414TATA Posted December 10, 2017 Share Posted December 10, 2017 Or is it Tap Tap Taping? The noise my 248 CI straight 8 is making on cold start up. No mechanic here so stay with me. I am thinking (hoping) it needs a valve adjustment. The noise subsides when the engine warms up but can still be heard just not as loud as start up. What do you think? lifter problem? valves need adjusting? or?? car has 32,000 original miles. It's been making this noise for about 400 miles now. I have had no engine work since purchased at 24,000 miles. Oil has been changed every year or approx 1,000 miles. Thanks for the help Wayne 1941 Super Link to comment Share on other sites More sharing options...
Morgan Wright Posted December 10, 2017 Share Posted December 10, 2017 It can't hurt to adjust the valves. Real easy to do. Link to comment Share on other sites More sharing options...
MCHinson Posted December 10, 2017 Share Posted December 10, 2017 I would suggest either a valve adjustment is needed or perhaps there is a bit of a partial plug of the oil line feeding the valve train. You can easily diagnose either of those by removing the valve cover and taking a look. Link to comment Share on other sites More sharing options...
LAS VEGAS DAVE Posted December 10, 2017 Share Posted December 10, 2017 Possible wrist pin bushing. Link to comment Share on other sites More sharing options...
Guest Posted December 10, 2017 Share Posted December 10, 2017 If you blip the accelerator and the noise is louder on deceleration it very well could be a wrist pin bushing. When I had a wrist pin knock on my Buick the old time mechanics said to leave it until I had another reason to open the engine. They said it was common and could come back again fifteen or twenty thousand miles after being repaired. Several years later I collapsed a piston (#2) and at that time fixed the wrist pin bushing (#6). Link to comment Share on other sites More sharing options...
KongaMan Posted December 10, 2017 Share Posted December 10, 2017 Could be your exhaust. Make sure your manifold bolts haven't come loose. In order to narrow it down, an assistant and a mechanic's stethoscope, length of heater hose, or long screwdriver can be real helpful in finding the source of the noise. 1 Link to comment Share on other sites More sharing options...
Gary W Posted December 10, 2017 Share Posted December 10, 2017 My buddy John uses a wood broomstick. He holds the top to his right ear, and as he guides the pointed "business end" of the broomstick around the block, he'll touch low to hear any crankshaft noises, higher for wrist pin, piston slap, valve tap. Generator bearings, water pump bearing... Amazing how clear the sound comes through the wood pole. Link to comment Share on other sites More sharing options...
Daves1940Buick56S Posted December 10, 2017 Share Posted December 10, 2017 I use an old window squeegee with a long wooden handle. The horizontal metal part that holds the squeegee rubber fits nice up to your ear. Link to comment Share on other sites More sharing options...
414TATA Posted December 11, 2017 Author Share Posted December 11, 2017 Thanks for the help Gents. Link to comment Share on other sites More sharing options...
Larry Schramm Posted December 11, 2017 Share Posted December 11, 2017 A wooden "yard stick" also works well. If you slip and it hits something moving it just breaks and hopefully will not hurt you. 1 Link to comment Share on other sites More sharing options...
Marty Roth Posted December 11, 2017 Share Posted December 11, 2017 Years ago I had a friend who used 1/2 inch socket multiple extensions against his ear- at one point he toughed a spark plug wire end- biggest shock of his young life ! Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now