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TROUBLESHOOTING PROCEDURES (Continued) - TM-5-1940-277-34_49
TRANSMISSION MALFUNCTIONS

TM-5-1940-277-34 Boat Bridge Erection Twin Jet Aluminum Hull Model USCSBMK1 (1940-01-105-5728) Manual
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TM 5-1940-277-34 TROUBLESHOOTING PROCEDURES (Continued) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 8. HIGH LUBRICATING OIL CONSUMPTION Step 1. Check for oil in bilge or on engine as evidence of leaking gasket or seal. a. Replace gasket or seal found to be source of leak. b. If no leak evident go to step 2. WARNING Cap under pressure when water hot.  Remove carefully.  Severe burns may result. Step 2. Remove cap from header tank.  Check fresh water for oil film contamination as evidence of engine oil cooler leaking. a. Replace engine oil cooler (refer to TM 5-1940-277-20). b. If no evidence of oil cooler leakage go to step 4. Step 3. Check for excessive crankcase pressure. a. Inspect engine breather hose and trap for excessive oil, an indication of excessive crankcase pressure. b. Excessive crankcase pressure is evidence of faulty piston rings or head gasket. 1. Replace faulty cylinder head gasket (refer to page 2-291). 2. Refer faulty piston rings to General Support. Step 4. Perform compression tests to determine if valves or piston rings are defective (refer to page 2-173). a. Repair or replace valve guides and/or valves as required (refer to page 2-277). b. Report defective piston rings to General Support. c. If compression satisfactory contact supervisor. Change 1 2-15







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