SERIES 60 ON-HIGHWAY ENGINE OPERATOR'S GUIDE All information subject to change without notice.
109 DDC-SVC-MAN-0039 Copyright © 2009 DETROIT DIESEL CORPORATION Hard Starting Symptoms and Probable Causes Probable Causes Engine Will Not Rotate Low Cranking Speed Engine Cranks But Will Not Start Low Battery Voltage X X — Loose cranking motor connections X — — Faulty cranking motor X X — Faulty cranking motor switch X X X Internal seizure X — — Improper lube oil — X — Circuit breaker/electronic control malfunction — — X Fuse blown or missing — — X Insufficient Fuel Supply Air in fuel — — X Out of fuel — — X Loose fuel connections — — X Cracked fuel lines — — X Obstructed fuel filters/lines — — X Faulty fuel pump — — X Faulty injector operation — — X Restricted fuel fitting missing — — X DDEC Malfunction — — X Installation/operation of fuel check valve or shutoff valve — — X Low Compression Worn intake and exhaust valves — — X Worn piston rings/liners — — X Leaking cylinder head gasket — — X Improper intake or exhaust valve adjustments — — X