What is the correct size dynamo V belt to use for 1600 engine?

[jonat]

Currently I have a toothed Bosch AVX-10x685 in the 1972 1600 engine.

Looking on heritage websites they use 10 X 905.

What is the correct size to use and does it make a difference?

Should it be toothed or flat?

[redhot]

Tooth or flat - I have seen/used both, there are reasons while not critical at all in my experience. Right size first, right tension then, and if anything other there is some variation maybe to tooth vs. smooth, while both shuold work.

https://www.thesamba.com/vw/archives/manuals/Autobahn_Parts_Catalog_1980/Type%201.pdf#page=67

So one size stated for generator and one for alternator

Gen: Belt 9.7x905mm
Alt: 11.3x912mm

This one would assume that pulleys etc. are matching that presumably...

[redhot]

1979 manual; last version and alternator;

[Cusser]

On my 1600cc DP engine with generator, I use IAP 111903137D

111903137D is 905mm x 10mm
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1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297

[Cusser]

On my 1600cc DP engine with generator, I use IAP 111903137D

111903137D is 905mm x 10mm
_________________
1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297

[bsairhead]

It takes about 30 minutes to get the belt to its stretch point. Install it one shim tight or adjust it afterwards.