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Richard Pike
Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee
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 Posted: Sat Sep 25, 2010 8:42 am Post subject: Busted crank? |
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The FSII is slowly closing in on getting finished but I have noticed something I really don't like. There is oil dripping out of the hole in the crankcase below the mag, and the little bottle of oil that is part of the lubrication system for the water pump and the rotary valve is slowly losing oil. Will be pressure testing the crankcase soon, but I am thinking busted crank. Maybe in 2 places - in the center section - which would account for the leak out of the center section - and also behind the mag, which would mess up that seal as well and allow the oil to drip out from behind the mag.
Anybody got any more optimistic opinions?
Richard Pike
MKIII N420P (420ldPoops)
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williamtsullivan(at)att.n
Guest
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| Posted: Sat Sep 25, 2010 9:11 am Post subject: Busted crank? |
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Richard- I suggest you also post your question to the Rotax List. Roger Lee will pick it up there, too. Good luck.
do not archive
Bill Sullivan
Windsor Locks, Ct.
FS 447
[quote][b]
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Eugene Zimmerman
Joined: 10 Jan 2006
Posts: 392
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| Posted: Sat Sep 25, 2010 4:47 pm Post subject: Busted crank? |
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Richard,
The most likely cause of that problem is worn rotary valve shaft
seals. The weep hole will seep either coolant, or rotary oil,
depending on which seals on that shaft leak.
It is very unlikely that the weep hole leak is a crank problem.
I have a slight oil leak in mine also and add a slight bit of oil to
the reservoir once or twice a flying season. But a tiny bit of oil
can make an big ugly mess on the side of the engine so I put a small
WD40 straw in the weep hole and sealed it in with RTV and then run a
small primer line from there down and out the bottom of the cage
where it simply drips a drop or two on the floor when it sits in the
hanger. Mine seems to leak mostly while is is parked rather than when
the engine is running.
Check out a parts breakdown diagram to visualize the rotary valve
seals and the water pump seal.
Gene Z
On Sep 25, 2010, at 12:42 PM, Richard Pike wrote:
| Quote: |
The FSII is slowly closing in on getting finished but I have noticed
something I really don't like. There is oil dripping out of the hole
in the crankcase below the mag, and the little bottle of oil that is
part of the lubrication system for the water pump and the rotary
valve is slowly losing oil. Will be pressure testing the crankcase
soon, but I am thinking busted crank. Maybe in 2 places - in the
center section - which would account for the leak out of the center
section - and also behind the mag, which would mess up that seal as
well and allow the oil to drip out from behind the mag.
Anybody got any more optimistic opinions?
Richard Pike
MKIII N420P (420ldPoops)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=313706#313706
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Richard Pike
Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee
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| Posted: Sat Sep 25, 2010 6:39 pm Post subject: Re: Busted crank? |
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The oil is not coming out of the weep hole, it is coming out around the seal behind the magneto. Lots of it. More than ought to be in that portion of the engine, and meanwhile, the little plastic bottle reservoir for the center section has gone down about a third.
Maybe just coincidence, maybe the little bottle is lower because the engine has sat leaned over for 18 months, and maybe the oil seeped into the engine through the banjo bolt/check valves from the oil injection tank, maybe... ?
Will be pressure testing the cases Monday, will know more then. Expecting the seal behind the mag to fail, will be looking for other indicators.
Richard Pike
MKIII N420P (420ldPoops)
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Richard Pike
Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee
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| Posted: Mon Sep 27, 2010 11:29 am Post subject: Re: Busted crank? |
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Curioser and curioser...
Pulled the engine off the airplane this morning and found some interesting things. In the bottom of the case below the magneto was a little gloop of old black nasty oil, but no clean oil such as has been accumulating below the engine.
Pressure tested the engine and it came up tight as a drum. Checked the crank for variation between the front and back cylinders and both of them were at TDC when they were supposed to be. So the good news is, the engine has nothing (apparently) wrong with the crank.
Everything is just about all back together, guess I'll top everything up with oil and wait to see what happens next...
Richard Pike
MKIII N420P (420ldPoops)
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Eugene Zimmerman
Joined: 10 Jan 2006
Posts: 392
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| Posted: Tue Sep 28, 2010 4:54 am Post subject: Busted crank? |
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On Sep 27, 2010, at 3:29 PM, Richard Pike wrote:
| Quote: |
Curioser and curioser...
Pulled the engine off the airplane this morning and found some
interesting things. In the bottom of the case below the magneto was
a little gloop of old black nasty oil, but no clean oil such as has
been accumulating below the engine.
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Richard,
After the engine's last experience, the engine probably just needs its
"underwear" changed. 
| Quote: | Pressure tested the engine and it came up tight as a drum. Checked
the crank for variation between the front and back cylinders and
both of them were at TDC when they were supposed to be. So the good
news is, the engine has nothing (apparently) wrong with the crank.
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Feels kind of like the medical report of a colonoscopy when it comes
back showing "negative".
Good luck and happy motoring!
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