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carlisle
Joined: 20 Jun 2009
Posts: 72
Location: Sioux Falls, SD
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 Posted: Tue Jun 30, 2009 3:11 am Post subject: Change front crank seal |
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Can I inspect/change the front crank seal on my 582 with B gearbox while on the aircraft (kitfox)?
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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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| Posted: Tue Jun 30, 2009 10:23 am Post subject: Re: Change front crank seal |
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| carlisle wrote: | | Can I inspect/change the front crank seal on my 582 with B gearbox while on the aircraft (kitfox)? |
well since noone's answering... You have to split the crankcase to get the crank seals in and out. They have teats on them that rides in grooves in the crankcase halves so (thankfully) there's no way they can be removed or installed without splitting the halves.
When you do install the new ones, be sure the little teats don't cover up the flow holes in the halves. i.e. orient the seals and them mark where they are with a marker. Then check the alignment of the marks once you close the crankcase.
LS
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LS
Titan II SS |
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carlisle
Joined: 20 Jun 2009
Posts: 72
Location: Sioux Falls, SD
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| Posted: Tue Jun 30, 2009 3:29 pm Post subject: Re: Change front crank seal |
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Thanks. I didn't think I'd get away that easily.
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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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| Posted: Tue Jun 30, 2009 3:33 pm Post subject: Re: Change front crank seal |
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| carlisle wrote: | | Thanks. I didn't think I'd get away that easily. |
If the crank seals are leaking, i.e. the runny fluid is coming out pretty steadily, you're better off doing a full teardown/cleanup/reseal. By the time you get the crankcase apart, the whole engine is generally apart anyway......
Might as well do a full service at the time....
LS
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Titan II SS |
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carlisle
Joined: 20 Jun 2009
Posts: 72
Location: Sioux Falls, SD
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| Posted: Tue Jun 30, 2009 8:09 pm Post subject: Re: Change front crank seal |
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It's not that. I just have a little bit leaner mixture on the front cylinder and wonder if it might be sucking a little extra air. The crankcase itself appears absolutely water tight and there are no visible leaks whatsoever.
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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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| Posted: Wed Jul 01, 2009 6:44 am Post subject: Re: Change front crank seal |
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| carlisle wrote: | | It's not that. I just have a little bit leaner mixture on the front cylinder and wonder if it might be sucking a little extra air. The crankcase itself appears absolutely water tight and there are no visible leaks whatsoever. |
Ah ok... Well when the mag-end seal starts to leak, the diagnostic is black stuff collecting on the bottom of the fan housing. In particular, the seam where the housing mates to the crankcase - it starts off as a thick-ish black goo in that seam and eventually becomes droplets of black fluid collecting there after a flight. That happens while the seal is still sealing relatively well so it gives you some time to take the engine down and service it before it starts to leak dangerously. The Rotax seal has a Viton coating on the lip which stiffens it and helps prevent catastrophic failure. The drawback is it starts to leak earlier than a seal without the Viton coating on it (in my experience at about 100 - 110 hours).
You can check the general condition of the seal tho with just a visual inspection of the bottom of the fan housing (assuming a cylinders-up installation that is).
In my experience, once you get the droplets of black fluid it's time for a teardown and reseal....
LS
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Titan II SS |
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