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Valve rocker shaft / bearing wear

 
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andy(at)suncoastjabiru.co
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PostPosted: Wed May 09, 2007 9:29 am    Post subject: Valve rocker shaft / bearing wear Reply with quote

Lynn,

You seem to have done all that is necessary in investigating and remedying
the problem.

I note your email about distributor shaft scoring where the oil seals ride,
but there were no pictures. I don't have a 'quick fix' for that issue
either; it's certainly not a usual occurrence - either oil leaking past the
seal or scoring of the shaft by the seal, and certainly not at the hours you
have. Those seals are usually pretty good but my guess is the one that was
leaking must have been damaged - maybe from new, and the one that scored the
other shaft had picked-up an abrasive particle in the seal. Unlikely? Yes,
but possible. I've seen many bearing / shaft instances where the (relatively
soft) bearing is in good condition, yet the (much harder) shaft has been
worn down. This is due to abrasive particles bedding into the soft bearing
(or in your case seal) material, and cutting away at the harder shaft.
Again, it seems you were unlucky in having these issues but no doubt you
have rectified them.

Andy

Suncoast Sportplanes, Inc.
39248 South Ave, Zephyrhills, FL 33542
Tel: (813) 779 2324 Fax: (813) 779 2246
www.suncoastjabiru.com

--


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Lynn Matteson



Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

PostPosted: Wed May 09, 2007 1:06 pm    Post subject: Valve rocker shaft / bearing wear Reply with quote

Andy-
Yes, that problem has been cured. New seals, new caps and rotors, and
a little product call "Speedi Sleeve". I also drilled a hole in the
lower area of each cap so I could feel there and see if the fix was
still working.
In the email to you, Pete, and Jim, I ended with "I have pictures
available" (or something like that), and Jim responded that he would
like to see them. I sent to him, and CC'd you and Pete. They were
sent via Kodak EasyShare. If you'd like to see them, holler. I sent
them about 3/24/2007 or thereabouts.

Lynn Matteson
Grass Lake, Michigan
Kitfox IV Speedster w/Jabiru 2200
flying w/275+ hrs
On May 9, 2007, at 1:27 PM, Andy Silvester wrote:

Quote:

<andy(at)suncoastjabiru.com>

Lynn,

You seem to have done all that is necessary in investigating and
remedying
the problem.

I note your email about distributor shaft scoring where the oil
seals ride,
but there were no pictures. I don't have a 'quick fix' for that issue
either; it's certainly not a usual occurrence - either oil leaking
past the
seal or scoring of the shaft by the seal, and certainly not at the
hours you
have. Those seals are usually pretty good but my guess is the one
that was
leaking must have been damaged - maybe from new, and the one that
scored the
other shaft had picked-up an abrasive particle in the seal.
Unlikely? Yes,
but possible. I've seen many bearing / shaft instances where the
(relatively
soft) bearing is in good condition, yet the (much harder) shaft has
been
worn down. This is due to abrasive particles bedding into the soft
bearing
(or in your case seal) material, and cutting away at the harder shaft.
Again, it seems you were unlucky in having these issues but no
doubt you
have rectified them.

Andy

Suncoast Sportplanes, Inc.
39248 South Ave, Zephyrhills, FL 33542
Tel: (813) 779 2324 Fax: (813) 779 2246
www.suncoastjabiru.com



- 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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