Charles Harbert wrote:

Russell Kent mentioned that the loss of the vacuum pump would also take out the
alternator.

Russell Kent wrote:

That was in regards to the combined alternator/vacuum pump from Isuzu trucks.  In that
situation, presumably there is one pulley on the common shaft.  I was commenting on
the fact that in that setup if the failure mode for the Isuzu vacuum pump is to seize,
then presumably the alternator stops, too.  I have no knowledge of the failure modes
of the Isuzu combined unit, and would be interested to hear from someone about it.  I
imagine the following setup: 1 belt running around e-shaft, water pump, combined Isuzu
vacuum & alternator, 1 belt around e-shaft, water pump, separate alternator, and air
conditioner compressor (yea, yea, I'm dreaming).  Belts are separated by a perforated
shield, and neither belt is absolutely critical (assuming you can get by without
vacuum-powered instruments).

Russell Kent

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