Centinel System – Repair Manual – Engine Will Not Crank or Cranks Slowly (Air Starter)

Air pressure is low in the air tanks

Increase air pressure with an external air source. Refer to the OEM service manual.

Engine-driven units are engaged

Disengage engine-driven units.

Lubricating oil does not meet specifications for operating conditions

Change the oil and filters. Refer to Procedure 018-003 in the Operation and Maintenance Manual, Signature and ISX Engines, Bulletin 3666251 and 018-003 in the Operation and Maintenance Manual, Industrial and Power Generation, QSX15 Engines, Bulletin 3666423. Use the oil type recommended in Section V of the engine operation and maintenance manual.

Starting motor is malfunctioning or starting motor is not correct

Check the starting motor operation. Compare the starting motor with the engine and vehicle specifications. Refer to the OEM service manual.

Starting motor pinion or ring gear is damaged

Remove the starting motor, and inspect the gear. Refer to Procedure 013-020, 016-005, and the OEM service manual.

Crankshaft rotation is impaired

Check the crankshaft for ease of rotation. Refer to Procedure 001-016.

Hydraulic lock in a cylinder

Remove the injectors and rotate the crankshaft. Look for the source of fluid in the cylinder. Refer to Procedures 006-026 and Procedure 001-016.

Internal engine damage

Analyze the oil and inspect the filters to locate an area of probable damage. Refer to Procedure 018-003 in the in the Operation and Maintenance Manual, Signature and ISX Engines, Bulletin 3666251 and 018-003 in the Operation and Maintenance Manual, Industrial and Power Generation, QSX15 Engines, Bulletin 3666423.