Where to start with Vanos maintenance? - Page 2 - BMW M5 Forum and M6 Forums
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post #11 of 34 Old 15th March 2019, 08:22 PM
sreten
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Damn, that sucks to hear. I just ordered all of the parts to retrofit new accumulator. Mine is 09/2000, no rattle when cold but very annoying startup rattle when warm.

What's the production date of your car? Maybe you need DME update to activate the function?

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post #12 of 34 Old 15th March 2019, 08:46 PM
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Originally Posted by sreten View Post
Damn, that sucks to hear. I just ordered all of the parts to retrofit new accumulator. Mine is 09/2000, no rattle when cold but very annoying startup rattle when warm.

What's the production date of your car? Maybe you need DME update to activate the function?

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Accum won't fix that. Possible board maintenance will, but in all likelihood you have a pintle in a noid not sealing correctly. Just from experience, sometimes it is just crud so cleaning the noids really well may cure that.
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post #13 of 34 Old 15th March 2019, 09:28 PM
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I did Vanos solenoid maintenance back in May when I bought the car.

What I gathered from older Vanos accumulator threads is that chances are 50/50 that new accum does the trick. I remember Vantaam5 posts saying that new Vanos spring plates almost always cure the startup rattle.
I have no running issues but I'm planning to overhaul Vanos next winter when I don't drive the car that much.

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post #14 of 34 Old 16th March 2019, 12:48 AM
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The issue with the rattle has always been a lack of oil in the front of the piston in the cars I have worked on. There might be other reasons but that is all I have ever seen. No oil means the piston taps on the cover. If your solenoids don't leak then there will be oil, if they leak there will be none. The oil is the cushion so the piston can't tap on the cover. Even if you have done the maintenance that does not mean that there is not a leaking noid at it's pintle.
Personally I have put 4 accums in for people and none has done anything. If I sort through the noids and put all the ones that leak on the inlet side no more diesel rattle, or very minimal. If I replace all the leaky noids then there is never a rattle. My car gets the boards pulled as soon as I hear a rattle more than once and I always find something. I am in the unusual situation of having more than a few spare noids and diodes around from when I was fixing these boards for people.
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post #15 of 34 Old 16th March 2019, 01:17 AM
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We are talking just about few seconds startup rattle when the engine is warm, right?
That's the only rattle I'm experiencing at the moment. When it sits overnight and the engine is cold, there's no startup rattle and at idle it sounds normal. Just like every S62 I've heard so far.

My first 05/2000 had the same symptoms, the 2nd 05/2001 had none of this.

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post #16 of 34 Old 16th March 2019, 02:03 AM
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Yep, when the oil is warm it will leak out easier. The reason I know this or discovered it, was when I did boards for people I ended up putting them in my car to test. It was a pain that is why I stopped. My car came with dirty boards I figured out the cleaning/repair procedure and put them back in an all I had on the second warm start was a slight rattle. Thought that was normal. Once I started putting other boards in my car to test I found out it was not normal. Some boards no rattle some different rattles including cold. Any that rattled I knew I had more work to do.
Rattle is a board issue, and the accum was a bandaid fix by BMW that never really worked, fixing the boards works but sometimes that means replacing one or more noids. The noids where never designed for this much work, they are ABS noids. The pintle seal area gets hammered and when there is crud getting hammered often a small leak is created once the crud is removed. It truly is unimportant but the rattle bugs people, it does no harm.

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post #17 of 34 Old 16th March 2019, 02:15 PM
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Thanks for sharing your experience.

I know that it's harmless, even says that in the BMW service bulletin for the new accumulator but when you park and restart the car later, the racket is unbearable. Funny thing is that it doesn't always happen but rather sometimes.

I already bought parts for the new accum install so I'm committed at this point. I'm curious to experience it firsthand and new parts won't hurt anything else than my wallet.

When I run DIS Vanos test, the bank 2 passes every time while bank 1 fails either at inlet advance or exhaust advance by 0.1-0.2 deg.







I pulled bank 1 solenoids again last week and gave them a good clean to see if it will make any difference. The brake cleaner was shooting out nicely on all 4 solenoids and I used air compressor 115 psi to blow them out. The clicking while opening and closing sounds good to me across the board. Didn't make any difference and test results were the same.

I can try swapping solenoids from bank 2 to bank 1 but this likely has something to do with timing and not solenoids. I have no codes and the car is running perfectly so I'm not gonna chase a problem where there isn't one. DIS test is sensitive anyway and I can try your advice to hold the rpms higher and it might pass but I didn't try this yet.

I'm slowly doing research and collecting notes to overhaul Vanos units next winter, install updated spring plates and check cam timing. Car is at 111k miles and I think it would benefit from this.

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post #18 of 34 Old 16th March 2019, 04:26 PM
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Yeh that small amount is nothing to worry about. Have you replaced your lower timing chain tensioner?
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post #19 of 34 Old 16th March 2019, 04:31 PM
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I did back in May when I got the car. One of the first things I always replace on an M5. 4 new CPS as well.

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post #20 of 34 Old 18th March 2019, 11:16 PM Thread Starter
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While we're on this topic, is this ~5 degrees of exhaust leak test deviation anything to worry about? This is with freshly rinsed-out solenoids with new seals :/
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