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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 05-01-2016, 12:14 PM   #1
S.A. Singer
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Join Date: Apr 2015
Location: Durham, NH
Posts: 44
My Ride: 330xi
Turning the camshafts by hand

If I have the crankshaft 30 degrees out of TDC (against the direction of normal motion), can I freely turn the camshafts without worrying about valve-piston interference?
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Old 05-01-2016, 06:05 PM   #2
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Join Date: Sep 2009
Location: Australia
Posts: 396
My Ride: 330 CiC, 330i
Yes you should be able to do this. Take it slowly though. Any interference and you will immediately feel it, but with the crank geometry, it shouldn't be a problem at 30 deg.
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Old 05-02-2016, 09:36 AM   #3
S.A. Singer
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Join Date: Apr 2015
Location: Durham, NH
Posts: 44
My Ride: 330xi
So for anyone in the future reading this: I can confirm that there was no interference.

It turns out that the machinist mixed up the intake and exhaust cams, always be sure to double check things like that!
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camshaft, interference, rotate, valve

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