BMW M5 Forum and M6 Forums banner

I think she has a boo boo

2K views 19 replies 8 participants last post by  tomloans 
#1 ·
Well I think I broke something. I came around a corner and had the car in 3rd (thought I was in 2nd) and stepped on it. It didn't like it at all. Lugging and jumping.

Now I have a somewhat light rattling/grinding sound coming from what I believe would be the transmission or possibly the back of the engine. Only can be heard at idle speed with or without the clutch in or in gear or out of gear. I wouldn't call it a knocking sound. I can feel it in the stick shift. I can hear it in the cab and underneath the car. I have the Magnaflow exhaust set up so it is quite loud but I can still make it out. It somewhat melts away and blends in with higher revolutions.

So did i hurt my rod bearings or did I break my transmission/clutch/flywheel somehow. I should have been more sensitive to her feelings.

156,000 miles on a 2001 Lemans blue beast.

Thank you for any advice you might have.

Tom
 
#6 ·
Did they do the pilot, throwout and clutch fork pivot pin?
Do you have more effort at the pedal now?

Sounds like when I had a partially sheared pivot pin .. I was a few clutch pushes away from failure when I did the clutch job on my E36. I believe the design is similar in the S62 but haven't been inside mine yet.
 
#7 ·
Well the only way to be sure is to drop the tranny - prior owner had the work done and I don't have the receipt. I believed him because the clutch is strong and fresh. I've driven a number of these beasts prior to purchase and with one where the clutch was completely worn out. Big difference.

The pedal seems the same.

The wierd part is that when I give it a little gas I can still hear hit and the noise doesn't change. It doesn't get louder or faster just the sound of the engine eventually drowns it out. I may be wrong about this but that what it seems like. If there is a change it is subtle.

On a different topic... Since I have 156k on the vehicle, the concern is rod bearings. I have been reading some of the posts and the scary part is that according to some posts, once the symptoms of worn bearings show up, it is often too late and a lot of damage is caused.

Should I have them done as preventative maintenance. Is there an efficient way to test for bad bearings?
 
#9 ·
If you need a good shop, Performance Technic would be the place I'd go...

Copper will be the wear metal in an oil analysis if the bearings are worn. The only other way to tell is to pull the upper oil pan and look, and then at that point you should just change them because that's where most of the labor is anyway...
 
#10 ·
Performance Technic is great. I had them do some work on my M3 . Also Evan over at performance autowerks in Dublin. I ordered an oil kit and should have that tested within 3 weeks. I am going to run it over to Evan afterwards and have him look at it. Have another issue that is also odd.

August, would love to have you listen to it. I am going to send you a private message with my info. Let's see if we can meet. My office is in Pleasanton.
 
#13 ·
Hey guys, here is the weird part or maybe one of the weird parts. No noise when cold, only after warm uo. Also I put a stethoscope to the water pump and I think it may be coming from there but why would I feel it on the stick shift and hear it in the cab. I am sending an oil sample to verify that the rod bearings are not going out. I I will let you all know.
 
#16 ·
There are not very many bearings in engine and the ones off the top of my head only make noise under load. For instant rod bearing like to start making noise at 2500 rpm. Appears you might be thinking to much about it and not testing enough. Lots of bearings in the accessories why not start by pulling the belts off and see if the noise is still there.

Personally my money is on the oil pump chain tensioner from the description of when it started and how it behaves. After the belts dropping the oil and pan to have a look for plastic bits and inspect the oil tensioner is pretty basic. If you can't do those two basic things then get the car to someone who can, because without exploration we are just flapping keyboards or gums for those that talk and type.
 
#17 ·
Yep I hear u. I put the stereoscope to the back of the water pump and the noise was there but unsure if it is picking up the noise from below or from a different area. When it gets a little warmer I will take a closer look. This is the first I have heard of the oil pump. I am relatively new to this car. I do almost all my own work as I have a 740i and an M3 e46. So just trying to get a feel for it before I do a bunch of work for nothing.

Thanks for your feedback.
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top