Re: tracking down ticking noise

Posted by HH56 On 2019/5/8 13:19:49

If the valve spring has lost some tension that might let a lifter extend more than it normally would so that a valve might hit. Valve spring height and strength is one of the things suggested to check during valve jobs so that issue must have come up before. As you said, a defective lifter could possibly not be draining off the prescribed amount and instead keeps "pumping up". If the oil pressure is higher than expected that might also affect a lifter -- particularly if it is marginal -- although I would expect more than one might act up if that were the case.