The complete automotive resource for buyers, sellers, and owners like you.
Car, Truck and SUV Forums at Roadfly
+ Bentley Forums
+ BMW Forums
+ Cadillac Forums
+ Chevrolet Forums
+ Ferrari Forums
+ Jaguar Forums
+ Lamborghini Forums
+ Lotus Forums
+ Mercedes-Benz Forums
+ Maserati Forums
+ MINI Forums
+ Porsche Forums
+ General Discussion
+ Marketplace Forums
Re: ticking/tapping noise (archive)
[ Follow Ups ] [ M5 (E28) Message Board ] [ Msg. Board FAQ ]
Posted by Neil Deshpande on November 26, 2001 at 22:03:38:

In Reply to: ticking/tapping noise posted by Randy on November 21, 2001 at 02:21:27:

Randy:

I have no experience with bearings in the engine and the theories put forward sound plausible. It is relatively easy to check big-end bearings via the sump and the small end bearing might have left some powdery residue in the oil filter. Did you check that? I once saw an E30 M3 with brassy residue in the oil filter at Putnam Park, but I don't think the bearings are brass. Could have been the wrist pin which likely is brassy? I'm not sure, but check the oil filter for signs and also have the oil analyzed. $25 will buy you a kit for the latter and the analyzing company will tell you what metals they found and what is wearing out abnormally.

What condition is your tensioner in? Could it be that it is allowing the chain to whip excessively and allow gentle contact between pistons and the plug?

Also, what of carbon on the piston top? You can remove the plugs and look into the cylinder and see the state of the piston top. The contact between metal and carbon is unlikely to be noisy though.

Neil Deshpande
http://www.neilwerke.com

***


Hello! This is a follow up question answered by Ian. My M5 has 230,000+ miles on it. It consumes only 1/2 quart of oil every 2,500 miles. I've thought of rebuilding or at least a valve job, but mechanics say "if it isn't broken...don't fix it!" Through the years (I've owned car since new) I have been noticing a light metallic tapping that is in sych with engine speed at any temp. At first I though it was a maladjusted valve. I have also been told that it is a normal noise fuel injectors make. A week ago my #3 sprark plug broke while accelerating at 6,000 rpms. It caused the car to misfire and replacing the plug seemed to solve the problem. The ceramic surrround was chipped and the electrode bent to a "no gap" configuration. Now, I swear the tapping noise is MUCH louder! I'm afriad something horrible has happend and the M5 is ready to die?! The car seems to be running fine although I haven't applied full throttle yet. Ian sugested getting a compression check done. I will also do a visual inspection of the valve train. Any ideas what my be wrong with my baby?

Follow Ups:


[ Follow Ups ] [ M5 (E28) Message Board ] [ Msg. Board FAQ ]
Questions, comments, or problems, please visit the Roadfly help desk.
Roadfly.com Logo © 1997 - 2009 Jump Internet Inc. All rights reserved.