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Daniel Wilson
Daniel Wilson,
Category: Medium and Heavy Trucks
Satisfied Customers: 4373
Experience:  Owner at DJ Wilson
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I HAVE AN ISM CUMMINS WITH A POP IN THE ROCKER HOUSING. I CHECKED

Customer Question

I HAVE AN ISM CUMMINS WITH A POP IN THE ROCKER HOUSING. I CHECKED THE OVERHEAD AND CHECKED FOR ANY BROKEN SPRINGS. WHAT ELSE COULD I BE MISSING
Submitted: 7 months ago.
Category: Medium and Heavy Trucks
Expert:  Daniel Wilson replied 7 months ago.
Hi my name is***** kind of pop? Like a knocking in the upper end? Could be an injector knock if the rocker arms and valve clearances check good. Let me know
Customer: replied 7 months ago.
It is a pop/ cracking noise only at high throttle. The valve lash is correct
Expert:  Daniel Wilson replied 7 months ago.
Thanks for the update. Are there any fault codes logged? Do you have access to Cummins Insite to monitor live data ? What is the complete engine model and serial number from the ID tag? It sounds like a possibly injector sticking
Expert:  Daniel Wilson replied 7 months ago.
First verify you have no restrictions and are not sucking in air on the suction side causing a starvation of fuel to the injectors when the fuel demand is higher or under a load. Install a clear hose inline to watch for bubbles