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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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 Posted: Fri May 11, 2007 1:40 pm Post subject: New rocker arm bushings in |
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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
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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Kayberg(at)aol.com
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| Posted: Fri May 11, 2007 2:06 pm Post subject: New rocker arm bushings in |
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In a message dated 5/11/2007 5:41:05 PM Eastern Daylight Time, lynnmatt(at)jps.net writes:
| Quote: |
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.
[quote][b]
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
|
| Posted: Fri May 11, 2007 3:22 pm Post subject: New rocker arm bushings in |
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|
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(at)aol.com wrote:
| Quote: | In a message dated 5/11/2007 5:41:05 PM Eastern Daylight Time,
lynnmatt(at)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 _-
============================================================
|
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http://www.matronics.com/Navigator?JabiruEngine-List |
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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donmorrisey
Joined: 17 Mar 2007
Posts: 18
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| Posted: Fri May 11, 2007 5:32 pm Post subject: New rocker arm bushings in |
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Lynn, excellent series of reports. Concise and well thought out. I'm not a gearhead and I could follow.
Thanks, Don
www.donsbushcaddy.com
Don Morrisey's Skunkworks
> From: lynnmatt(at)jps.net
| Quote: | Subject: Re: New rocker arm bushings in
Date: Fri, 11 May 2007 19:25:17 -0400
To: jabiruengine-list(at)matronics.com
--> JabiruEngine-List message posted by: Lynn Matteson <lynnmatt(at)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
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(at)aol.com wrote:
> In a message dated 5/11/2007 5:41:05 PM Eastern Daylight Time,
> lynnmatt(at)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 _-
> ===================================> ======
|
Add some color. Personalize your inbox with your favorite colors. Try it! [quote][b]
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_________________
Don...
BushCaddy R120
http://www.donsbushcaddy.com |
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info(at)usjabiru.com
Guest
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| Posted: Sat May 12, 2007 7:48 am Post subject: New rocker arm bushings in |
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|
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
--
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http://www.matronics.com/Navigator?JabiruEngine-List |
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
|
| Posted: Sat May 12, 2007 8:15 am Post subject: New rocker arm bushings in |
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|
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:
[quote]
<info(at)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
--
| | - The Matronics JabiruEngine-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?JabiruEngine-List |
|
_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
|
| Posted: Mon May 14, 2007 5:38 pm Post subject: New rocker arm bushings in |
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|
Lynn regarding the Teflon coating:
Years ago GM tried Teflon coated camshafts in the 304 V8 engines. They were plagued with camshaft problems until the Teflon coating was ditched. One thing about Teflon, as strong as it is chemically its also physically weak and brittle.
[img]cid:775083601(at)15052007-1373[/img]
Noel Loveys, RPP, AME intern
Campbellton, Newfoundland,
Canada
Kitfox Mod III-A, 582, B box, Ivo IFA
Aerocet 1100s
noelloveys(at)yahoo.ca (noelloveys(at)yahoo.ca)
| Quote: | Behalf Of Lynn
Matteson
Sent: Friday, May 11, 2007 6:25 PM
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
|
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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
|
| Posted: Mon May 14, 2007 6:11 pm Post subject: New rocker arm bushings in |
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|
Thanks for recalling that info, Noel. A V8 camshaft (if it's a 90° V
or thereabouts) is another case where the load is all centered in one
small area...the bottom of the bearing takes all the pressure from
the valve springs, as the rocker arm tries to lift the valve. At
least this is my memory of all the V8's that I've worked on. Now an
opposed engine would have equal load on both "sides" of the cam, so
wouldn't have this problem. I haven't really been around any of the
later engineering on engines so I don't know what the guys and gals
have come up with lately.
I now have about 6 hours on the new bushings, so in a few more days,
I'll have a look and see how things are holding up. It won't be a
very long-hour test, but unless it's a complete failure, I should
rest a bit easier for the "big trip."
One question, though...was it the lobes that were Teflon-coated, or
just the bearing surfaces, or both?
Lynn Matteson
Grass Lake, Michigan
Kitfox IV Speedster w/Jabiru 2200
flying w/275+ hrs
On May 14, 2007, at 9:37 PM, Noel Loveys wrote:
| Quote: | Lynn regarding the Teflon coating:
Years ago GM tried Teflon coated camshafts in the 304 V8 engines.
They were plagued with camshaft problems until the Teflon coating
was ditched. One thing about Teflon, as strong as it is chemically
its also physically weak and brittle.
Noel Loveys, RPP, AME intern
Campbellton, Newfoundland,
Canada
Kitfox Mod III-A, 582, B box, Ivo IFA
Aerocet 1100s
noelloveys(at)yahoo.ca
> Behalf Of Lynn
> Matteson
> Sent: Friday, May 11, 2007 6:25 PM
> 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
|
| | - The Matronics JabiruEngine-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?JabiruEngine-List |
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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