Today's Message Index:
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1. 11:24 AM - O-360A1A Longevity? (Jerry2DT@AOL.COM)
2. 12:23 PM - Re: O-360A1A Longevity? (tom.on.the.road@JUNO.COM)
3. 12:45 PM - Re: O-360A1A Longevity? (William Taft)
4. 03:29 PM - Re: O-360A1A Longevity? (Miguel Azevedo)
Message 1
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| Subject: | O-360A1A Longevity? |
Folks in the know...
Please weigh in on this. If one were to push the longevity of a 2000 SMOH
O-360 by doing a top overhaul, what would be a reasonable expectation of time
remaining? Given excellent care, would another 500-1000 hrs be unreasonable? I've
seen various anecdotes of 3000+ hrs, and I realize there would be a ton of
variables...
If one did this, what would the best warning signs of impending trouble be,
besides increased oil usage, lack of power, etc?
Inquiring minds...
Thanks,
Jerry Cochran
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Message 2
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| Subject: | Re: O-360A1A Longevity? |
Jerry,
The biggest issues with Lycomings relate to the cam & lifters. If an
engine has been properly maintained (changing the oil frequently, running
it 75-100 hours per year, with no significant down-times), it may go well
beyond TBO. Keep an eye on the filter and screen for tiny metal
particles (signs of cam lifter failure) and keep an eye on oil
temperatures and pressures. Fluctuations of pressures could be
preliminary indications of bearing problems (the next indication could be
a siezed engine, so this is important).
Most operators who go well beyond TBO are flying their aircraft well and
consistently. Another factor is chronolgical age. Gaskets and seals
can degrade (especially in a dry environment) and Lycoming suggests 12
years is a max. While many engines go beyond 12 years, anything rubber
(hoses, gaskets, and seals), may not make it that long. Even the rubber
manufacturers put an life expectancy on their products of 8-10 years.
There is, obviously a reason for these numbers.
Good Luck,
Tom
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Message 3
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| Subject: | Re: O-360A1A Longevity? |
I have 320 and it was starting to show ware on the mains at 1200. just dumb
luck it was found before the crank was ruined . The oil was changed on on
time. there was no abuse.
I also know of many 3000 hour engines.
I'm sure this is of little help, such as it is.
W.F. Taft
On Tue, Dec 9, 2008 at 2:24 PM, <Jerry2DT@aol.com> wrote:
> Folks in the know...
>
> Please weigh in on this. If one were to push the longevity of a 2000 SMOH
> O-360 by doing a top overhaul, what would be a reasonable expectation of
> time remaining? Given excellent care, would another 500-1000 hrs be
> unreasonable? I've seen various anecdotes of 3000+ hrs, and I realize there
> would be a ton of variables...
>
> If one did this, what would the best warning signs of impending trouble be,
> besides increased oil usage, lack of power, etc?
>
> Inquiring minds...
>
> Thanks,
>
> Jerry Cochran
>
>
> ------------------------------
> Make your life easier with all your friends, email, and favorite sites in
> one place. Try it now <http:010>.
>
> *
>
>
Message 4
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| Subject: | Re: O-360A1A Longevity? |
JC,
What kill our engines is corrosion.
Many say cam and lifters are the Achilles heel of all opposed Lycomings.
This might be so but modern oils formulation can and do take care of this.
Keep an eye on that oil pressure gage. Make a mental note of what is normal
under similar conditions. Every time "similar conditions" apply, check it
Slowly but surely, you will notice a decrease in pressure. Check what is
the minimum value prescribed and stop for a bearing change (conrod) at that
point.
Otherwise, if you can start it in the morning without much problem, keep
flying. A completely worn out power cylinder will still perform within 20HP
of the original value. Surprisingly, perhaps.
My O-320 A2B has about 650h SMOH. At 180 F oil temp / 300 F #3 Cyl. head
temp / 2100 rpm / Aviator 100 (monograde), the indicated pressure is 70+
psi.
Cheers,
Miguel Azevedo
N8714D
PA22/20-150
On Tue, Dec 9, 2008 at 2:24 PM, <Jerry2DT@aol.com> wrote:
> Folks in the know...
>
> Please weigh in on this. If one were to push the longevity of a 2000 SMOH
> O-360 by doing a top overhaul, what would be a reasonable expectation of
> time remaining? Given excellent care, would another 500-1000 hrs be
> unreasonable? I've seen various anecdotes of 3000+ hrs, and I realize there
> would be a ton of variables...
>
> If one did this, what would the best warning signs of impending trouble be,
> besides increased oil usage, lack of power, etc?
>
> Inquiring minds...
>
> Thanks,
>
> Jerry Cochran
>
>
> ------------------------------
> Make your life easier with all your friends, email, and favorite sites in
> one place. Try it now <http://mail.google.com/mail/010>.
>
> *
>
>
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