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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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 Posted: Sun Jan 29, 2006 7:29 pm Post subject: Check Your Exhaust Springs |
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Hi All,
Did my preflight today and found after 600 hrs. on the plane that the exhaust springs had practically eaten all the way through the metal hooks on the exhaust manifold. Some of the springs were eaten almost all the way through also. The safety wire was in place, but I guess the vibration had caused these two metal parts to abrade. On two of the springs and hooks they were ready to fail at any time. Please look yours over. Don't just look at the safety wire as I have, but also the metal contact point between the springs and hooks. I took mine apart and welded some extra case hardend rod in place. I had a happy ending. Please double check yours.
Have a nice day and a good flight.
P.S.
Oh, by the way it's supposed to be 73 to 75 degress out here in Tucson, Az. this week. I'll be thinking of you snow bound people. 
Take Care,
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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rlaird
Joined: 10 Jan 2006
Posts: 373
Location: Houston
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| Posted: Sun Jan 29, 2006 8:06 pm Post subject: Check Your Exhaust Springs |
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| Quote: | Oh, by the way it's supposed to be 73 to 75 degress out here in Tucson, Az. this week. I'll be thinking of you snow bound people.
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It was 81 degrees here in Houston, today, and I did 2 hours in my Kolb
in a t-shirt. 
Global warming is great, except in the summer, which lasts about 9
months here. 
-- Robert
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_________________
~~~~~~~~~~~~~~~~~~~
Robert Laird
formerly: MkIIIc w/ 912ULS & Gyrobee
current: Autogyro Cavalon w/ 914ULS
Houston, TX area
http://www.Texas-Flyer.com |
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Richard Pike
Joined: 09 Jan 2006
Posts: 1669
Location: Blountville, Tennessee
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| Posted: Sun Jan 29, 2006 8:22 pm Post subject: Check Your Exhaust Springs |
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You are right about those two points wearing through. I took a different
direction, I laid a big fillet of braze on the inside of the exhaust
manifold loops, the idea was that the brass would be easier on the
springs, keep them from breaking, and every year I would just add more
braze. It worked pretty well.
Finally discarded the spring system entirely, and use spring loaded
5/16" bolts through welded on brackets to hold everything together.
Perhaps a bit overdone and clunky, but they are so easy to inspect, and
when the bolts do get a bit of wear, they are so easy to replace. Using
common hardware store mild steel bolts (on purpose) drilled for a cotter
pin, seriously overbuilt, here are pictures -
http://www.bcchapel.org/pages/0003/pg2.htm
When I put those pictures on the web page, it was a new setup, after 150
hours, the bolts had minimal wear, there was still 1/4" of bolt
thickness left. Considering that the bolts are in tension, holding about
20 or 25 pounds of pressure from the springs, I am very satisfied.
Fabricating them takes a welder, about $15 worth of parts, (the metal
brackets that the bolts go through are from steel muffler clamp
brackets, I saw the ends off the clamps and use the u-channel ends off
the end of the clamp, the part that the hole goes through) and a couple
hours, but it gives a lot of peace of mind.
Richard Pike
MKIII N420P (420ldPoops)
Roger Lee wrote:
| Quote: |
Hi All,
Did my preflight today and found after 600 hrs. on the plane that the exhaust springs had practically eaten all the way through the metal hooks on the exhaust manifold. Some of the springs were eaten almost all the way through also. The safety wire was in place, but I guess the vibration had caused these two metal parts to abrade. On two of the springs and hooks they were ready to fail at any time. Please look yours over. Don't just look at the safety wire as I have, but also the metal contact point between the springs and hooks. I took mine apart and welded some extra case hardend rod in place. I had a happy ending. Please double check yours.
Have a nice day and a good flight.
P.S.
Oh, by the way it's supposed to be 73 to 75 degress out here in Tucson, Az. this week. I'll be thinking of you snow bound people.
Take Care,
--------
Roger Lee
Tucson, Az.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=7970#7970
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_________________
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing. |
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slyck(at)frontiernet.net
Guest
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| Posted: Mon Jan 30, 2006 5:45 am Post subject: Check Your Exhaust Springs |
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Don't believe that snow cover graphic on weather.com.....
46 degrees here at 8:30 AM, calm and not a speck of snow.
In the past month we've had maybe 4"
There may be something to that global warming.
-BB, western NY
do not archive
On 29, Jan 2006, at 11:05 PM, Robert Laird wrote:
| Quote: |
> Oh, by the way it's supposed to be 73 to 75 degress out here in
> Tucson, Az. this week. I'll be thinking of you snow bound people.
It was 81 degrees here in Houston, today, and I did 2 hours in my Kolb
in a t-shirt.
Global warming is great, except in the summer, which lasts about 9
months here.
-- Robert
|
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