My tensioning method is to go driving on a rainy day, with heater booster,
headlamps, radio and anything else electrical switched on, then to listen for
belt slip or other indications of slip. I tighten just enough to stop that.
TDsâ?? belts are the older-style wider belt. Mine I would tighten just enough
to keep it from flipping off the dynamo pulley.
MGB workshop manual says, somewhere, 1/2â?? deflection on the longest span.
At what pressure, one asks. I think that is generally over-tight, and believe
that that spec was set for dealer use so that cars were not returned for
no-charge tightening in a couple of weeks after belts were renewed. Only my
opinion on that.....
O Fahrenheit yesterday morning in Guilford. Too cold to consider taking MGB
outside, even if the garage door had not been frozen closed.
Bob
> On Jan 22, 2019, at 3:24 AM, PaulHunt73 <paulhunt73@virginmedia.com> wrote:
>
> I took the suggestion as being an easier way to arrive at the correct
> tension, not a method of over tensioning it. However I've only ever had to
> do it after having refitted the dynamo or alternator after other work, so in
> the grand scheme of things it's not been that big a deal. Other than that I
> don't adjust the belt from one years end to the next, just checking, and I've
> never suffered from squeal or poor charging from that cause. I'm looking
> forward to the discussion about what the tension should be and where and how
> it is measured :o)
>
> PaulH.
>
> ----- Original Message -----
>> Itâ??s easy enough to cobble oneâ??s own, using a quality turnbuckle
>> (rigging screw) from a marine supply source.
>> I question the need, though, as our dynamos have notoriously weak rear
>> bushings, and over-tightening the belt puts unnecessary strain on the
>> bushings.
>
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