Today's Message Index:
----------------------
1. 10:32 AM - Lifters and stuck valves (TeamGrumman@aol.com)
2. 10:57 AM - Re: Lifters and stuck valves (James Courtney)
3. 07:02 PM - Re: Lifters and stuck valves (Gil Alexander)
4. 07:17 PM - Re: Lifters and stuck valves (Geoffrey Hickey)
5. 07:17 PM - Re: Lifters and stuck valves (Geoffrey Hickey)
6. 08:17 PM - Re: Lifters and stuck valves (TeamGrumman@AOL.COM)
7. 08:35 PM - Re: Lifters and stuck valves (TeamGrumman@AOL.COM)
Message 1
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| Subject: | Lifters and stuck valves |
--> TeamGrumman-List message posted by: TeamGrumman@aol.com
I'm surprised no one wrote in to comment on what I found.
Message 2
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| Subject: | Lifters and stuck valves |
--> TeamGrumman-List message posted by: "James Courtney" <jamey@jamescourtney.net>
It was my plane so I already had the chat with you. I also helped you clean
the lifters for #3 which were binding so you've got no arguments from me:)
Jamey
AA5B N72T @ KSQL (okay, AUN for cylinders)
A36 N7218R @ KSQL
-----Original Message-----
From: owner-teamgrumman-list-server@matronics.com
[mailto:owner-teamgrumman-list-server@matronics.com] On Behalf Of
TeamGrumman@aol.com
Sent: Monday, February 20, 2006 10:30 AM
Subject: TeamGrumman-List: Lifters and stuck valves
--> TeamGrumman-List message posted by: TeamGrumman@aol.com
I'm surprised no one wrote in to comment on what I found.
Message 3
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| Subject: | Lifters and stuck valves |
--> TeamGrumman-List message posted by: Gil Alexander <gilalex@earthlink.net>
Gary... doesn't SB388C also call out a cleaning of the lifters at the
same time as the infamous "wobble check"??
If so, should be done every 400 hrs (old cylinders...) ....gil in Tucson
>-----Original Message-----
>From: owner-teamgrumman-list-server@matronics.com
>[mailto:owner-teamgrumman-list-server@matronics.com] On Behalf Of
>TeamGrumman@aol.com
>Sent: Monday, February 20, 2006 10:30 AM
>To: teamgrumman-list@matronics.com
>Subject: TeamGrumman-List: Lifters and stuck valves
>
>
>--> TeamGrumman-List message posted by: TeamGrumman@aol.com
>
>I'm surprised no one wrote in to comment on what I found.
>
Message 4
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| Subject: | Re: Lifters and stuck valves |
--> TeamGrumman-List message posted by: Geoffrey Hickey <ardri@comcast.net>
TeamGrumman@aol.com wrote:
> --> TeamGrumman-List message posted by: TeamGrumman@aol.com
>
> I'm surprised no one wrote in to comment on what I found.
>
>
OK, I'll comment,
If the tappets are varnished and carbon-coated, doesn't that also imply
a temperature problem? Or are they generally like this when
disassembled? (Maybe I should leave out the "or", given the temperature
problems so common to our Lycomings.)
When the old cylinders on the Cheetah failed the wobble check at 400
hours SOH, the #4 cylinder also had out-of-tolerance DTC on the exhaust
valve due to a tuliped and eroded valve head. More over-temperature
damage, I suspect.
- Geoff Hickey -
Cheetah N26681
Message 5
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| Subject: | Re: Lifters and stuck valves |
--> TeamGrumman-List message posted by: Geoffrey Hickey <ardri@comcast.net>
TeamGrumman@aol.com wrote:
> --> TeamGrumman-List message posted by: TeamGrumman@aol.com
>
> I'm surprised no one wrote in to comment on what I found.
>
>
OK, I'll comment,
If the tappets are varnished and carbon-coated, doesn't that also imply
a temperature problem? Or are they generally like this when
disassembled? (Maybe I should leave out the "or", given the temperature
problems so common to our Lycomings.)
When the old cylinders on the Cheetah failed the wobble check at 400
hours SOH, the #4 cylinder also had out-of-tolerance DTC on the exhaust
valve due to a tuliped and eroded valve head. More over-temperature
damage, I suspect.
- Geoff Hickey -
Cheetah N26681
Message 6
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| Subject: | Re: Lifters and stuck valves |
--> TeamGrumman-List message posted by: TeamGrumman@aol.com
It's possible that is was heat. But, not very likely. My guess is it
wasn't flown enough. It did sit for a number of years. However, it has been
flown regularly for the last 4 years.
I'm wondering, Geoff, how many hours since Top? If your valves had been
heated to the point of melting, (going into the plastic range), there is a very
good chance the valve clearance was zero (or less).
The valve piece I found in the muffler had been heated to the point that most
of the valve seat mating surface had heat stress cracks in them.
I'm still going to be checking my valve tappet clearance every 100 hours or
so. Just in case.
Gary
PS, I can do that with my own plane.
Message 7
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| Subject: | Re: Lifters and stuck valves |
--> TeamGrumman-List message posted by: TeamGrumman@aol.com
In a message dated 2/20/06 7:04:33 PM, gilalex@earthlink.net writes:
> Gary... doesn't=A0=A0 SB388C also call out a cleaning of the lifters at the
> same time as the infamous "wobble check"??
>
> If so, should be done every 400 hrs (old cylinders...)=A0 ....gil=20in
> Tucson
>
Well, yes, I guess it does. Hadn't thought of it.
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