ARMY TM 9-6115-604-12
NAVY NAVFAC P-8-633-12
4-60. SIGHT GLASS. The sight glass assembly (Figure 4-44) is mounted on the left side of the radiator, near the top of
the unit. The sight glass assembly is provided with half-inch NPT fittings on each end to facilitate replacement. It is used
to visually monitor coolant level within the radiator.
Refer to paragraph 3-12. Drain the engine and radiator until no coolant is present at the lowest point of the
Loosen nuts (4, Figure 4-44), and remove sight glass (5), rubber preformed packings (2), and brass washers
Remove top elbow (1) and bottom elbow (6) from the radiator.
Remove drain (7).
b. Repair. Install new rubber preformed packing and install new sight glass.
Figure 4-44. Sight Glass Assembly