TM 5-4320-302-145-2. SYMPTOM INDEXRefer to the Symptom Index below. Locate the malfunction which is the same, or most nearly thesame, as the trouble you are having with the centrifugal pump unit. The Symptom Index lists thefirst page of troubleshooting information for that malfunction. Follow the steps one by one, and per-form the corrective actions listed.MalfunctionNumberDescriptionPage1Engine fails to crank or cranks at low speed5-22Engine cranks but fails to start5-23Engine starts but runs unevenly, stalls, or surges5-34Engine stops running or produces black, white, or grey smoke5-45Engine consumes excessive lube oil5-56Pump does not discharge or has low discharge pressure5-57Pump makes excessive noise5-5Table 5-1. Direct Support TroubleshootingMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1. ENGINE FAILS TO CRANK OR CRANKS AT LOW SPEEDStep 1. Check for faulty starter motor. Remove and test (para 5-18).Repair faulty starter motor (para 5-18).Step 2. Check for restricted impeller.Remove volute (para 5-4) and remove foreign objects restricting impeller.2. ENGINE CRANKS BUT FAILS TO STARTStep 1. Check for loose cylinder head bolts.If loose, tighten in a crosswise manner with socket spanner No. 120040/120050 to 22 ft lb (30 N.m).Using torque gage 101900,tighten bolts three additional45 degree increments.5-2
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