Alternator belt 10x1035 or 10x1037 or something else?

[raslaje]

1985 300D Turbo

Fastlane shows 10x1037 for the alternator belt.
http://catalog.peachparts.com/ShopByVehicle.epc?q=1985-Mercedes--Benz-300d-Drive--Belts&yearid=1985@@1985&makeid=63@@MERCEDES+BENZ@@X&modelid=6193%3AMBC|1504%3AED|10000135@@300D&catid=242346@@Drive+Belts&yearid=1985%40%401985&makeid=63%40%40MERCEDES+BENZ%40%40X&modelid=6193%3AMBC|1504%3AED|10000135%40%40300D&catid=242346%40%40Drive+Belts&subcatid=242349@@Accessory+Drive+Belt&mode=PA

AllParts Express shows 10x1035 for the alternator belt.
http://www.allpartsexpress.com/ShopByVehicle.epc?q=1985-MERCEDES--BENZ-300dt--/--L5--998cc--3.0l--Diesel--Fi--Turbo-Belts&yearid=1985%40%401985&makeid=MERCEDES+BENZ%40%40MERCEDES+BENZ%40%40X&engineid=1193790%40%40300DT++%2F+L5-2998cc+3.0L+DIESEL+FI++Turbo%40%40300DT&catid=Belts%40%40Belts&subcatid=Alternator+Belt@@Alternator+Belt&mode=PA

A review of the various threads on replacing this belt seems to indicate that various sizes have been called out but no clear consensus as to the correct one.

[JimmyL]

I'll muddy the waters a bit. My '81 takes an 1100mm alt belt.
Tightened it today as a matter of fact. Tired of it squealing randomly!

[300SD81]

I don't think it matters, 2mm longer or shorter makes zero difference since the adjustment nut can move several cm...

[aaa]

85 uses shorter belts than 82-84, and the nonturbos (81 & before) use one fatter belt instead of two.

The number 1000 is sticking in my head for 85, with 1035 being for 82-84.

Edit: nevermind, it's only the 85 300SD for the shorter belt.

[raslaje]

Originally Posted by 300SD81

I don't think it matters, 2mm longer or shorter makes zero difference since the adjustment nut can move several cm...

I think you're right. It's the "something else" that got me spooked. Some couldn't get the "correct" alternator belt on without removing the pulley or replacing with a longer "wrong" belt. But I think they were 300SDL's or 300TDT's. I just wanted to add 2 belts to a small order to make shipping a smaller dollar percentage cost and keep as spares until spring.