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TM 9-2815-226-34-2
c. Repair oil plug drain hole.
NOTE
Two oversize plugs are available to permit rethreading of drain hole at least twice.
Plugs come in 1-1/4 in. (31.75 mm) and 1-3/8 in. (34.92 mm) oversizes.
(1) Install 1-1/4 in. (31.75 mm) oil drain plug.
(a) Enlarge damaged hole by drilling to 1-11/64 in. (29.77 mm).
CAUTION
USE LUBRICANT WHEN TAPPING TO PREVENT TEARING OF METAL.
(b) Tap hole with 1-1/4 in. X 12 tap.
WARNING
COMPRESSED AIR USED FOR CLEANING PURPOSES WILL NOT EXCEED 30 PSI
(207 KPA).  USE ONLY WITH EFFECTIVE CHIP GUARDING AND PERSONAL
PROTECTIVE EQUIPMENT (GOGGLES, SHIELD, GLOVES, ETC.).
(c) Clean out tapped hole with compressed air.
(d) Install new drain plug with new copper gasket.
(e) Torque plug to 60 - 70 ft lbs (81 - 95 Nm).
(2) Install 1-3/8 in. (34.92 mm) drain plug.
(a) Enlarge damaged hole by drilling to 1-19/64 in. (32.94 mm).
(b) Tap hole with 1-3/8 in. X 12 tap.
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