Valve Tapping source??

bobbycoke

bobbycoke

Senior Member
On my way home from this years new england meet in sturbrige mass. was about 120 miles into a 150 mile trip. I had just run up route 30 vt. to Bromley mountain and had no problem after cresting the hill on a long downhill run into manchester I let her run up in speed [about 60 mph I guess, speedo not working] which is something I never do and around 3/4 the way down developed a Tapping noise.... It ran fine the rest of the way home with the exception of this newly acquired "TAPPING" sound at any speed. When I got home checked oil and it was down about 1/2 qt which is normal for a long [150+] drive as the engine has some blowby when working a steep grade. Tried listening with a country stethscope [ soild piece of steel] and bottom end sounds OK, I believe it is in the valve train, it still runs fine, what should I look for to check out the noise ie: valve spring,tappet etc.I know the engine probably needs a freshing but was hoping to do that in winter of 2011-12 as time and budget allow.Any advice of where to look first will help... bobbycoke:confused:
 
if your sure every thing else is ok i believe one of the adjustable valve lifters has loosened up, your going to have to pull the side valve cover and run a feeler gage till you find the loose one
 
Center main bearing?

Put the stethoscope on the nuts for the center main bolts and see if it's louder than the nuts on the end main bearing bolts. Noises in the engine can be tricky to pinpoint because sound travels so well through steel and iron.
 
lol, this is the problem trying to dianose an engine problem over the internet, a knock to one person may sound like a tapping noise to another, a valve tap to me is a higher pitched noise, like tap tap, a main bering knock is a deepr sound something like thunk thunk, check all the suggestions, do that and you will find the problem
 
Long shot, you say the speedo not working, is the cable still in the housing? Is it possible, if it is still in there and possibly rounded off at the end but catching on connection at speedo?
Paul in Ct
 
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