Today's Message Index:
----------------------
1. 02:42 PM - Re: Jabiru 2200 (K BURNS)
2. 07:24 PM - Re: Jabiru 2200 (Richard Girard)
3. 08:33 PM - Re: Jabiru 2200 (Tonyplane)
Message 1
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Fritz,=0A=0AOther replies have not diagnosed the cause of your pushrod comi
ng off, the cause =0Aof this problem on an engine of mine was a sticky valv
e stem, the valve did not =0Aclose fully ,then the pushrod fell away from t
he retaining dome in the rocker =0Aarm.=0A=0ASugested cause of the sticktio
n was contaminants from the fuel on an intake =0Avalve,-( a mix including
unleaded had been used on the last flight prior to a =0Alay up and had dri
ed to form a gum).=0A=0AThe head was removed and valves taken out ,valve gu
ides then carefully reamed to =0Aremove deposits, after which the engine ra
n correctly.=0A=0AFinaly I decided on replacing the heads as I had a new se
t on order.=0A=0AI would advise checking "stiction" of your valves in their
guides and cleaning =0Aof valve stems minimum, you may be able to inspect
rubbing area of valve =0Astem-after removing exhaust pipe, to review leva
l of carbon build up removal =0Amethods etc.=0A=0ARegards=0A=0AKevin=0A=0A
=0A=0A=0A________________________________=0AFrom: fritzschaub <fritz_schaub
@bluewin.ch>=0ATo: jabiruengine-list@matronics.com=0ASent: Monday, 16 Augus
t, 2010 8:18:37=0ASubject: JabiruEngine-List: Jabiru 2200=0A=0ASorry for my
bad behaviour, my original massage was refused, probably because I =0Ainse
rted 2 pictures. Now without pictures:=0A=0AMy Jab was running for some min
utes to go from the parking area to the hold =0Apoint. There I switched it
off and some minutes later made it run again. =0A=0AIt was all different, s
trange noise, no power, as working with only 3 =0Acylinders.. The faulty el
ement was the exhaust valve pushrod cylinder 3 coming =0Aup beside the rock
er. So the exhaust valve remained closed.- =0A=0ATappet clearance was OK,
checked 5 hour before this event, after the event lock =0Anut and screw st
ill tight in place. Valve spring OK, not broken. Pushrod is =0Aslightly fle
xed, less then 0,02", probably due to the fact to be squeezed =0Abetween wa
ll and rocker arm. The motor, solid valve lifter type has 300hours. Do =0Ay
ou have any idea what I have to do, to replace to avoid this event in the
=0Afuture? Thank you for help =0A=0AFritz; Jab 2200 with Rans-Coyote=0A=0A
================ =0A
Message 2
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You might want to try a little Marvel Mystery Oil in your gas per their
recommendations. I use it as an alternate form of compliance to a SB on my
HKS for valve sticking, guide wear. Works great.
Rick Girard
On Fri, Aug 27, 2010 at 4:37 PM, K BURNS <kjburns@btinternet.com> wrote:
> Fritz,
>
> Other replies have not diagnosed the cause of your pushrod coming off, the
> cause of this problem on an engine of mine was a sticky valve stem, the
> valve did not close fully ,then the pushrod fell away from the retaining
> dome in the rocker arm.
>
> Sugested cause of the sticktion was contaminants from the fuel on an intake
> valve, ( a mix including unleaded had been used on the last flight prior to
> a lay up and had dried to form a gum).
>
> The head was removed and valves taken out ,valve guides then carefully
> reamed to remove deposits, after which the engine ran correctly.
>
> Finaly I decided on replacing the heads as I had a new set on order.
>
> I would advise checking "stiction" of your valves in their guides and
> cleaning of valve stems minimum, you may be able to inspect rubbing area of
> valve stem after removing exhaust pipe, to review leval of carbon build up
> removal methods etc.
>
> Regards
>
> Kevin
>
> ------------------------------
> *From:* fritzschaub <fritz_schaub@bluewin.ch>
> *To:* jabiruengine-list@matronics.com
> *Sent:* Monday, 16 August, 2010 8:18:37
> *Subject:* JabiruEngine-List: Jabiru 2200
>
> Sorry for my bad behaviour, my original massage was refused, probably
> because I inserted 2 pictures. Now without pictures:
>
> My Jab was running for some minutes to go from the parking area to the hold
> point. There I switched it off and some minutes later made it run again.
> It was all different, strange noise, no power, as working with only 3
> cylinders.. The faulty element was the exhaust valve pushrod cylinder 3
> coming up beside the rocker. So the exhaust valve remained closed.
> Tappet clearance was OK, checked 5 hour before this event, after the event
> lock nut and screw still tight in place. Valve spring OK, not broken.
> Pushrod is slightly flexed, less then 0,02", probably due to the fact to be
> squeezed between wall and rocker arm. The motor, solid valve lifter type has
> 300hours. Do you have any idea what I have to do, to replace to avoid this
> event in the future? Thank you for help
>
> Fritz; Jab 2200 with Rans-Coyote
>
> *http://www.matronics.com/N://forums.matronics.com/" target=_blank rel=nofollow>http://forums.matr --> <http://www.matronics.com/contribution>*
>
> *
>
> *
>
>
--
Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable
to imagine how we might possibly have gone wrong.
- G.K. Chesterton
Message 3
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I do not wish to start any controversy over any fuel additives, but I have c
lose to 600 trouble free hrs on my Jab 3300, s/n
33A644. A few years ago I would occasionally hear a "ting" when I would pul
l the prop
through by hand during preflight for an Armstrong compression check I suspe
cted the "ting" might be caused by a valve momentarily sticking. I started
using 2 oz of Marvel Mystery Oil per 5 gal of fuel, mostly 93 octane (U.S.)
alcohol free and some 100LL. Since then I recall no "ting".
Tony Graziano
Sent from my iPhone
On Aug 27, 2010, at 9:23 PM, Richard Girard <aslsa.rng@gmail.com> wrote:
> You might want to try a little Marvel Mystery Oil in your gas per their re
commendations. I use it as an alternate form of compliance to a SB on my HKS
for valve sticking, guide wear. Works great.
>
> Rick Girard
>
> On Fri, Aug 27, 2010 at 4:37 PM, K BURNS <kjburns@btinternet.com> wrote:
> Fritz,
>
> Other replies have not diagnosed the cause of your pushrod coming off, the
cause of this problem on an engine of mine was a sticky valve stem, the val
ve did not close fully ,then the pushrod fell away from the retaining dome i
n the rocker arm.
>
> Sugested cause of the sticktion was contaminants from the fuel on an intak
e valve, ( a mix including unleaded had been used on the last flight prior t
o a lay up and had dried to form a gum).
>
> The head was removed and valves taken out ,valve guides then carefully rea
med to remove deposits, after which the engine ran correctly.
>
> Finaly I decided on replacing the heads as I had a new set on order.
>
> I would advise checking "stiction" of your valves in their guides and clea
ning of valve stems minimum, you may be able to inspect rubbing area of valv
e stem after removing exhaust pipe, to review leval of carbon build up remov
al methods etc.
>
> Regards
>
> Kevin
>
> From: fritzschaub <fritz_schaub@bluewin.ch>
> To: jabiruengine-list@matronics.com
> Sent: Monday, 16 August, 2010 8:18:37
> Subject: JabiruEngine-List: Jabiru 2200
>
> Sorry for my bad behaviour, my original massage was refused, probably beca
use I inserted 2 pictures. Now without pictures:
> My Jab was running for some minutes to go from the parking area to the hol
d point. There I switched it off and some minutes later made it run again.
> It was all different, strange noise, no power, as working with only 3 cyli
nders.. The faulty element was the exhaust valve pushrod cylinder 3 coming u
p beside the rocker. So the exhaust valve remained closed.
> Tappet clearance was OK, checked 5 hour before this event, after the event
lock nut and screw still tight in place. Valve spring OK, not broken. Pushr
od is slightly flexed, less then 0,02", probably due to the fact to be squee
zed between wall and rocker arm. The motor, solid valve lifter type has 300h
ours. Do you have any idea what I have to do, to replace to avoid this event
in the future? Thank you for help
>
> Fritz; Jab 2200 with Rans-Coyote
>
>
> http://www.matronics.com/N://forums.matronics.com/" target=_blank rel=
nofollow>http://forums.matr -->
>
>
> ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-Lis
t
> tp://forums.matronics.com
> _blank">http://www.matronics.com/contribution
>
>
>
>
> --
> Zulu Delta
> Kolb Mk IIIC
> 582 Gray head
> 4.00 C gearbox
> 3 blade WD
> Thanks, Homer GBYM
>
> It is not bigotry to be certain we are right; but it is bigotry to be unab
le to imagine how we might possibly have gone wrong.
> - G.K. Chesterton
>
>
>
>
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