Gaskets

[george kennie]

Guys,
Thanks for trying.
The engine is a 91 AC and has been sitting idle for about 2 years. 2 years ago
it was running O.K., but when I tried to run it in a  new airplane it did not
run very well. It starts O.K. and the top end seems good, but when I try to come
back to idle it only comes down to about 6k rpm and this is with the barrel
CLOSED and after running for about at least 30 seconds it may slow to 2200 with
sporadic intervals where it almosts quits and then sometimes will speed back up
to 6k again and once again, all with the barrel closed.
The regulator gasket is the diaphragm and I replaced that. I blew out all
passages in the regulator body and they are free and clear. I checked the
silicone plunger and it checks O.K.  The plunger shaft was checked for freedom
of movement, again O.K. The shut-off action of the plunger was checked and
operated as designed. The regulator screw is adjusted flush. The air-bleed screw
is adjusted 1&1/2 turns out(I've tried it from closed to 5 turns out).
The needle valve body has been blown clear and a small wire run thru the
passages to insure that no foreign material is clogging anything.New O-rings
installed on the needle valve body.New O-ring at the base of the airbox. The
backplate, carburetor body, and airbox gaskets replaced and all screws
adequately retightened. The valves adjusted and the cover base dressed flat and
reassembled with a new gasket. After all this the engine runs like it has an air
leak somewhere.
When I adjust the throttle from the 6k rpm point to return to full throttle it
sounds like it's starving for 2 or 3 seconds before it starts to recover to full
speed.
Tank pressure is strong and fuel flow to the carb is good.
I'm at my wits end and I'm not that keen on sending it to the repair facility as
I sent my 63 to them a couple of months ago and it came back the same way it
went in.Now I'm stuck with two engines that are unusable.
Any further ideas will be gratefully received.
Georgie


Tony Stillman wrote:

> George:
> The only real problem was the regulator gasket.  High nitro, over time, will
> cause the tiny fuel passage hole to close up.  The new regulator gasket
> material is black, and does not have this problem.  The "Leak Free" brand
> was also a different material, and will not clog.
>
> If you have to old brown "paper" regulator gasket, just replace it with the
> regulator gasket that is available seperately for about $1.50.
>
> Tony Stillman
> Radio South
> 3702 N. Pace Blvd.
> Pensacola, FL 32505
> 1-800-962-7802
> www.radiosouthrc.com
> ----- Original Message -----
> From: "george kennie" <geobet at gis.net>
> To: <discussion at nsrca.org>
> Sent: Thursday, September 18, 2003 12:39 PM
> Subject: Gaskets
>
> > Hey Guys,
> > Need a little help here!
> > Some of you YS gurus please respond.
> > I remember seeing Leak Free Gaskets advertised some time back. What I
> > would like to know is, why was there a market for this product? Does the
> > motor start to malfunction in some way that indicates to you that you
> > need new gaskets or that there may be a gasket leak somewhere and what
> > are the symptoms. Does the motor cease to run or does it become errattic
> > in some way? Please be specific as I feel that I may be experiencing
> > gasket woes.
> > Thanks for any help you can send my way.
> > Georgie
> >
> > =====================================
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> > #
> >
> >
> >
>
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