Vanos board maintenance needed? - BMW M5 Forum and M6 Forums
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post #1 of 4 Old 15th May 2017, 01:52 AM Thread Starter
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Vanos board maintenance needed?

While waiting for my new water pump parts to arrive, I thought I'd check some maintenance items off my list & the vanos was readily accessible. I don't have any errors related to vanos and I found (to my great surprise) there are no leaks ... as the pics show. So my question is on whether I should proceed to do board maintenance? Opinions appreciated.
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post #2 of 4 Old 19th May 2017, 03:47 PM
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I would go ahead and do it. It's not that hard. Just make sure you really, really clean out the solenoids with brake fluid or something similar. You really want them to make a loud clicking sound, but you also really need to make sure they're dry to make an accurate assessment. Sometimes when the brake fluid is still inside they will click nicely, only to gum up again when dry. It takes a lot of fluid. I really thought I did a great job but I still failed the vanos test in DIS by about 5%. Don't worry about damaging the brown rings with the screens. You'll be throwing them out anyways.

Also make sure you get the soldering right. Vanos is a critical piece of the S62 puzzle and if you're ever trying to diagnose another issue down the road it's a good to know 100% that the vanos is in working order. I really didn't know how to tell if my soldering was any good so I made this thread. I hope this helps and good luck.
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post #3 of 4 Old 20th May 2017, 05:58 AM Thread Starter
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Thanks for the encouragement - I have mostly done the board maintenance and am really glad I did.
Removing the solenoids was not too bad as I followed the advice on levering with a screwdriver on a neighboring solenoid and the lower slot on the solenoid being loosened.
Removed the filters - almost nothing left of them. I cleaned the solenoids using QD Electronic cleaner and compressed air and am getting good strong clicks now. I re-flowed the solder joints and spotted what I think might have been a dry joint (?). I added a bit of copper wire between the two terminals I was joining. Anyway, they are almost ready to reinstall! In case someone wants to do this too, I measured the resistance across each solenoid and found between 3.6 and 3.8 ohms. I was really double checking that I had not bridged any of the gaps between terminal pairs.

I guess that the bottom line is that despite looking pretty minty (with just the covers removed) and no vanos errors, its still advisable to do this maintenance. And not too difficult :-)
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Last edited by michaeldch; 20th May 2017 at 06:01 AM.
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post #4 of 4 Old 20th May 2017, 04:56 PM
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The bottom photo, you are correct that is a bad joint. If you grabbed that wire with pliers and worked at it you would have it moving in no time.

It is the inside of the noid that will be less than pristine where do you think the fibers from the screen/filters go. No matter how perfect the outside looks.
Nice job.
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