TM 5-3805-261-34ENGINE TROUBLESHOOTING AND MAINTENANCE PROCEDURES.MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONj.MECHANICAL NOISE IN ENGINE.Step 3.Check the crankshaft.If the crankshaft is damaged or defective--contact General Support.k.FUEL CONSUMPTION IS TOO HIGH.Step 1.Check the fuel injection nozzles.If the fuel injection nozzles are damaged or defective--service or replace. Refer to paragraph 3-24.Step 2.Check the fuel injection timing.If the fuel injection timing is not correct--adjust. Refer to paragraph 3-27.1.LOUD NOISE FROM VALVES OR VALVE DRIVE COMPONENTS.Step 1.Check the valve springs.If the valve springs are damaged or defective--replace. Refer to paragraph 3-13.Step 2.Check the valve lifter.If the valves are not moving freely--replace valve lifters. Refer to paragraph 3-12.Step 3.Check the valves.If the valves are damaged or defective--replace. Refer to paragraph 3-12.Step 4.Check the camshaft.If you suspect a problem with the camshaft--contact General Support.3-9
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