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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > VANOS Solenoid Teardown / Repair



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      12-21-2016, 04:58 PM   #1
aymen_a22
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Since my N52 E90 developed a vanos issue I tried the usual cleaning procedure to try and sort out the problem. After the repair failed twice I finally decided to get a new solenoid valve.

I then decided to pull the old unit apart to see how it works, and I discovered that it is remarkably simple and easy to do.

Please note that I take no responsibility for your actions if you use the information I provide, I am simply documenting the information for anyone who might be interested.

1:
There are two metal tabs on the base of the electrical connector. I used a screw driver to pry up the tabs and then pliers to bend them out the way.

2:
Use a flat screw driver to pry the electrical connector assembly out of the housing.

3:
Clean the assembly with your favourite cleaning product. I used thinners that evaporate leaving no residue.

4:
Use an air line (high pressure) to blast any particles out of the unit. This should also remove any remaining cleaning products.

5:
Carefully re-assemble the unit and bend the tabs back down to fasten the electrical connector to the body.


I hope this is helpful for someone out there. I have not yet put mine back in the engine but I will probably ring home swap it with the old one that I didn't replace to see if it worked.
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      12-21-2016, 11:56 PM   #2
kkasson
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Nice job. How did the metal tabs feel...do you think they'll be likely to break when bending them back or did they feel solid?

Looks simple enough that a thorough cleaning should get it working well again. Looking forward to see what happens you put it back in the car.
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      12-22-2016, 02:45 AM   #3
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Thanks very much.

The tabs seem fairly robust. They probably wouldn't take being done too many times though.

One thing I noticed was that the unit was filled with oil when I took it apart, I believe it is supposed to be flooded as there is a second o-ring inside the unit.

I also noticed that after cleaning and reassembling the unit, it rattled when I shook it. The new unit also rattled so it much be a good thing.

My fault was only "stiff or mechanically sticking" so may well be sorted.
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