TM 9-2350-256-20CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS2 - 1 6 . 1 M E C H A N I C A L T R O U B L E S H O O T I N G - C o n t i n u e dE N G I N E - C o n t i n u e dQIf during battery test battery voltage was below 12volts and starter still tried to turn over engine,starter protection module may be defective,troubleshoot engine starter circuit (see paragraph 2-19). Replace starter module if defective (seeparagraph 6-3).RCheck engine for proper grade of oil. If wrong gradeof oil for prevailing temperature is in engine do thefollowing: Use external means to heat enginecompartment. After engine starts, run it until enginereaches operating temperature. Drain engine and/ortransmission and fill with proper grade of oil forprevailing temperatures as specified in TM 9-2350-256-10.SWhile assistant engages starter, listen at vehicle rightrear cooling air inlet grilles for a spinning noise. Ifspinning noise is present, replace starter assembly(see paragraph 6-3).F U E L , A I R I N T A K E , A N D E X H A U S T S Y S T E M SSYMPTOMSEngine starts running but fails tostay running.Do steps A through E.Engine fails to shut off whenengine fuel shutoff switch isactivated.Do step F.Engine fails to stop when fuelshutoff handle is pulled.Do step G.Engine stalls at low rpm, does notdevelop full power, and hasexcessive smoke from one or bothbanks of cylinders.Do steps H and I.Engine stalls at low rpm and doesnot delvelop full power, butexhaust smoke is normal.Do steps J through M.Engine runs rough or misfires,knocks, and/or fuel consumptionis excessive.Do step N.AWith MASTER switch and in-tank fuel pump switchin ON position, electric fuel pump will make a noise.If there is no noise, troubleshoot electric fuel pumpcircuit (see paragraph 2-19). If there is noise go tostep L and perform fuel flow test.BDisconnect fuel line connecting primary fuel filterand main fuel check valve at main fuel check valve.Place fuel line in a suitable container. Place MASTERand fuel pump switches in ON position. If there isno fuel flow, clean filter and/or replace the prirmaryfuel filter element (see paragraph 4-14).2-40.4Change 1
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