Has anyone ever changed an alternator and belt tension wheel in a Z3?


Asked by Jul 25, 2010 at 05:39 AM about the BMW Z3

Question type: Maintenance & Repair

I tell you...That alternator and belt tension wheel in my Z3 looks impossible to swap out.  It looks like I need a special tool!  Anyone here ever done it?

2 Answers


It's pain in the ass. You need to remove most of your obstacles from the bottom. If you have access to a lift then use a lift, it's almost impossible in the driveway.

1 of 1 people found this helpful.

yes several times.you need a t-50 torx socket or a 40 dont remember he exact size.pull out the idler pulley should have a cover on it.pop it off then there is a 16mm i believe.disconnect the connector on the back of the alternator and positive cable .i dont disconnect the battery but you.take off the belt.take off the alternator bolts and may need to pry it off.should be 2 on the bottom and the one for the idler pulley goes throuh it.the tensioner might be mechanical or hydraulic.either or not hard to replace.

1 of 1 people found this helpful.

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