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In Reply to: Re: About antennas: read on, this may be your prob posted by Patrick on December 21, 2000 at 11:34:48:
When I took my antenna apart, I noted that the power was transferred between the motor and the pulley via a belt (made by Continental actually). I noted that under load, the belt would slip, not pulling down on the antenna. I got away with cleaning up the belt and pulleys to remove any grime that accumulated, but I suppose that replacing the belt would have been the better option. If you find a source for that belt, let us know!! Good Luck
Patrick
'84 733i
Lots of our old bimmers have the half-up antenna blues, and I think I'm one step closer to a diagnosis...
Well, a little engineer's curiosity got the antenna somewhat apart, and here's what's going on. This is a common problem, and I think based on what I may have found, people are buying new antenna motors when all that needs fixed is a clutch mechanism that runs the pulley for the antenna mast cable.
Here's how it went: I took the thing out and to a workbench, took the cover off, fed it power from a battery, and sure enough it worked fine in both directions. Flawless, so far. Then I fed it the cable for the antenna. It took it about 3 inches, and wouldn't take it any more, as it curved it around the pulley and down so it can wrap around the axis of the pulley. And when this happened, the pulley stopped though the motor was STILL TURNING, which means there is a clutch in there. It's probably there to keep the motor from overheating should the antenna reach it's limits of extension or otherwise get gummed up and difficult to extend.
SOOO, Does anyone have any idea how to tighten this clutch? Anyone here done this before?
I'd love to hear your replies, especially if you have any ideas, but certainly to check my logic.
Back to the workbench, but if you know what's happening in this thing and how to tighten the clutch, please reply.
James Lee
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