Today's Message Index:
----------------------
1. 08:48 AM - Re: New rocker arm bushings in (Jabiru USA)
2. 09:15 AM - Re: New rocker arm bushings in (Lynn Matteson)
3. 03:06 PM - Re: New rocker arm bushings in - Lynn (Jose M. Toro)
4. 04:57 PM - Re: New rocker arm bushings in - Lynn (Lynn Matteson)
5. 05:21 PM - Re: New rocker arm bushings in - Lynn (Jose M. Toro)
6. 05:37 PM - Re: New rocker arm bushings in - Lynn (Lynn Matteson)
Message 1
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| Subject: | New rocker arm bushings in |
Lynn,
Please do keep us informed on how the new bushings work. I think your
approach is right on.
Pete Krotje
Jabiru USA Sport Aircraft, LLC
-----Original Message-----
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of Lynn
Matteson
Sent: Friday, May 11, 2007 6:25 PM
Subject: Re: JabiruEngine-List: New rocker arm bushings in
Well, the old bushings were a teflon-coated bronze over a steel shell
(TPFE, I believe they are known as) and for whatever reason, they
failed at...or at least I discovered them failed at...273 hours. I
decided not to replace them with the original style bushings, because
I don't know the history of how these bushings hold up under the
splash-lubricated, high-pressure (the valve spring), environment they
operate in. Now to be perfectly honest, maybe nobody else has had a
problem with these bushings, but I did, so I elected to try my own
"shade-tree engineering" and put in oilite bronze bushings. In doing
so, I decided to supplement the oil that ordinarily makes its way
into the side of the standard bushings. The standard bushings are
allowed (according to my owners manual) .004"-.010" side clearance. I
did not change this, but I did drill a .093" hole vertically into the
rocker arm, at exactly the 12 o'clock position of the rocker arm.
This will allow the oil a chance to run into the hole and help lube
the bushing.
If anybody cares, I'll continue to report how I installed the
bushings. They came 16mm wide and the rocker arm is 15mm, so I
shortened them on my lathe. I had pressed the old bushings out, and
after drilling the rocker arms for the oiling holes, I drilled the
bushing oil holes a little larger, then pressed them into place,
keeping the alignment of the holes in mind. They all came out aligned
as hoped, and then I had to ream the bushings to the size suggested
in the owners manual... .474"-.475". This provides for 2-3
thousandths oil clearance for the .472" shaft. I then swapped the
rocker shafts side-for-side, to enable the new bushings to ride on
the un-used part of the shaft. I also chamfered the sides of the new
bushings to further allow oil to make its way into the oil space
provided between the shaft and arm.
I've got to further say that I don't know squat about teflon in
engine bearings...my only use of teflon (that I know of) is frying
eggs in a pan....low (relative) heat, no pressure, and the eggs taste
fine. I wouldn't have eaten eggs cooked on the teflon that was
visible inside the removed bushings...they looked like the frypan had
been attacked with a steel spatula, if you'll permit me the kitchen
analogy. : )
Again, I'm not saying that Jabiru made a mistake, maybe I just got a
lemon, and if my "fix" doesn't work out, I will have no apologies to
make. My engine is in a Kitfox Model IV *experimental* airplane, and
that's JUST what I'm doing...experimenting.
Lynn Matteson
Grass Lake, Michigan
Kitfox IV Speedster w/Jabiru 2200
flying w/275+ hrs
do not archive
On May 11, 2007, at 6:06 PM, Kayberg@aol.com wrote:
> In a message dated 5/11/2007 5:41:05 PM Eastern Daylight Time,
> lynnmatt@jps.net writes:
>
> So far so good on the new rocker arm bushings in my 2200. I installed
> them yesterday, but was finishing up building an oil cooler tunnel,
> so I wasn't able to fly it until today. I'd like to report gobs of
> new horsepower, but this isn't the case...just back to the normal,
> smooth operation. Gonna check the wear and the valve clearance in
> 15-20 hours, to see if I can find any changes, before I take it
> across the country at the end of the month.
>
>
> Was there much of a difference between the old bushings and the new
> ones?
>
>
> Doug Koenigsberg
>
>
> See what's free at AOL.com.
> http://www.matronics.com/Navigator?JabiruEngine-List _-
> ===========================================================
Message 2
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| Subject: | Re: New rocker arm bushings in |
Will do, Pete, and coming from you, that's good encouragement...thanks.
Lynn Matteson
Grass Lake, Michigan
Kitfox IV Speedster w/Jabiru 2200
flying w/275+ hrs
On May 12, 2007, at 11:47 AM, Jabiru USA wrote:
> <info@usjabiru.com>
>
> Lynn,
>
> Please do keep us informed on how the new bushings work. I think your
> approach is right on.
>
> Pete Krotje
> Jabiru USA Sport Aircraft, LLC
>
> -----Original Message-----
> From: owner-jabiruengine-list-server@matronics.com
> [mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of
> Lynn
> Matteson
> Sent: Friday, May 11, 2007 6:25 PM
> To: jabiruengine-list@matronics.com
> Subject: Re: JabiruEngine-List: New rocker arm bushings in
>
> <lynnmatt@jps.net>
>
> Well, the old bushings were a teflon-coated bronze over a steel shell
> (TPFE, I believe they are known as) and for whatever reason, they
> failed at...or at least I discovered them failed at...273 hours. I
> decided not to replace them with the original style bushings, because
> I don't know the history of how these bushings hold up under the
> splash-lubricated, high-pressure (the valve spring), environment they
> operate in. Now to be perfectly honest, maybe nobody else has had a
> problem with these bushings, but I did, so I elected to try my own
> "shade-tree engineering" and put in oilite bronze bushings. In doing
> so, I decided to supplement the oil that ordinarily makes its way
> into the side of the standard bushings. The standard bushings are
> allowed (according to my owners manual) .004"-.010" side clearance. I
> did not change this, but I did drill a .093" hole vertically into the
> rocker arm, at exactly the 12 o'clock position of the rocker arm.
> This will allow the oil a chance to run into the hole and help lube
> the bushing.
>
> If anybody cares, I'll continue to report how I installed the
> bushings. They came 16mm wide and the rocker arm is 15mm, so I
> shortened them on my lathe. I had pressed the old bushings out, and
> after drilling the rocker arms for the oiling holes, I drilled the
> bushing oil holes a little larger, then pressed them into place,
> keeping the alignment of the holes in mind. They all came out aligned
> as hoped, and then I had to ream the bushings to the size suggested
> in the owners manual... .474"-.475". This provides for 2-3
> thousandths oil clearance for the .472" shaft. I then swapped the
> rocker shafts side-for-side, to enable the new bushings to ride on
> the un-used part of the shaft. I also chamfered the sides of the new
> bushings to further allow oil to make its way into the oil space
> provided between the shaft and arm.
>
> I've got to further say that I don't know squat about teflon in
> engine bearings...my only use of teflon (that I know of) is frying
> eggs in a pan....low (relative) heat, no pressure, and the eggs taste
> fine. I wouldn't have eaten eggs cooked on the teflon that was
> visible inside the removed bushings...they looked like the frypan had
> been attacked with a steel spatula, if you'll permit me the kitchen
> analogy. : )
>
> Again, I'm not saying that Jabiru made a mistake, maybe I just got a
> lemon, and if my "fix" doesn't work out, I will have no apologies to
> make. My engine is in a Kitfox Model IV *experimental* airplane, and
> that's JUST what I'm doing...experimenting.
>
> Lynn Matteson
Message 3
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| Subject: | Re: New rocker arm bushings in - Lynn |
Lynn:
Oil cooler tunnel? What do you mean? Have pictures? By the way, I saw pictures
of your plane on the Kitfox site. Looks great!!!
Jose
----- Original Message ----
From: Lynn Matteson <lynnmatt@jps.net>
Sent: Friday, May 11, 2007 5:42:57 PM
Subject: JabiruEngine-List: New rocker arm bushings in
So far so good on the new rocker arm bushings in my 2200. I installed
them yesterday, but was finishing up building an oil cooler tunnel,
so I wasn't able to fly it until today. I'd like to report gobs of
new horsepower, but this isn't the case...just back to the normal,
smooth operation. Gonna check the wear and the valve clearance in
15-20 hours, to see if I can find any changes, before I take it
across the country at the end of the month.
Lynn Matteson
Grass Lake, Michigan
Kitfox IV Speedster w/Jabiru 2200
flying w/275+ hrs
Sucker-punch spam with award-winning protection.
Try the free Yahoo! Mail Beta.
Message 4
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| Subject: | Re: New rocker arm bushings in - Lynn |
Thanks, Jose.
The tunnel (for want of a better name) is just a 3-sided box that
channels the incoming air through the oil cooler and under the oil
pan (sump). I'll try to post it here on the site, but if I can't make
it fly, I'll send it your way, Jose.
Lynn Matteson
Grass Lake, Michigan
Kitfox IV Speedster w/Jabiru 2200
flying w/275+ hrs
On May 12, 2007, at 6:06 PM, Jose M. Toro wrote:
> <jose_m_toro@yahoo.com>
>
> Lynn:
>
> Oil cooler tunnel? What do you mean? Have pictures? By the way,
> I saw pictures of your plane on the Kitfox site. Looks great!!!
>
> Jose
>
> ----- Original Message ----
> From: Lynn Matteson <lynnmatt@jps.net>
> To: jabiruengine-list@matronics.com
> Sent: Friday, May 11, 2007 5:42:57 PM
> Subject: JabiruEngine-List: New rocker arm bushings in
>
>
> <lynnmatt@jps.net>
>
> So far so good on the new rocker arm bushings in my 2200. I installed
> them yesterday, but was finishing up building an oil cooler tunnel,
> so I wasn't able to fly it until today. I'd like to report gobs of
> new horsepower, but this isn't the case...just back to the normal,
> smooth operation. Gonna check the wear and the valve clearance in
> 15-20 hours, to see if I can find any changes, before I take it
> across the country at the end of the month.
>
Message 5
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| Subject: | Re: New rocker arm bushings in - Lynn |
Thanks!
----- Original Message ----
From: Lynn Matteson <lynnmatt@jps.net>
Sent: Saturday, May 12, 2007 8:00:07 PM
Subject: Re: JabiruEngine-List: New rocker arm bushings in - Lynn
Thanks, Jose.
The tunnel (for want of a better name) is just a 3-sided box that
channels the incoming air through the oil cooler and under the oil
pan (sump). I'll try to post it here on the site, but if I can't make
it fly, I'll send it your way, Jose.
Lynn Matteson
Grass Lake, Michigan
Kitfox IV Speedster w/Jabiru 2200
flying w/275+ hrs
On May 12, 2007, at 6:06 PM, Jose M. Toro wrote:
> <jose_m_toro@yahoo.com>
>
> Lynn:
>
> Oil cooler tunnel? What do you mean? Have pictures? By the way,
> I saw pictures of your plane on the Kitfox site. Looks great!!!
>
> Jose
>
> ----- Original Message ----
> From: Lynn Matteson <lynnmatt@jps.net>
> To: jabiruengine-list@matronics.com
> Sent: Friday, May 11, 2007 5:42:57 PM
> Subject: JabiruEngine-List: New rocker arm bushings in
>
>
> <lynnmatt@jps.net>
>
> So far so good on the new rocker arm bushings in my 2200. I installed
> them yesterday, but was finishing up building an oil cooler tunnel,
> so I wasn't able to fly it until today. I'd like to report gobs of
> new horsepower, but this isn't the case...just back to the normal,
> smooth operation. Gonna check the wear and the valve clearance in
> 15-20 hours, to see if I can find any changes, before I take it
> across the country at the end of the month.
>
Don't get soaked. Take a quick peak at the forecast
with the Yahoo! Search weather shortcut.
http://tools.search.yahoo.com/shortcuts/#loc_weather
Message 6
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| Subject: | Re: New rocker arm bushings in - Lynn |
Here's an attempt at posting a picture of my oil cooler tunnel/baffle/
whatever you want to call it. The black rubber seal contacts the
sliding air valve that I built last winter. I left the tunnel a
little long at the back in case I wanted to shroud it from the
muffler, etc. The sliding valve allows for faster warm-ups, but may
be too restrictive for hot weather operation. If it is, I'll remove
it before heading west. Then the cowl opening will just dump the air
into the tunnel. The cable operates the sliding valve, which is out
of sight in the lower cowl.
Lynn Matteson
Grass Lake, Michigan
Kitfox IV Speedster w/Jabiru 2200
flying w/275+ hrs
=EF=BC
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