ARMY TM 9-6115-604-12NAVY NAVFAC P-8-633-124-60. SIGHT GLASS. The sight glass assembly (Figure 4-44) is mounted on the left side of the radiator, near the top ofthe unit. The sight glass assembly is provided with half-inch NPT fittings on each end to facilitate replacement. It is usedto visually monitor coolant level within the radiator.a.Remove.(1)Refer to paragraph 3-12. Drain the engine and radiator until no coolant is present at the lowest point of the sight gage.(2)Loosen nuts (4, Figure 4-44), and remove sight glass (5), rubber preformed packings (2), and brass washers (3).(3)Remove top elbow (1) and bottom elbow (6) from the radiator.(4)Remove drain (7).b. Repair. Install new rubber preformed packing and install new sight glass.Figure 4-44. Sight Glass Assembly4-122
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