Thread: Strange noise from Left bank of M62 engine

Dave
Check you exhaust manifold gasket for a leak!

Laurie

Hi Laurie,

Thanks for the suggestions. Ive checked all bolts etc around the exhaust manifolds, and done as good a visual inspection as i can with my mirror.

This morning i finally got it all back together after checking the upper timing covers for contact, and checking the guides to ensure nothing had come loose. After letting the car warm up, brought the revs again up to about 2500 rpm, and my noise can clearly still be heard.

Im quite sure the chain is not rubbing on the timing cover, and i really cant see how the tension on the chain could be too tight?. There is no adjustment at all.....its simply held taught by the tensioner. SOme people have suggested the chain may be too tight. But i dont see how that can be the case??

Im pulling my hair out over this one guys. The noise is definitely coming from the left side of the engine, and if i had to choose, id say it was about half way down the engine length. However with all the other engine noise going on at the same time though, its very difficult to tell.

The only guide on the left hand side is a plastic one......dont think the chain rubbing on that would make that noise?

If anyone has any other ideas, or has heard this noise before in their car..........please let me know. Id be very appreciative.

Dave

Here is your answer.
[ame]https://www.youtube.com/watch?v=Jzi_hsPr2js[/ame]
Regards Philip A

Hi Philip,

Thanks for your reply.

It certainly does sound like the same noise, although this engine seems to make the noise at idle, whereas mine is only at slightly higher revs.

Im stunned that it could be the guides though, theyre all brand new??. Is there something i may have done while installing them?.

I took the upper timing covers off and shone my torch in there. The guides are all still in tact and seated properly.

Dave

Hey Dave,

A guy I knew years ago had a similar noise and it turned out to be the Vanos unit failing. Check out the following links if you haven't seen them already on your interweb travels. It may help narrow it down a bit.

http://www.meeknet.co.uk/E31/BMW_M60...ary_Noises.htm

http://www.rangerovers.net/forum/6-r...g-noise-2.html

http://www.bimmerforums.com/forum/sh...only-when-warm


Cheers,

Cripesamighty

Thanks very much for those links cripes!.....

Ive had a read of all of them, and im not feeling as though any of them hit the nail on the head. Primary reason being the noises are quite different, and appear to happen under different situations.

Additionally (and ill do my best to try and explain this)......If i start the car when stone cold, it makes a grindy / whiny noise, but only for literally about 1/2 a second.

Then, if i raise the RPM to 2500 straight away, the noise in posted in my video above does NOT happen.

It only starts happening after about 3-4 minutes of the car running and beginning to warm up.

I must say - ive worked with a lot of engines, but more old school. This is a little more "fancy" than what i'm used to and its really got me miffed.

@Philip - I contacted that youtube user, and he came back to me saying the noise was being caused by his guides being shot, and the metal chain rubbing on the metal guides. This is not the case in my situation. Guides are new and all in tact. I cannot however rule out things being too tight - but didnt think this would be an issue.

Hoping someone can lend a few more ideas..

Regards

Dave

Hey guys.....

One more piece of information which I think i have failed to mention is that this noise is NOT evident at all when the car is at idle. The noise is only evident above about 2000 RPM. Additionally it ONLY happens once the car is started from stone cold, and has warmed up for a few minutes. If started stone cold, and brought straight to about 2000 RPM, the noise is NOT there. Once warm, if i turn the engine off and start it again it is still there (above about 2000 rpm).

This is the last day im gong to be able to work on the car for a little while. So im really hoping someone might have other possibilities that i could have a look at?.

Thanks so much guys. really hoping i can sort this out. Its the only thing i need to do to get the car back on the road!.

Many thanks.

Dave

I'm no expert but could the timing chain tensioner not have the tension it needs or be a bit sticky??
Does it sound like a chain slapping sound?
Or is it more around the valves??