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TM-9-2320-361-24-1 Page 102

TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks

Page 102 of 1176


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TM 9-2320-361-24-1 0006 00 0006 00-6 MECHANICAL SYSTEMS TROUBLESHOOTING - UNIT (Contd) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 9. EXCESSIVE OIL LOSS OR CONSUMPTION DURING NORMAL OPERATION (Contd) 6. Check oil pressure. Oil pressure should be 40–75 psi (275–517 kPa) at 2,600 RPM. If oil pressure is still too high or too low, replace engine (WP 0046 00). 10. ENGINE OIL PRESSURE TOO LOW OR TOO HIGH AT NORMAL OPERATION TEMPERATURE CAUTION Do not operate engine except during testing. Continued operation without proper oil pressure may damage engine internally. 1. Check engine oil level (WP 0020 00). 2. Check engine for excessive engine operating temperature (TM 9-2320-361-10). 3. Check that engine oil grade is correct for vehicle use and climate conditions. 4. Check operation of oil pressure gauge (WP 0014 00, table 1, malfunction 4). 5. Check all external oil and fuel lines for leaks or restrictions. 6. Check oil pressure. Oil pressure should be 40–75 psi (275–517 kPa) at 2,600 RPM. If oil level is low, check for external oil leaks at oil pan, drainplug, oil filter, oil filter housing, oil cooler, oil dipstick tube, rocker arm cover, and turbocharger. If engine temperature is above correct operating temperature, see WP 0006 00, table 4, malfunction 1. If engine oil grade is incorrect, replace oil (WP 0020 00). 1. Replace inoperative oil pressure gauge (WP 0095 00). 2. If oil pressure gauge has maximum reading of 60 psi (413 kPa) and needle peaks at 60 psi (413 kPa), replace with new oil pressure gauge (range 0–120 psi) (WP 0095 00). Repair leaks or clear restrictions. If oil pressure is still too high or too low, replace engine (WP 0046 00). 11. EXCESSIVE VIBRATION OR CLUNKING 1. Check engine mounts and pads for looseness or damage. 2. Check mounting of transmission to engine. 3. Check jackshaft for loose or missing hardware. 4. Check torsionel damper for loose hardware or damage. If engine mounts or pads are damaged, replace (WP 0024 00 and WP 0025 00). Replace missing screws or tighten loose screws (WP 0132 00). Replace missing hardware and tighten loose hardware. Tighten loose torsionel hardware and/or replace damaged components. Table 1. Engine Troubleshooting Procedures (Contd).