TM 10-3930-671-24 Troubleshooting Guide Starting  fluids  or  aids  such  as  ether  or  gasoline  must  not  be  used  in  a  diesel engine air intake system. The use of these fluids will cause severe internal engine damage and/or bodily injury. A. Engine Won’t Turn Over 1. Dead or weak battery Recharge or replace battery. 2. Inadequate battery capacity Replace battery. 3. Poor ground connection Inspect, clean, tighten ground cable. 4. Loose or faulty wiring connections Clean, tighten, repair connections. 5. Starting switch faulty Replace switch or relay. 6. Faulty neutral start switch Replace. 7. Starter motor defective Check  brushes,  commutator,  drive  spring,  and  mounting  bolts (ground). 8.     Internal engine seizure Turn  engine  manually.  If  unable  to  do  this,  check  for  foreign objects in gears, on top of piston, or for piston seizure. B. Engine Turns But Won’t Start 1.     Fuel shut-off solenoid failure Using voltmeter, check solenoid with key switch in RUN position. If  voltage:  replace  solenoid.    No  voltage:  check  for  opening  in wiring to solenoid. 2. No fuel supply to pump Fill fuel tank or open shut-off valve. 3. Air in fuel injection lines Check connections and bleed fuel system. 4. Clogged or dirty fuel filters Disassemble and clean primary filter and replace secondary filter if clogged. 5. Air filter plugged Replace. 6. Cranking speed slow (under 250 rpm) Recharge    or    replace    battery;    check    starter    and    repair,    if necessary. 7.     Water in diesel fuel Drain   fuel   system;   refill   with   clean   fuel   or   strain   fuel   through chamois and bleed system. 8. Wrong injection pump timing Retime pump to engine per specifications. 9. Low compression pressure See recommendations under item G. 10.  Glow plugs faulty or inoperative Replace or repair. F-68