ISBe/ISB Series Engines – Engine Noise Excessive — Combustion Knocks

Fuel grade is notcorrect for the application, or the fuel quality is poor

Operate the engine from a tank of high-quality fuel. Refer to Section V.

Air in the fuel system

Check for air in the fuel system. Tighten or replace the fuel connections, fuel lines, fuel tank standpipe, and fuel filters as necessary.

Electronic fault codes are active

For instructions on how to read active fault codes, refer to Diagnostic Fault Codes in Section 1. If fault codes are active, contact a Cummins Authorized Repair Facility.

Coolant temperature is below specification

Refer to the Coolant Temperature is Below Normalsymptom tree.