I was planning to install the dampner pulley from a 85TD onto my 1.9
converted Vanagon which has the stamped steel pulley when I saw a potential
problem. The stamped pulley has 2 belt grooves which are the same size with
only the outer one being used going to the water pump. The dampner pulley
from the TD has 2 belt grooves also but the outer one is smaller diameter
which would cause the water pump to spin faster and thus the alternator to
spin faster. One solution would be to run a one-belt system using the inside
pulley, partially wrapping the water pump pulley, and adjusting at the
alternator. However, I've been told that the one belt system doesn't contact
the water pump sufficiently on Vanagons  and may cause overheating from belt
slippage. Is there a solution to this problem?
Thanks,

Ken Hunter
82 Westy 1.9D
84 Jetta 1.5D