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Engines-lack of usage

 
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dean.psiropoulos(at)veriz
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PostPosted: Wed Feb 14, 2007 10:24 pm    Post subject: Engines-lack of usage Reply with quote

I'm not sure that I actually heard an answer to the question posed the other
day (feel free to kick me if I read right by it) so the real question still
remains.... is an engine that has been sitting for a couple years in a
hangar going to suffer from internal corrosion problems and have to be torn
down before starting?

How about a worst case scenario where a newly assembled engine is delivered
to the tropics and stored in a hangar that is not climate controlled. The
engine is pickled and plastic plugs have been installed in the openings but
some of them don't seal very well and there are no dessicant plugs
installed. Would a couple years under these conditions cause enough
corrosion that the engine would have problems if one were to just fill it
with oil and go fly it?

What kind of problems would one expect?

Is there any way to tell the extent of damage without major teardown or
cylinder removal?

What would you expect to see corroded inside (cam, rods, gears, crank) and
would you recommend not running the engine before an internal inspection?

Would there be a pre-start procedure you'd recommend before starting an
engine that has been subjected to these conditions?

Anybody done any testing of this sort and is there any data available on
just how bad it gets?

Would you trust such an engine not to fail in a short period of time if some
unsuspecting pilot just put it on his airplane and flew it?

What sort of failure mode would you expect and do you think the outcome
would be catastrophic (engine destroyed)?

Any words of wisdom here Monty Barrett (or anyone else with experience in
this area)? Thanks.

Dean Psiropoulos


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Float Flyr



Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

PostPosted: Thu Feb 15, 2007 8:23 am    Post subject: Engines-lack of usage Reply with quote

I think a lot has to do with how the engines were mothballed for storage.
Properly mothballed there should be no problems. Returning to service will
not just be a matter of pouring in some oil and heading out to the great
blue yonder. Cylinders should have had desiccant plugs and the base should
have been filled with preservative oil. The oil must be drained the engine
turned over with out the sparkplugs several times and then you can think
about putting fresh oil in. Installing plugs, possibly mags, carbs etc and
then there may, for a new engine, be a break in.

Best thing is to check the MM for the engine and any return to use
instructions that may have come with the engine. Pay particular attention
to the Maintenance Manual if you mothball the engine later.

Noel

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matrix02(at)shaw.ca
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PostPosted: Thu Feb 15, 2007 9:03 am    Post subject: Engines-lack of usage Reply with quote

My comment is on the storage of an engine or an airplane or any machinery in an unventilated hanger or garage. If there is no provision for vents under the ceiling or roof moisture collects from the dinural temperature variations and corrosion is worse than leaving the item outside where the moisture will dissipate. A hangar with uninsulated steel siding and a dirt floor compounds the situation. I have seen airplanes in unventilated closed hangars dripping with condensation.
The old wives tale that putting a car in a closed garage after washing it creates rusting is quite true. Domestic garages do not provide for any ventilation and the moisture does not dissipate allowing it to seep into crevasses and enhance corrosion.

Jim Aitken

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jrccea(at)bellsouth.net
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PostPosted: Thu Feb 15, 2007 3:38 pm    Post subject: Engines-lack of usage Reply with quote

It takes about 2 hours to pull and replace a cylinder so you can look inside
the engine. That's a good investment of time.

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jboatri(at)emory.edu
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PostPosted: Thu Feb 15, 2007 3:51 pm    Post subject: Engines-lack of usage Reply with quote

It shouldn't even take that long. And I agree, it's an excellent
investment of time. We had two off and inspected in a half hour:

http://userwww.service.emory.edu/~jboatri/magicbus/engine_teardown.htm

At 6:53 AM -0600 2/15/07, jrc wrote:
Quote:


It takes about 2 hours to pull and replace a cylinder so you can
look inside the engine. That's a good investment of time.

--

_____________________________________________________________
Jeffrey H. Boatright, PhD
Associate Professor, Emory Eye Center, Atlanta, GA, USA
Senior Editor, Molecular Vision, http://www.molvis.org/molvis
mailto:jboatri(at)emory.edu


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