TM 5-3805-262-203-7. COOLING SYSTEM TROUBLESHOOTING (CONT)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION3. COOLING SYSTEM NOT PRESSURIZED (Cont).S t e p 1 . ( C o n t ) .NOTEI t m a y b e n e c e s s a r y t o r e i n-s t a l l r a d i a t o r c a p s e v e r a ltimes to ensure tight seal.O p e r a t e p r e s s u r e t e s t e rpump and watch meterr e a d i n g a t i t s h i g h e stpoint. Cap release pres-sure should be 6-1/2 to7-1/2 pounds, and shouldremain steady for at least30a .b.seconds.If radiator cap pressure is 6-1/2 to 7-1/2 pounds, and remainssteady for at least 30 seconds before dropping, go to step 2 be-low.If radiator cap pressure is not 6-1/2 to 7-1/2 pounds, or ifp r e s s u r e d r o p s r a p i d l y , r e p l a c e r a d i a t o r c a p.Step 2.Disconnect cap adapter from pressure tester.A t t a c h p r e s s u r e t e s t e r t o r a d i a t o r f i l l e r n e c k , w i t h l o c k i n g e a r s inline with entrance notches of filler neck,Press down on tester and rotate clockwise until locking ears arestopped by stop lugs on radiator filler neck.Clamp radiator inlet and outlet hoses, or block hose flanges.Operate pressure tester pump until meter indicates 10 poundssure, and watch meter.a .b.c.If pressure drops quickly, radiator has serious leakage.r a d i a t o r ( p a g e 4 - 8 0 ).If pressure drops slowly, radiator has seepage or slightage. Replace radiator (page 4-80).p r e s -Replacel e a k -If pressure holds steady for two or more minutes, radiator checkis satisfactory. Remove pressure tester from radiator.3-59
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