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 TM9-2815-224-34&P
Engine Block Maintenance Instructions (Cont)
ENGINE BLOCK REPAIR (CONT).
3-2.
(23) Use bore gage to measure each main bearing bore (12) diameter. If main bearing bore diameter is
less than 4.812-in. (122.22 mm) or is greater than 4.813-in. (1 22.25 mm), replace engine
block ( 1).
(24) Remove five main bearing caps ( 10) and screws (11).
(25) Inspect dowel holes in engine
block (1) for oversize holes or damage.
Replace engine block if damaged or
oversize.
(26) Inspect threaded holes for stripped or
crossed threads. Use a tap to clean up
threads.
(27) Inspect machined surfaces for
flatness, burrs, and scratches. If
surfaces cannot be cleaned up by
lapping, replace engine block (1).
3-10
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