Interesting fact for M127 230SL alt belt - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 06-27-2016, 05:37 PM Thread Starter
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Interesting fact for M127 230SL alt belt

I have been helping a friend and fellow club member with her 1966 230SL.

Fixed an overheating problem with a new thermostat. She noted that a peculiar red light would go on when she started it but would go off when she wrapped it and I immediately suspected the charging system.

Since the light wasn't labeled and she did not have an owners manual from the time she bought it in the 80s we ordered one off eBay for only $90 :-)

Turns out it was the charging system and I ordered a regulator and alternator.

Well to make a longer story shorter when I was taking off the alternator I noticed that that belt. was awfully tight and knew I was going to have trouble getting it back on with the new alternator and pulley.

And so it has been.

I don't know whether a previous shop years ago put on the wrong size belt or it is the proper size belt that's just too darn small.

So I learned it the proper belt is 9.5 mm x 875 mm.

Since my friend lives about an hours drive away I decided just to order a new belt and see if that fits.

But here's the takeaway point and something I found interesting.

I called him MB Classic in Irvine. And was told that that belt dimension is not hard and fast and it frequently when restoring these cars they run into the same situation and simply use one that's 20 or 30 mm bigger

So we'll see.
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Last edited by wlb50; 06-29-2016 at 04:37 PM.
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post #2 of 4 (permalink) Old 06-27-2016, 07:13 PM
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All I can tell you is that the alternator adjustment setup you show in the picture is not as intuitive as I expected. I thought I was loosening my belt on my 1973 450sl with that setup and ended up tightening the setup to the point where I think I bent the alternator.

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post #3 of 4 (permalink) Old 06-29-2016, 04:29 PM Thread Starter
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Hi Fonzie

When I first looked at this set up I didn't quite understand how it tightened it. But right below the adjusting nut is a little square piece (not labeled in above picture) that once tightened with the alternator nut (#3) keeps it in position on the adjustment Rod. (It crimps on locking it to the rod).

I've always disliked having to use a prybar to get tension on an alternator belt and this is a rather elegant solution.

Although it's counterintuitive. You turn the adjustment nut (#2) clockwise to loosen it and counter clockwise to tighten the belt. Turning the nut counterclockwise pulls the alternator out (nut is going up the rod and pulling the alternator out) and thus tightening the belt

Last edited by wlb50; 06-29-2016 at 04:40 PM.
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post #4 of 4 (permalink) Old 06-29-2016, 09:12 PM
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Quote:
Originally Posted by wlb50 View Post
Hi Fonzie

When I first looked at this set up I didn't quite understand how it tightened it. But right below the adjusting nut is a little square piece (not labeled in above picture) that once tightened with the alternator nut (#3) keeps it in position on the adjustment Rod. (It crimps on locking it to the rod).

I've always disliked having to use a prybar to get tension on an alternator belt and this is a rather elegant solution.

Although it's counterintuitive. You turn the adjustment nut (#2) clockwise to loosen it and counter clockwise to tighten the belt. Turning the nut counterclockwise pulls the alternator out (nut is going up the rod and pulling the alternator out) and thus tightening the belt

It sounds like you got it. I simply find myself saying, "WTF? Ok. This way. No wait... That way."

.

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