TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
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TM 9-2320-361-24-1 0008 00 0008 00-9 MECHANICAL SYSTEMS TROUBLESHOOTING - DIRECT SUPPORT (Contd) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 12. EXHAUST COLOR WHITE DURING NORMAL OPERATION AND IDLE (Contd) 3. Test run vehicle after replacing cylinder heads and gaskets. If exhaust color remains white, internal engine block cooling jacket failure is indicated. 2. If coolant is present on oil dipstick, check intake manifold and gaskets for defects. See WP 0008 00, table 1, malfunction 1, step 11. 3. If coolant is present on dipstick, check cylinder heads and gaskets for defects. (WP 0027 00). Replace engine (WP 0046 00). 13. ENGINE OIL PRESSURE LOW OR ZERO AT NORMAL OPERATING TEMPERATURE CAUTION Do not operate engine except during testing when condition of no oil pressure is evident. Continued operation may damage engine internally. 1. Check oil pressure regulator for leaks or defective operation. Remove oil pressure regulator and inspect for defects (WP 0037 00). NOTE When oil pump operation or condition becomes defective, usually there is a lack of oil supply or restriction from oil sludge. 2. Remove oil pan and oil pump and inspect for defects (WP 0035 00 and WP 0036 00). 3. Check oil pick up for restrictions. NOTE Lack of oil supply due to oil pick up restrictions reducing or cutting off oil supply may cause damage to main and rod bearings, crankshaft, and rods. 4. Inspect crankshaft for nicks, burns, scuffs, or discoloration due to overheating. If oil pressure regulator is defective, replace (WP 0037 00). If oil pump is defective, repair or replace (WP 0036 00). Do not install oil pick up or oil pan when reinstalling oil pump. If oil pick up is restricted, clean or replace (WP 0036 00). Do not install oil pan when reinstalling oil pickup. Replace engine if crankshaft is damaged (WP 0046 00). Table 1. Engine Troubleshooting Procedures (Contd).