Today's Message Index:
----------------------
1. 06:29 PM - Fuel Tank Update (teamgrumman@aol.com)
2. 09:17 PM - Re: Speaking of oil.... (n32romeo@aol.com)
3. 10:25 PM - Re: Re: Speaking of oil.... (Mark Miller)
4. 11:36 PM - Re: Re: Speaking of oil.... (teamgrumman@aol.com)
Message 1
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| Subject: | Fuel Tank Update |
I took some pictures of the fuel tank when it was finished. I didn't take an
y 'Before' pics. =C2-Apparently I can make a QuickTime movie with iPhoto.
=C2-So,=C2-I made a movie. =C2-I'm not sure where the music came from.
=C2-I didn't add it. =C2-If you want to see the pics, let me know.
OK, so, the next step was to put the wing on and finish the annual. =C2-Th
e first step was a compression test. =C2-Both cylinders #1 and #3 showed l
eaking out of the exhaust valve. =C2-Since the fuel tank cost the owner ab
out $5000 to fix, I was a little reluctant to call the owner and tell him he
had leaking exhaust valves on his 800 hr factory reman engine (reman in 199
5). =C2-
Ordered two new cylinders. =C2-Removed the leaky cylinders. =C2-My norma
l routine is to remove the lifter assemblies and clean them up so I can chec
k dry tappet clearances. =C2-Then, coat the cam and lifters with assembly
lube. =C2-Imagine my surprise when one of the lifter faces felt rough.
=C2-Flashlight in hand, I found a bad cam lobe and two bad lifters. =C2
-I mean, really bad. =C2-Funny, nothing in the oil filter every time I c
hecked.
I went back through my inspection checklist notes and found my comments on o
il changes. =C2-Prior to coming to me, the average was an oil change every
50 to 60 hours (there was a maximum of 93 hours at one oil change) using Ph
illips 20-50 . . . =C2-for 7 years. =C2-The longest period of time betwe
en oil changes was 13 months; at
annual. =C2-Now, if I'm not mistaken, the Phillips oil does not contain th
e anti-scuff additive recommended by Lycoming. =C2-
Tomorrow, I order another reman from Lycoming.
1. Oil additives wear out.
Technically, oil does not wear out. However, extended use causes an oil
=99s additives to wear out or become depleted. For example, an ashless di
spersant aviation oil is designed to suspend dirt and metal particles picked
up from an aircraft engine. Eventually the oil will become "over-suspended.
" The principal reason oil is changed at regular intervals is to rid the eng
ine of these suspended impurities. Old oil, with a high degree of contaminan
ts, can cause bearing corrosion and deposit buildup. It can also get to the
point where it will not suspend the additional particles created during engi
ne operation. This produces particle buildup or sludge. Overworked oil will
also result in the depletion of its other additives. The result is that it w
ill be unable to perform with the benefits the additives were designed to pr
ovide.
Message 2
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| Subject: | Re: Speaking of oil.... |
Recently a hangar neighbor sold her airplane and retired from aviation (she?is
in her 70's) and gave me a couple of cases of Shell 20-50 in CANS (remember 24
quart cases?).? My first impulse is that I have always been told there is no
life limit on aviation oil, but others have expressed concern with using oil that
is 20+ years old.? The cans are in good shape.? What is the opinion here?
Rich Harrison
AA-1B N1632Romeo
C-182 N52992
?
Message 3
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| Subject: | Re: Speaking of oil.... |
Here is an opinion from Aeroshell I found on a web sit called forpilots.com.
Even this response is over 7 years old but is probably still good.
Mark Miller
Subject: Oil shelf life
From: Tim Helton
A while back there was a discussion about the shelf life of aviation oil....
I asked the folks at Aeroshell and today they responded:
------
Tim,
I asked our specialist in aviation about this question. He replied that
while the life of the oil on the shelf may be longer than two years
depending on the storage conditions, we prefer to stick with a two-year
shelf life for everyone's safety benefit. You might consider dumping the oil
in question, especially after seven years. For sure, it should not go into
an aircraft engine.
Thanks for your inquiry and interest in Shell products.
Ed
Ed Brown, for Shell lubricants
EBrown1@equilon.com
http://www.shell-lubricants.com
_____
From: owner-teamgrumman-list-server@matronics.com
[mailto:owner-teamgrumman-list-server@matronics.com] On Behalf Of
n32romeo@aol.com
Sent: Sunday, July 13, 2008 9:15 PM
Subject: TeamGrumman-List: Re: Speaking of oil....
Recently a hangar neighbor sold her airplane and retired from aviation (she
is in her 70's) and gave me a couple of cases of Shell 20-50 in CANS
(remember 24 quart cases?). My first impulse is that I have always been
told there is no life limit on aviation oil, but others have expressed
concern with using oil that is 20+ years old. The cans are in good shape.
What is the opinion here?
Rich Harrison
AA-1B N1632Romeo
C-182 N52992
_____
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Message 4
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| Subject: | Re: Speaking of oil.... |
do you mean Shell 15W-50? =C2-
It would be my guess that, in a sealed can, the additives probably won't bre
ak down.=C2-
See if you can find the email for Larry Tasch. =C2-So far, he's the only o
ne I know of that I'd trust with a question like that.
-----Original Message-----
From: n32romeo@aol.com
Sent: Sun, 13 Jul 2008 9:14 pm
Subject: TeamGrumman-List: Re: Speaking of oil....
Recently a hangar neighbor sold her airplane and retired from aviation (she
=C2-is in her 70's) and gave me a couple of cases of Shell 20-50 in CANS (
remember 24 quart cases?).=C2- My first impulse is that I have always been
told there is no life limit on aviation oil, but others have expressed conc
ern with using oil that is 20+ years old.=C2- The cans are in good shape.
=C2- What is the opinion here?
Rich Harrison
AA-1B N1632Romeo
C-182 N52992
=C2-
The Famous, the Infamous, the Lame - in your browser. Get the TMZ Toolbar No
w!
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