At the Rotax classes I've attended at Rotech in Canada, Rob and Mike have be
en recommending the cork gaskets for years now.
Kevin
On May 22, 2012, at 5:11 PM, "Bud Yerly" <budyerly@msn.com> wrote:
> William and all Rotax / Jabiru owners:
>
> At Custom Flight we are having the same problem with the new carb kits. J
im Glover had his plane in for major repairs and upgrades. The engine sat a
while (six months) and we refurbished the carbs with new everything for Jim
since the carbs had 300 hours on them. We have done this numerous times wi
thout distress or difficult tuning. The engine at altitude began missing. A
t low boost below 27 inches or low manifold pressures under boost, the engin
e ran great, but when the boost came up to 34 inches, going through 6000 ft.
, the engine went out of tune. We couldn't fix it so we had Jim fly down to
Lockwood to have them have a go at it. They couldn't fix it either after n
ew carb bowls, complete teardown and rebuild again. In desperation, Lockwoo
d put two new carbs on the engine, tuned it up and it is back to normal at g
reat cost and time for the mechanics and owner.
>
> Now suddenly we are having a rash of 914 turbo leaks around the floats. N
419PL and 12AY have had leaks as have Bob, William and others. A turbochar
ged engine must have proper seals on the bowls and compensator for sure to o
perate properly. Take this as some hard learned advice::
>
> First, do not overtorque the float bowls to seal a leak on the 914, as the
bowls bend and distort and they are $140 each.
>
> Second, Bing has recommended cork gaskets for the float bowl for all the 9
12/912S engines with the bail clips. This is not sold as part of the tune-u
p kit (normally sold for about $50 with all the O-rings and paper gaskets fo
r two carbs). You have to ask for the cork gaskets specifically. A Bing Te
ch at the factory told us that we should be using the cork on all the bail c
lip Bing carbs. Jabiru included. On the 914 they still recommend the paper
gasket. We are not in agreement with Bing on the 914.
>
> We are surprised that it seems that the paper gaskets are just not holding
up in the 914, especially if it sits a while. So we are putting in cork ga
skets now as a matter of course on the 914s to see how that works. Of cours
e the cork gaskets cost twice as much, but between Kerry at Lockwood, Ed and
I we are looking at the cork to solve this issue long term for leaky bowls.
....
>
> Regards,
> Bud Yerly
> Europa Tech Support.
> ----- Original Message -----
> From: William Daniell
> To: europa-list@matronics.com
> Sent: Tuesday, May 22, 2012 8:41 AM
> Subject: Europa-List: for interest - float bowl gaskets
>
>
> For the record an interesting thing happened to me with my zenith which ha
s
> an aftermarket turbo fitted.
>
> Above 11k full power caused vibration - I thought this was just a normal
> "fault" of the aftermarket turbo. Take off from 8500 etc all normal.
> However the problem got worse and manifested itself at lower altitudes.
>
> We put on a vernier to manually adjust waste-gate and the problem showed u
p
> at higher MP - over 34". Otherwise the engine ran normally. It felt like
> fuel starvation.
>
> New carb vacuum chamber diaphragms, carb balance, full fuel system check,
> fuel pressure - no change. All readings completely normal except for the
> vibration and minor power loss at higher altitudes and power settings.
>
> Just out of interest we changed the carb float bowl gaskets which had been
> changed recently using rotax original parts. We put in after market softe
r
> cork gaskets because that's what we had. This cured the problem completel
y.
>
> The conclusion was that the float bowls had been dropped or the mating fac
es
> had been damaged in some very minor way allowing air to get into the syste
m
> but only at higher differential pressure - higher power settings and highe
r
> altitude. There was no evidence of fuel leak. The softer aftermarket
> gasket compensated for the minor flaws in the mating surfaces of the float
> bowls.
>
> We spent two days and maybe USD500 solving a problem which was turned out t
o
> be a 5c gasket.
>
> Will
> Bogota
>
> -----Original Message-----
> From: owner-europa-list-server@matronics.com
> [mailto:owner-europa-list-server@matronics.com] On Behalf Of europapa
> Sent: 21 May, 2012 15:51
> To: europa-list@matronics.com
> Subject: Europa-List: Re: Lack of power with water heated carb body
> mountings
>
>
> Hi,
>
> in the mailing list I can see all of your replies but not here in the foru
m
> [Question] .
> I am very happy to see so many help by real experts.
> Thank you so much.
> Karl, Craig, Bob, Pete,Terry, John and all the others, thank you so much.
> I am now thinking too that the added heat is not an issue.
> Today I had my prof-check or how do you call it?
> At full throttle and even with my not so light flight inspector the power
> produced by my 912s at high rpm / full throttle was good.
> But when reducing the rpm / throttle the engine became rough like an old
> diesel engine.
> I am rather confused.
> Now I have removed the carbs and will overhaul them.
> If that will not bee the answer I will totally remove the carb heaters to
> see if that will solve the problem.
> If there will still no cure ......... dose anybody wants to buy a very nic
e
> Europa Trigear...... ( no way! ;-) ).
> More information later, I am really tiered after this long and exciting da
y.
>
> CU
>
> Juergen
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=373508#373508
>
>
> http://www.matronnbsp; via the Web title=http://forums.matronics.com/
href="http://forums.matronics.com";>http://forums.matronics.com
> _p; generous bsp; title=http://www.matronics.
com/contribution href="http://www.matronics.com/contribution";>http://www.m
atronics.com/c================
>
>
>
>
>
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