I have a 1991 300SE, The Air pump bearings have failed for the last time, I recall there is a serpentine belt that fits the engine with the pump removed. If anyone has an idea what size it is I could use the information.
Thanks in advance; Mike

6PK X 2257

Is for engine without airpump but with aircondition.

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600SEL '91
300E 4Matic '88
240D '83
280SE '77
350SE '73
The most complex systems can fail in the simplest way.
Contra verbosus noli contendere verbis, sermo datur cunctis, animi sapientia paucis.

i don't believe in the lord! He's never bought me a Mercedes Benz.

Mike, I think Hitman runs that setup; might drop him a private msg if he doesn't see this post. I keep the air pump unplugged on mine, so only the idler bearing is turning. That bearing is pretty cheap and relatively easy to replace - though it does seem to go away every 7 years or so. I've replaced it a couple of times and it's beginning to make a little noise again. but if you want to try that route, you can do a search herein for the bearing number and source.

DG

My 86 300e has a 90 124 engine w/ air pump, the bearing went and I removed the pump went to napa got a new belt 2273 mm and can't get it on! Help