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 00-11 MECHANICAL SYSTEMS TROUBLESHOOTING - DIRECT SUPPORT (Contd) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 14. ENGINE OIL PRESSURE EXTREMELY HIGH AT NORMAL OPERATING TEMPERATURE 1. Check oil pressure regulator for leaks or defective operation. NOTE Continued high oil pressure may indicate engine bearings are spun, the engine block oil feed is restricted, or the return passages are restricted. 2. Disassemble engine and check for spun bearings or restricted oil passages. Remove oil pressure regulator and inspect for defects. If oil pressure regulator is defective, replace (WP 0037 00). If evidence of spun engine bearings or restricted oil passage is found, replace engine (WP 0046 00). 15. ENGINE OIL LOSS DURING NORMAL OPERATION 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). 2. Remove and inspect oil cooler for leaks, restrictions, or defects. 3. Remove and inspect turbocharger for internal and external oil leaks. (WP 0057 00). 4. Check fuel injection pump for external oil leaks. 5. Complete troubleshooting. See WP 0008 00, table 1, malfunction 11, test 1. 1. If oil cooler is restricted, clean. 2. If oil cooler gasket is defective, replace (WP 0038 00). If oil is present inside turbocharger housing, on hub fins, or externally on housing, but not in area of oil inlet or outlet parts, replace turbocharger (WP 0057 00). If fuel injection pump is leaking oil, replace (WP 0069 00). Replace defective components as necessary. Table 1. Engine Troubleshooting Procedures (Contd).