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Old 12-19-2017, 09:20 PM   #1
1st Gear Newbie
Join Date: Dec 2017
Location: Toronto
Posts: 4
Need help - Vanos timing off?

Hello all. New to the site and forum. Not sure if this is the correct place for this question. If not please let me know.

Just installed a rebuilt vanos unit on 2005 325i E46. Have not started it yet. Problem is I don't know if the timing will be off or not since the secondary chain moved during install. As I was tightening the left head screw on the unit I tighten a bit too much and the piston turned, which also caused the secondary chain to move approx 1 link distance to the left. The other sprocket also turned, but not sure if the vanos piston turned with it since it was not tightened yet. The cams did not move, and the crank did not move only the vanos pistons and secondary chain moved.

Question is: Will the timing of the vanos be affected to the point it may cause a valve to hit the piston. Do I need to remove the unit and reset all the timing or is there some way to turn the chain back 1 notch. Any ideas on how to solve this issue?

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Old 12-20-2017, 10:45 AM   #2
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Better safe than sorry.

Check timing and R&R the Vanos before you put it back together.

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Old 12-20-2017, 05:10 PM   #3
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Join Date: Dec 2017
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You may be right.

Thanks for the feedback. You might be right, better safe then sorry. Hoping to get some feedback from someone that had this very issue or from a mechanic that may know for sure what the effect will be.
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Old 12-21-2017, 07:10 AM   #4
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You should not attempt to do any vanos work without timing tools no matter what you read. Even if it's off by a few degrees, tooth's, turns etc. the compensation factor from the dme is not enough for optimal power.

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