Gaskets

[george kennie]

Thanks Bill, Dave, Ken, Everybody who responded. Much additional information
indicating a few more areas that I missed. Will implement all suggestions.
Georgie

"William C. Harden" wrote:

> Georgie,
>
> If the engine won't come down to idle and the carburetor is closed, then
> you have an air leak.
>
> The air leak could be caused by any of the gaskets including the air box
> and valve cover, as well as any of the O' rings. The valve cover gasket
> is notorious for this problem.  Also consider the O' rings on the pipe
> at the air box and the engine head; also the O' rings at each end of the
> pushrod external tubes (at the head and engine case).
>
> Good luck.
>
> Bill Harden
>
> -----Original Message-----
> From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
> On Behalf Of george kennie
> Sent: Thursday, September 18, 2003 7:50 PM
> To: discussion at nsrca.org
> Subject: Re: Gaskets
>
> 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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