As long as I’ve owned my Crestline, there has been a knocking noise evident at idle. It is relatively minor, but consistent. As soon as engine speed increases a bit it is drowned out by fan noise, etc, so it doesn’t get any louder and the only time I can ever perceive it is below about 1000 rpm. It seems to be most audible near the timing cover. It does not sound like any kind of valve train noise. It has not changed at all over the 2-3000 miles I have driven since purchase. Changing oil viscosity from 10w-30 to 15w-40 has made no difference.

What does this sound like to you?



1954 Crestline Victoria 312 4-bbl, 3-speed overdrive