Usually when you hear a squeak from an engine you assume it’s the belts. drdiesel had a Chevrolet Avalanche in their shop that had a squeaking noise coming from the engine when it was running… but it wasn’t the belts. They posed the question to the community, and with the help of fellow community member dmckemie12 and others, they were able to resolve the issue.
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2003 Chevrolet Avalanche 1500 5.3
Squeak From Engine, Replaced Rocker Arm
Squeak or rubbing noise from right side cylinder head valve train area, only with engine at operating temperature..
Bad roller bearing in rocker arm.
You can pull the valve cover then plug the coils back in and run the engine, use a hammer handle and push hard on the push rod side of rocker and listen for noise change. You can also back the rocker bolt out a turn or two and SLOWLY tighten back down, noise will get louder when tightening if the roller on lifter and/or cam is bad. I’ve got a pickup load of bad cams from these same symptoms.
Replaced rocker arm, ran engine and squeaking noise is gone.
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