Vanos rattle in my '08' 525i E60 N52 engine - Bimmerfest - BMW Forums



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  #1  
Old 08-17-2019, 07:58 PM
karolh karolh is online now
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Vanos rattle in my '08' 525i E60 N52 engine

Guys I need your assistance. My '08' 525i E60 with it's N52 engine just turned 62,000 miles and 2 days ago I started hearing a rattling sound at the top front of the engine which I suspect is coming from the Vanos. The car has posted no error codes and it still runs okay but there is a noticeable lack of power during acceleration. It starts just like normal but a few seconds after start up the rattling sound trips in and the idle become a bit erratic and then settled back down. This problem is new to me so I am not sure not to deal with this issue and so I would appreciate your suggestions and advice on how to deal with it. Thanks.

Last edited by karolh; 08-17-2019 at 08:00 PM.
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  #2  
Old 08-17-2019, 08:20 PM
dharmabmw dharmabmw is offline
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It depends on whether it's the inboard or outboard vanos. If it's inboard you have to remove the manifold for access.
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Old 08-18-2019, 04:29 AM
karolh karolh is online now
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What causes the Vanos to rattle, is it a reduced oil pressure caused by a faulty solenoid ? I have been told that cleaning the solenoids sometimes cures the rattle.
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Old 08-18-2019, 06:08 AM
twh twh is online now
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Quote:
Originally Posted by dharmabmw View Post
It depends on whether it's the inboard or outboard vanos. If it's inboard you have to remove the manifold for access.
You are thinking of something else - DISA maybe?.

Both Vanos solenoids are at the front of the engine and are accessible.

Quote:
Originally Posted by karolh
What causes the Vanos to rattle, is it a reduced oil pressure caused by a faulty solenoid ? I have been told that cleaning the solenoids sometimes cures the rattle.
If that is what's causing the problem, yes, lack of oil pressure could do it. There is a well know issue where one of the cam bearing ledges wears out and that decreases the oil to the solenoid. But, the solenoids are electromechanical devices. More likely they are worn out. You can try and take them out and clean them in brake cleaner. It isn't hard. They aren't real expensive.
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Old 08-18-2019, 05:30 PM
karolh karolh is online now
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So I removed both solenoids and noticed that they had a fair amount of residue on them. I gave them a good clean and reinstalled them and the rattle went away for all of about 20 minutes of driving. Based on this, is it fair to assume that the solenoids are possibly worn out and need replacing. This is the route I am planning on taking before doing anything more and see what gives. Also, which brand of solenoids do you recommend as suitable replacements.
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Old 08-18-2019, 08:00 PM
twh twh is online now
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When I changed them on wife's X5, I used genuine BMW. I've seen a thread in the forum where the person used Dorman and that person said there were the same OEM manufacturer. I don't imagine more that one or two companies make them.
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Old 08-19-2019, 04:26 AM
dharmabmw dharmabmw is offline
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Quote:
Originally Posted by twh View Post
You are thinking of something else - DISA maybe?.

Both Vanos solenoids are at the front of the engine and are accessible.



If that is what's causing the problem, yes, lack of oil pressure could do it. There is a well know issue where one of the cam bearing ledges wears out and that decreases the oil to the solenoid. But, the solenoids are electromechanical devices. More likely they are worn out. You can try and take them out and clean them in brake cleaner. It isn't hard. They aren't real expensive.
Doh! Serious brain fart happening on my part. Another thing to check are the check valves on the passenger side of the block. If you have had extended your oil change intervals, they could be clogged with sludge or the valve seats could be worn allowing leakage. Replacement is the best option for these parts.
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Old 08-19-2019, 05:24 AM
karolh karolh is online now
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Thanks for that additional tip about the check valves....will check on them for sure.
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Old 08-19-2019, 07:53 AM
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Useful test sequence for Vanos system:

https://us.autologic.com/news/bmw-va...and-diagnosing
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Old 08-19-2019, 08:40 AM
karolh karolh is online now
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Banglenot, thanks for that link. So far no codes have been displayed so hopefully that is a good sign. I did a search on the internet for suitable replacement solenoids and saw a host of very cheap priced made in China units which I intend to steer clear of. I plan on getting some genuine BMW units as replacements as I plan on keeping this car for a while yet as it's a sweet driving unit and this is basically the first semi major problem it has ever given me.
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Old 08-29-2019, 05:49 PM
karolh karolh is online now
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It's been a few days since I last posted here regarding my Vanos issue so here is an update on it. I purchased two Gates Solenoids and installed them. I also removed the engine oil check valves which on inspection were quite clean, but I still gave them a good clean and put them back in. The noise from the Vanos disappeared for awhile but is back now, intermittently and not as loud as before. At this point I am somewhat at sea as to my next line of action and would appreciate some more suggestions / assistance.
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Old 08-29-2019, 08:10 PM
dharmabmw dharmabmw is offline
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I think I replaced my check valves at around 280,000 km. Mine looked okay as well but I had previously replaced both vanos solenoids and continued to have codes appear as well as timing issues. Replacing the check valves solved the issue.

It was particularly bad in the winter due to some -40 weather, but that's another story.....
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Old 09-03-2019, 05:32 AM
karolh karolh is online now
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Latest on my problem is that I bit the bullet and took the car into a well recommended local BMW repair shop yesterday to have the necessary repairs done. Am expecting to hear the results of their investigations and the way forward today and will update here.
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Old 09-06-2019, 05:35 AM
karolh karolh is online now
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Took the car into the local BMW repair shop and the diagnostic report showed that the oil seperator valve which has been giving a whistling sound like a peanut cart is shot and needs replacing. Unfortunately in the N52 engine the valve is an integral part of the valve cover ( thanks BMW engineers) so I have to purchase a new cover for US$500.00 to replace a $40.00 valve. Hopefully this will solve my problem.
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Old 09-06-2019, 05:38 AM
twh twh is online now
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There are hacks that can be done on this part without replacing the valve cover.

Some threads on this site you should be able to find.

Basic instructions:
https://vanos-bmw.com/product/111275...53-11127548196

You can get the part on eBay and Amazon also. Go to Amazon and search for "bmw pcv valve". It's the little cap thing with the reddish diaphragm. Make sure you get the one for your car.

Last edited by twh; 09-06-2019 at 05:44 AM.
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  #16  
Old 09-06-2019, 05:47 AM
karolh karolh is online now
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Yes, I have heard about the hack that can be done to the valve cover but most do not recommend it as a good permanent fix, so I have opted to replace the cover. Hopefully this one will outlast my tenure with the car.
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  #17  
Old Yesterday, 05:16 PM
karolh karolh is online now
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Eventually got the new valve cover installed and at the same time replaced the metal cam sealing rings with the re-engineered Teflon replacements so as to guard against the original metal rings cutting grooves in their lands. The frustrating peanut cart whistling sound is finally gone and the engine's normal power is back...it's almost unbelievable how docile the car had become as once again its really fun to drive. My thanks to all who assisted me in arriving at a happy ending.
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  #18  
Old Yesterday, 07:37 PM
twh twh is online now
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replaced the metal cam sealing rings with the re-engineered Teflon replacements so as to guard against the original metal rings cutting grooves in their land
Please post a link to the part.
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Old Today, 05:07 AM
karolh karolh is online now
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https://www.ecstuning.com/b-genuine-...317587757~oeb/
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