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Discussion Starter · #1 ·
I have a lifter noise that is only coming from one lifter. It only makes the noise when warm. Engine has fresh oil and it is proper viscocity. I'm at a loss since it's a new noise that the 6.0 is making. Truck has cro moly pushrods and comp cam trunion upgrade kit for the rockers. If you go out and jump on the motor it goes away. Any ideas please help. Pump o ring???

The squeaking in the video is valve train. Belt is totally quite

Shouldn't have to flog the motor to quite it down

Lifter noise:
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