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Old 12-12-2010, 04:50 PM
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pawoSD pawoSD is offline
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Join Date: Oct 2004
Location: Grand Rapids, MI
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Quote:
Originally Posted by jt20 View Post
the tensioner is not designed to take the load when turning backwards, it will work, but it is not a very robust design.

The vacuum pump is something that does not want to be driven backwards. The pivoting arm is designed to 'give' in one direction only. It will go backwards without issue, it's just not ideal.
The vacuum pump on the 617 does not care which direction the engine turns, as it moves with a metal wheel that rides on a wavy surface of the drive face, forwards or backwards, the pump will work the same way.
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