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12-02-2011, 04:22 PM
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Join Date: Feb 2011
Location: Sydney
Posts: 44
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Intake valve stem
Hi all,
Do Lycoming engines have intake valve stem seals?
If oil is getting into the intake manifold at idle would that indicate oil getting around the intake valve (getting sucked into the intake at low power).
Worn intake valve stem seal?
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Sydney, Australia
Fly for fun and for food
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12-02-2011, 04:25 PM
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Join Date: Mar 2005
Location: SE Florida
Posts: 1,499
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No, Lycoming engines do not have valve seals on either the intake or exhaust valves.
Charlie
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12-02-2011, 04:37 PM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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Oh but they can be installed... 
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Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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12-02-2011, 04:56 PM
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Join Date: Mar 2005
Location: SE Florida
Posts: 1,499
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Quote:
Originally Posted by LifeofReiley
Oh but they can be installed... |
Reilly,
Is there an automotive valve seal which will fit the Lycoming valve stems? I ask, because I know of another list member who was considering doing just that.
Charlie |
12-02-2011, 05:36 PM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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Quote:
Originally Posted by chaskuss
Reilly,
Is there an automotive valve seal which will fit the Lycoming valve stems? I ask, because I know of another list member who was considering doing just that.
Charlie
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There is... let me see if I can find the info in my files. Might take a day or two if I can locate.
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Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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12-02-2011, 05:38 PM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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I Cryo'ed everything and we're using Roller Rockers so we have not had any wear issues. 
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Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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12-02-2011, 06:14 PM
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Join Date: Feb 2011
Location: Sydney
Posts: 44
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Interesting, my mechanic told me to order a set of valve stem oil seals for my next annual because the intake valves have a little oil leaking past them at low power. Perhaps I got my wires crossed somewhere.
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Sydney, Australia
Fly for fun and for food
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12-02-2011, 06:21 PM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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Quote:
Originally Posted by Ant CB
Interesting, my mechanic told me to order a set of valve stem oil seals for my next annual because the intake valves have a little oil leaking past them at low power. Perhaps I got my wires crossed somewhere.
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Stock... Valve Guides Only, you could sure order them but it might be a little more detailed than just that.
We also ream precision fit these.
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Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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12-02-2011, 06:43 PM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,562
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There is a Mack diesel positive seal that will work on the exhaust (.500). Intake valves are a different story, I have not yet been able to locate a positive seal for a .400 valve. Umbrella seals will work on both.
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Please don't PM me! Email only!
Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
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N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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12-03-2011, 02:27 AM
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Join Date: Feb 2011
Location: Sydney
Posts: 44
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So ultimately how does one correct a leaky intake valve stem?
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Sydney, Australia
Fly for fun and for food
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