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runwayrex(at)juno.com
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 Posted: Sun Dec 17, 2006 9:15 am Post subject: OIl Leak / Lowell |
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Lowell and the rest,
A couple weeks ago, I mentioned that I had an oil leak in the front right side of my 912. I found it last week and think you guys may benefit from what I found. The oil pump housing had cracked right where the sending unit screws in. The sending unit is a pipe thread (meaning that it's tapered). Every time I snugged everything up trying to stop the leak, I opened up the crack a bit more. The oil pump housing is very thin right there and can't handle much torque on the sending unit. It's very difficult to get a torque wrench on the sending unit and the only way I think it can be done is with a wrench, a spring scale, and some math. The torque setting calls for 266 inch pounds. Lo and behold, last weekend, I opened up a Rotax list of recent service bulletins and they've changed the torque on the sending unit! It's been cut in half from 266 inch pounds to only 133 inch pounds. The manual calls for Loctite 221 on the threads which is difficult to find. I called LEAF and they said to use Loctite 242 which I have.
That cracked housing on the pump is not available separately. We have to purchase the entire pump to get it. Make sure you're sitting before you read the price of the pump. It costs $514 plus some change, tax and shipping. There's a fellow in our chapter who is quite a welder. He looked at it and has an idea of welding a spacer on to the housing where the sender used to screw in. Then, he's going to put a pipe thread in the spacer for the sending unit. He doesn't know yet if the type of aluminum is weldable or not, but he'll know by next weekend. I sure am glad that he's currently borrowing my HVLP paint system for his plane!
Next time you're looking at your sending unit, check out how thin the metal is on the pump on the engine side of the sending unit. I'm guessing that Rotax has had other pumps break in this same area, hence the reduced torque specification. If my friend can weld that spacer on, it will be much stronger. If not, I've got to buy a new pump. I hope this helps save some of you from this same problem.
Rex in Michigan
-- "Lowell Fitt" <lcfitt(at)sbcglobal.net> wrote:
--> Kitfox-List message posted by: "Lowell Fitt" lcfitt(at)sbcglobal.net (lcfitt(at)sbcglobal.net)
This brings to mind the data base I have collected on the flying Kitfoxes.
I will add you to the list and anyone else out there not on the list yet,
drop a note. Other data on the list is exact engine designation, third
wheel configuration, location and anything else particular to your airplane.
Also I would suggest that anyone building drop a note also as there is
plenty of room in the spreadsheet. It's just nice to see what we all are
doing.
Lowell
[quote][b]
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akflyer
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| Posted: Sun Dec 17, 2006 10:11 am Post subject: Re: OIl Leak / Lowell |
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I have used alumaloy in many applications ranging from boat hulls to VW blocks to boat props to transmitions and have had very good luck with it.
On some thicker metals I went with Mapp gas to get the heat input up, but most of the time you can just use a propane torch. Be carefull as aluminum does not give you much warning from being hot enough to weld / braze and turning into a glob of goo on the shop floor..
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lcfitt(at)sbcglobal.net
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| Posted: Sun Dec 17, 2006 10:46 am Post subject: OIl Leak / Lowell |
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Ouch!
Thanks for the report and the warning. Good luck on the welding project.
Actually I can't imagine 266 inch pounds on that fitting. It must have been
an original misprint. The prop bolts are less than that. And we are
talking high strength steel bolts here.
Lowell
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Fox5flyer
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| Posted: Sun Dec 17, 2006 2:18 pm Post subject: OIl Leak / Lowell |
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Great sleuth work Rexter in Michigan! When you have your newly manufactured part in place and checked out, give us a report.
Dekester in Michigan
do not archive
[quote] ---
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