REFLECTOR:Checking valve guides ...

[Ronnie Brown]

Jim,

See http://www.prime-mover.org/Aviation/Manuf_Page/sb388b-1.html for a copy
of this mandatory service bulletin issued by Lycoming.  You're supposed to
inspect the valve guides every 400 hours.

Lycoming says they don't have a problem with these valve guides - yet, they
issued a new and improved valve guide a couple of years ago for parallel
valve engines.  Nothing yet for angle valve engines.

There is a pretty good set of write ups at
http://www.prime-mover.org/Engines/Marvel/index.html

Ronnie Brown

----- Original Message -----
From: "Jim Sower" <canarder@frontiernet.net>
To: "Cozy Forum" <Cozy_Builders@mailman.qth.net>; "Velocity Forum"
<reflector@tvbf.org>
Sent: Monday, March 15, 2004 12:44 AM
Subject: REFLECTOR:Checking valve guides ...


| I've got a problem for some of you Lyc doctors ....
|
| I've been hearing off and on about checking valve guides on Lycs
| for too much or too little clearance - either ready to seize or
| burning oil.  I'm doing my annual now and thought I'd check the
| guides on my angle valve IO-360.  Went to the local IA and he
| said that if he checks them at all, it's pull the jug, remove
| the valve and mic it.  Seemed a little much since I thought what
| I'd been hearing involved pulling the spring, wiggling the stem
| and estimating the severity of the lash problem.
|
| Is the "quick and dirty" check, I've described common practice?
| If so, how exactly, does one perform the inspection?  If not,
| how common is pulling the jugs, field stripping them and mic-ing
| the guides?  Do I need to bother at all with 500 hrs on the
| engine and two jugs with 100 and 200 hrs on them?
|
| Need some straight answers .... Jim S.
|
|
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