TM 9-4940-568-20
2-58
Table 2-7. Engine Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
9. ENGINE HARD TO START OR WILL NOT START – SMOKE FROM EXHAUST.
Cranking speed too slow (minimum cranking speed = 150 RPM).
Check battery for 19-24 VDC.
Check the battery, starting motor, and look for loose or corroded wiring connections
(TM 9-4940-568-10).
Bar the engine to check for internal rotational resistance.
Intake air insufficient.
Inspect or replace filter and check for obstructions to the air supply tube.
Fuel injection pump not getting fuel or fuel is aerated..
Check the flow through the filter and bleed the system. Locate and correct the air source
(TM 9-4940-568-10).
Fuel drain back.
Verify fuel return line is plumbed to bottom of fuel tank.
Check fuel hoses and lines for restriction.
Clear any obstructions or debris.
