Date registered: Mar 2013
Vehicle: 1996 SL500
Location: Sacramento, California
Mentioned: 12 Post(s)
Quoted: 460 Post(s)
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.
Last edited by wlb50; 06-29-2016 at 03:37 PM.