TM 5-3805-262-203-7. COOLING SYSTEM TROUBLESHOOTING (CONT)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1. ENGINE OVERHEATS (Cont).Step 14. (Cont).T e l l a s s i s t a n t t o s t a r t e n g i n e ; i f e n g i n e c a n n o t b e s t a r t e d , t e llassistant to crank engine for 30 seconds while you watch coolant inwater manifold for air bubbles.a .b .If air bubbles rising in coolant in water manifold are seen, no-tify direct support maintenance to replace cylinder headg a s k e t ( s ) .I f a i r b u b b l e s r i s i n g i n c o o l a n t a r e n o t s e e n , t e l l a s s i s t a n t toshut off engine. Go to step 15 below.Step 15. Test thermostats (page 4-89).a . I f t h e r m o s t a t s t e s t o k a y , r e i n s t a l l t h e r m o s t a t s a n d t h e r m o s t athousing (page 4-89).Connect upper radiator hose to thermostat housing (page 4-75).Fill radiator with coolant (page 4-71).I n s t a l l a n d a d j u s t a l t e r n a t o r d r i v e b e l t s ( p a g e 5 - 5 ) .Install engine left and right side panels (page 9-17).Notify next higher maintenance level (engine must be checkedf u r t h e r ) .b. If thermostats do not test okay, replace (page 4-89).2. ENGINE DOES NOT REACH OPERATING TEMPERATURE.Remove and test thermostats (page 4-87).Replace thermostats (page 4-89).3. COOLING SYSTEM NOT PRESSURIZED.NOTEWith engine at normal operating temperature, run engine at high speedfor two minutes and return to idle speed. Carefully cover radiator capw i t h a c l o t h a n d r o t a t e c o u n t e r c l o c k w i s e t o f i r s t d e t e n t . A h i s s i n gnoise from cap and filler neck indicates that system is pressurized.Step 1. Allow engine to cool and remove radiator cap. Rinse radiator capwith clear water and install on cap adapter and pressure tester asshown.3-58
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