINTENANCE (Contd)
c. Installation
WARNING
Eyeshields must be worn when cleaning with compressed air.
Compressed air source will not exceed 30 psi (207 kPa). Failure to
do so may result in injury to personnel.
Ensure main bearing bores (3) of engine block (1) are facing up.
1.
Clean all engine block screw holes (2) with compressed air.
2.
Wipe all engine block bearing bores (3) clean with lint-free cloth.
3.
CAUTION
Touching bearing shell wear surface after shells have been cleaned
will cause shell corrosion, resulting in engine damage.
NOTE
Count new bearing upper shells from front of engine block.
Wipe new bearing upper shells (4) Nos. 1, 2, 3, 4, 5, and 6 (4) clean with lint-free cloth.
4.
Position new bearing upper shells (4) Nos. 1, 2, 3, 4, 5, and 6 (4) in bearing bores (3) with oil holes
5.
(5) aligned and press in place. Apply coat of lubricating oil. Bearing shell (4) will project slightly
above bore (3).
NOTE
Wide portion of upper bearing shell is measured from oil groove to
edge.
Install new bearing upper shell No. 7 (7) in bore (10) with wide portion (8) toward flywheel end of
6.
block (1).
7.
Align new bearing upper shell No. 7 oil holes (9) and press in place. Apply coat of lubricating oil.
Bearing shell (7) will project slightly above bore (10).
8.
Install fourteen new dowel rings (6) in engine block (1).
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