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1. 05:13 AM - Re: Oversized valve guides (James, Clive R)
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| Subject: | RE: Oversized valve guides |
Alfred, your engine seems to be about the same vintage as mine. What is
the serial number?
On your blog you mention the valve guides were worn. I suggest that
wasn't the case, I suggest they were oversized when the engine was
built. Mine were, I discovered it after only 37 hrs flying (well Roger
did). I had the same issues as you with discoloration in the rocker
cavities.
If anyone is having excessive oil blowing in the bottle and they have a
brown residue in the pipe/bottle I suggest they check the valve guides.
Anyone with a 3300 of around the serial number 1460 should be aware of
this issue and look in the rocker boxes. Unless it's clean carry out a
measurement of the valve movement with a dial gauge as Alfred shows in
one of his pictures.
Jabiru won't have anything to do with my heads as I had them inspected
and the guides changed by an engineer that is no longer working for the
UK dealer (the dealer changed).
They won't even refund the price of the guides even though I have
offered to send them the old ones but I never expected them to....
I like your comments at the bottom of your blog. Sums up the Jabiru
engine situation....
Regards, Clive
http://jabiru-engine-inspect-400.blogspot.com/
[However, the attitude of JABIRU, trying to blame the problems of
design, improper use, (EGT, fuel, propeller, etc ...) contribute to
deterioration poor reputation of the engine, poor reputation
unfortunately justified by the continual technical design and
manufacturing changes over last months.
This engine is not fully bad, it is light, simple, pleasant usage. If
JABIRU had begun redesigning and lubricating valve guides, the builder
would have proved a real awareness of the interest of its customers.
In fact for over two years that the problems of valves are well known,
JABIRU, has never officially disclosed, especially on the causes and
remedies as for THRUE.
"Services Bulletins " on vent hole in the cylinder heads, on EGT
parameters , the use of fuels, etc. will never prevent a broken valve
if the engine is initially limit wear tolerances.
To my knowledge, JABIRU never =E9dit "Service Bulletin ", to advise than
large orange-brown traces in the rockers cavities, is the beginning of
wear in valves guides resulting in a possible valve failure. It is my
own opinion and the result of my last experience with this engine.
I hope to help raise awareness, preventive replacement of a valve guides
must be adapted when the appearance of orange-brown traces in the
rockers cavities (JABIRU syndrome, as some say) to avoid the risk of an
engine failure in flight .]
From: jabiruengines@yahoogroups.com
[mailto:jabiruengines@yahoogroups.com] On Behalf Of Janssen Alfred
Sent: 16 December 2011 17:24
Subject: Re : [jabiruengines] Re: Oil System (no OCA, no TOCA)
Hi.
I never fit the oil cooler on the standard port with the JABIRU OCA due
to restrictive flow.
Since 3 years now over 300 hours, (500 total), I fit the oil cooler on
oil circuitsto feed heads cylinders.
Main advantage is to bring coolest oil on hottest parts of the engine,
and prevent any restrictive flow to the oil pump.
(Sorry for my approximative english language).
See : Modification N=B02;
________________________________
De : roger lewis <rogerpl88@yahoo.co.uk <mailto:rogerpl88%40yahoo.co.uk>
>
=C0 : "jabiruengines@yahoogroups.com
<mailto:jabiruengines%40yahoogroups.com> "
<jabiruengines@yahoogroups.com <mailto:jabiruengines%40yahoogroups.com>
>
Envoy=E9 le : Vendredi 16 D=E9cembre 2011 13h19
Objet : Re: [jabiruengines] Re: Oil System
Chuck,
Human nature is such that we tend to 'see' what we want to 'see' so I
missed the ambiguity of your statement 'flows through the 3/4 inch
center post back to the sump'.
The oil of course flows through the 3/4 center post into the main
gallery which feeds the hyd valves, the rocker chambers, the main
bearings, the big end bearings etc. Having done all the important work
of lubricating and removing heat it then goes back into the sump and the
cycle begins again.
________________________________
From: cffd66 <cffd66@yahoo.com <mailto:cffd66%40yahoo.com> >
<mailto:jabiruengines%40yahoogroups.com>
Sent: Friday, 16 December 2011, 4:45
Subject: [jabiruengines] Re: Oil System
Here is what I have gathered. The "just hole" is where the oil comes
from the pump, with an OCA the oil goes to the oil cooler from the
bottom of the OCA, returns from the oil cooler to the top of the OCA
where the oil enters the openings in the bottom of the oil filter, the
oil then flows from the outside of the filter element to the inside
where it then flows through the 3/4 inch center post back to the sump.
If the filter or oil lines get plugged, the oil flows from the "just
hole" to the pressure relief valve behind the circlip (the other hole),
all this happens on the bottom side of the OCA.
Chuck D.
--- In jabiruengines@yahoogroups.com
<mailto:jabiruengines%40yahoogroups.com> , Lynn Matteson <lynnmatt@...>
wrote:
>
> I think it's more than semantics, Roger....someone might perceive
> from your statement that you did not know *how* the oil flowed,
> meaning (to me) that you did not understand the path, and I think I
> know enough about you that I know that you do in fact understand the
> flow. If you were to say that you don't know *why* the oil flows as
> it does, this suggests to me that you might be questioning Jabiru's
> reasoning for doing the flow path like they did.
>
> Lynn Matteson
> Kitfox IV Speedster, taildragger
> Jabiru 2200, #2062
> Prince prop 64 x 30, P-tip
> Electroair direct-fire ignition system
> Rotec TBI-40 injection (sleeved to 36mm)
> Status: flying with 1204 hrs... (since 3-27-2006)
>
>
>
> On Dec 15, 2011, at 11:17 AM, roger lewis wrote:
>
> > mmmmm ....... semantics
> >
> >
> > ________________________________
> > From: Lynn Matteson <lynnmatt@...>
> > To: jabiruengines@yahoogroups.com
<mailto:jabiruengines%40yahoogroups.com>
> > Sent: Thursday, 15 December 2011, 16:12
> > Subject: Re: [jabiruengines] Oil System
> >
> >
> >
> > I'm sure you meant difficult to see WHY the oil flows as it does,
and
> > not HOW it flows as it does, eh, Roger?
> >
> > Lynn Matteson
> > Kitfox IV Speedster, taildragger
> > Jabiru 2200, #2062
> > Prince prop 64 x 30, P-tip
> > Electroair direct-fire ignition system
> > Rotec TBI-40 injection (sleeved to 36mm)
> > Status: flying with 1204 hrs... (since 3-27-2006)
> >
> > On Dec 15, 2011, at 11:02 AM, roger lewis wrote:
> >
> >> The 'just a hole' is an important hole as that is where all the oil
> >> from the oil pump comes from.
> >>
> >> The circlip and washer is the pressure relief valve that opens to
> >> allow oil to be dumped back into the sump.
> >>
> >> Now the difficult bit (for me) is to see how the oil flows from the
> >> oil pump hole, cooled in the cooler and filtered before going into
> >> the main gallery.
> >>
> >>
> >> ________________________________
> >> From: Charles Deiterich <cffd66@...>
> >> To: jablist <jabiruengines@yahoogroups.com
<mailto:jabiruengines%40yahoogroups.com> >
> >> Sent: Thursday, 15 December 2011, 15:47
> >> Subject: [jabiruengines] Oil System
> >>
> >>
> >>
> >> Recently, I removed my Jab 2200 oil cooler adapter. Under it are
> >> three openings in the case. The first in the center is a threaded
> >> post for the oil filter/OCA attachment, the second is just below
> >> with a circlip and washer, the third to the left and slightly above
> >> seems to be just a hole. What is the function of the last two
holes?
> >>
> >> Chuck D.
> >> N701TX
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >>
> >>
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >>
> >>
> >> ------------------------------------
> >>
> >> Yahoo! Groups Links
> >>
> >>
> >>
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
>
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