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it is not the valve adjustment, it is not the chain tensioner,
You should drain the oil and see if there is any debris on the drain plug .
Also more info would help...the rpm is too low-why ....and also sounds like a rod noise..
Do you hear it when cold only or hot as well?
Ivan
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1985 911 with original 502 191 miles...808 198 km
"The difference between genius and stupidity is that, genius has its limits". Albert Einstein.
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