The true, honest-to-god, canonical answer is:
The belt has to be just tight enough so that there is no slippage on any
of the pulleys--inc. the generator under load--and no tighter.
I've always used about a half-inch of depression when pushing down on
the belt segment between the water pump and the generator using nominal
pressure.
Definition of 'nominal' is left as an exercise for the reader.
bs
On 10/4/2018 7:31 AM, Bruce Steele wrote:
> So I recently had to as the list a similar question. I had forgotten about
> the adjusting nut on the swing arm! With the car on 4 jack stands, I ended
> up using a 1x3 placed under the generator and used my small floor jack to
> ease the generator up until I was happy with the belt tension, which I
> checked using a homemade gauge and a hook (see attached photo). I slip the
> hook between the belt and the timing chain cover and check it midway between
> the crank and generator pulleys.
>
> Bruce Steele
> Brea, CA
> 1960 BN7
>
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