Strange noise from Left bank of M62 engine

Thanks very much guys..

Blade - its very hard to determine where the whine is coming from. At 2000 theres a fair bit of other noise going on in the engine bay, but it almost sounds about half way down the length of the engine to me.....possibly even coming from lower the the heads.....but i could be totally wrong.

I Dont think its going to be not enough tension in the chain. Theres certainly no rattling or anything like that, and when i had the valves covers off (exposing the vanos units and chain), there was plenty of tension in the chain.

Philip - The M62 only has one tensioner, which is bolted into the right hand upper timing cover. It is a brand new tensioner. I could swap this out back to my old one, which could potentially loosen it off a little. Id be comfortable doing this as it has brand new guides and a new chain so very little chance of it jumping, plus the original tensioner isnt that bad.

I have thought about the left bank being starved of oil. It seems to be OK for the first little bit (about 3-4 minutes), and then seems to make the noise only at slightly higher RPM. Im not sure though. I took the valve covers off and there is certainly enough oil sitting in the heads.

Can anyone tell me a way i could confirm if the left bank of the engine is receiving adequate oil flow?.

Dave

Dave
Some other points to look at!

This doesn't seem to be your problem, but some L322's had different dipsticks (prob BMW ) that indicated oil was full, but it wasn't due to the bigger sump on the L322.

The non-return valve behind the VANOS might be U/S ? Remove the solenoids and renew all the O rings. Also the non-return valve on the oil filter housing has been know to fail! Though it would cause the whole motor to be noisy.


I would next check the cam-shafts on that bank still having issues and see if their having any problems. Shirley had noise problems in her motor and this what it turned out to be.

Hope you can find the cause !

Laurie

Thanks for the reply Laurie!!.


I had my cousin around yesterday, and whilst not a mechanic, he (like me) very much enjoys rebuilding engine etc in his spare time, so has good mechanical knowledge.


He seemed convinced it was something to do with the oil filter arrangement. I held the car at about 2000-25000 RPM, and he was certain the noise was coming from somewhere under the left head, around where those oil lines marry up to the block (on some adapter plate).


I was also thinking about the non-return valve behind the vanos, and think its a good idea. I shudder at the thought of pulling all that stuff off the engine again!!!.


I have another car exactly the same ( not running), so I think it may be time to start swapping parts externally (oil filter housing etc) and see if I can pin point it.


Again - if anyone has any ideas - please please let me know!.


Dave

Did you set up the VANOS as per the manual?
It has to be in a certain place in its travel etc.

Regards philip A

Hi Philip.

I setup the vanos units as per the besian instructions, which stipulate that the vanos unit itself has no relative positioning on the camshaft?.

I did ensure the center piece of the vanos was rotated as far as it could go counter clockwise before I tightened everything.

I also also purchased the bmw timing kit so have all the relevant specialty tools to set the timing correctly.

Can you elaborate on your comment about the vanos having to be in a certain place in its travel? Just to ensure I have understood you correctly.

Many thanks!

Dave

Quote:

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Can you elaborate on your comment about the vanos having to be in a certain place in its travel? Just to ensure I have understood you correctly.

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No I really cannot remember, as I sold my M3 about 6 years ago. I just had a vague recollection that it had to be in a certain position.
Regards Philip A

hi guys,

Just wanted to update this to post what i believe was the solution, after running the car last night for about 20 minutes with no noticeable noise.

As much as i had replaced the timing guides, chain, done the vanos repairs etc, i had NOT done an oil change, or a filter change (was still waiting for them to arrive in the mail).

Last night the oil and filter finally arrived. I drained all the old oil out (very black and thick), and removed the lower sump. Was not surprised at all to find pieces of guide in there.....i was expecting that. However what i also found was an almost completely blocked oil pickup. Wedged almost fully with very small pieces of plastic guide. The pickup surface was extremely reduced.

Spent an hour or so cleaning it all out (with the vanos right angle pick would you believe). Managed to get all the pieces out, put it back together with new oil and a new filter, and hey presto.......silent as a mouse all the way through the rev range.

So, i guess at the end of the day it must have been a starvation issue of sorts.

A simple fix at the end of the day, and had i ordered my oil and filter to arrive sooner, i never would have had the issue in the first place!.

Thanks to everyone for your input. Forums like these are an absolute goldmine.

Dave

Good to hear.
It's always nice to find the solution.
The RR fights to live another day. :-)

I hope the noise was the only starvation problem---:o