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Engines-lack of usage

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dean.psiropoulos(at)veriz
Guest

Posted: Wed Feb 14, 2007 10:24 pm Post subject: Engines-lack of usage

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

Posted: Thu Feb 15, 2007 8:23 am Post subject: Engines-lack of usage

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



[quote] --

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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

matrix02(at)shaw.ca
Guest

Posted: Thu Feb 15, 2007 9:03 am Post subject: Engines-lack of usage

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
Guest

Posted: Thu Feb 15, 2007 3:38 pm Post subject: Engines-lack of usage

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
Guest

Posted: Thu Feb 15, 2007 3:51 pm Post subject: Engines-lack of usage

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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