Engine noise on 3.7L valve knock?

Old 04-03-2024, 02:50 PM
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Engine noise on 3.7L valve knock?

I get this noise when I rev up rpms. Is this a valve knock?

130k miles 3.7l AWD
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Old 04-06-2024, 09:00 AM
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This does sound like my 2012 sounded when the cam lobe failure started, then got worse. I first removed the valve covers and checked to see if any valves were out of spec. None were. With the rocker arm assembly installed, you can't see all the cam lobes. This has to be removed for a thorough inspection. There are specific instructions on how to remove this assembly so you don't over-stress and break the rocker arm assembly due to the spring pressure of the valves that will be open or partially open during removal. This guidance is in the tech manual. Once the rocker arm assembly is removed, you can inspect all the cam lobes for pitting. Any cam with pitting needs to be replaced and the associated rocker arm for that cam lobe, will need to be replaced. IMO, if you can wrench good enough to adjust valves and replace the timing belt on these cars, then you can do this job with the tech manual guidance.
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