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I had my radiator fail last week. I have always had a little knock in the engine, but now I have big knocking sound. I had the head pressure test in each tested to 150 PSI. I have replaced the radiator and still have the knock sound. Any suggestion on what this might be, possible valves? Thank you in advance..

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Sounds like you are due for an engine overhaul, you have a connecting rod knocking if it varies with engine speed (unloaded) or you have a main bearing knocking if it varies with load and rpm. Let me know if the knock is down low or closer to the head..I doubt it valves...you have an engine that needs an overhaul.

Bulldog

Posted on Jul 24, 2008

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