Re: Re: Mystery Knock on 80q

["Smith, Kirby A" <kirby.a.smith@lmco.com>]

Bob <mx@snet.net> wrote:

	Phil Payne wrote:

	> In message <199809281605.JAA10855@warlock.qualcomm.com> Jeff
Waterstreet writes:
	>
	> > 1. Doesn't knock at idle.
	> > 2. Doesn't knock if you rev the engine while parked.
	> > 3. Only hear it under load; accelerating, usually between 1700
and 2500 rpm
	> > 4. Very pronounced/loud when engine cold.
	> > 5. When engine is very hot, can't hear it at all.
	>

	Auxillary vacuum pump shaft.

	Bob

Note that this can be ameliorated by removing the pump, opening the top, and
cleaning it.  Remove excess oil and reassemble.  Mine stays quiet for months
after a minor cleaning, and now more than a year since I did a more thorough
job.  I believe I put a more detailed description on the QFOM, located at:

http://pdikeman.ne.mediaone.net/cgi-bin/fom

                .... Kirby   (Kirby A. Smith)
                              2 x 1988 90q
                          New Hampshire USA