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elbow into water pump leak

  • Kitfox Sport
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1 week 2 days ago - 1 week 2 days ago #20761 by Kitfox Sport
elbow into water pump leak was created by Kitfox Sport
Howdy, first post here
Rotax 912 uls has sprouted a leak at one of the bent sockets, or hose attachment inserts, into the water pump. See attached photo. The leak is minor but getting slightly worse with flight time. Engine has approx. 170 hours. Been sitting for past 3 years in heated hangar.

Will be changing out radiator soon, so will have coolant system drained.

Any ideas on how to slow, or stop, this leak without disassembly?

thanks and looking forward to much learning here

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Last edit: 1 week 2 days ago by Kitfox Sport. Reason: Water pump elbow better description

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  • stroudj002@yahoo.com
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1 week 1 day ago #20764 by stroudj002@yahoo.com
Replied by stroudj002@yahoo.com on topic elbow into water pump leak
Are you sure it is not leaking from the weep hole on the water pump? I think I see a coolant stain on the bottom of the water pump.

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  • Kitfox Sport
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1 week 1 day ago #20767 by Kitfox Sport
Replied by Kitfox Sport on topic elbow into water pump leak
I thought the same thing. nope. On the back side of the elbow in the photo I can definitely see the coolant seeping out. Could not get a good photo of that. I can also clean the area, come back next day w a clean q-tip and dab around the elbow and will pick up coolant seeping from around the insert area. None around the weep hole.

When I change out the radiator next week I plan on cleaning the area w gentle solvent like alcohol. Then blow dry the area and drizzle threadlock around the housing-elbow junction in hopes that it will seep IN and fill the void.

Again, the leak is minor at this time. Let me know what you think. Thanks

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  • Roger Lee
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1 week 1 day ago - 1 week 1 day ago #20769 by Roger Lee
Replied by Roger Lee on topic elbow into water pump leak
If it's just an ooze you can probably live with it without any issues. If it's more of a steady drip or constant leak then it should be repaired. If it is just an ooze then you'll have to keep a constant eye on it so it doesn't become a steady leak. It will probably get worse over time. Even an ooze drives me nuts so I repair everything.

Roger Lee
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Last edit: 1 week 1 day ago by Roger Lee.

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  • Kitfox Sport
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1 week 1 day ago #20770 by Kitfox Sport
Replied by Kitfox Sport on topic elbow into water pump leak
Yep will probably live w it. The Rotax Minute on coolant elbows provided great intel into the elbow assembly. Now that I know it is threaded in place I understand the situation better.

Thank you

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1 week 13 hours ago #20780 by bravo23c
Replied by bravo23c on topic elbow into water pump leak
Is it possibly coming from the elbow / hose connection? It is fairly common for coolant seepage to occur from under the hose, with temperature changes , when worm gear type clamps are used on the hose. Spring constant tension type hose clamps help with coolant seepage under the hose when the seasonal temperature changes .

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  • Kitfox Sport
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6 days 13 hours ago #20787 by Kitfox Sport
Replied by Kitfox Sport on topic elbow into water pump leak
Nope. Checked that carefully too. You see the regular hose clamp in the photo that I tried for a few flights. No leakage from under the hose w either hose clamp. I have the spring clamp back in place now.

Thanks for the input for sure. I’ll report back in couple weeks on how the threadlock works.

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6 days 12 hours ago #20788 by Bill Hertzel
Replied by Bill Hertzel on topic elbow into water pump leak

Lawdog wrote: ... When I change out the radiator next week I plan on cleaning the area w gentle solvent like alcohol. Then blow dry the area and drizzle thread lock around the housing-elbow junction in hopes that it will seep IN and fill the void...


You may be able to improve your possibility of success if you can produce a mild vacuum in the system.
A Shop-Vac temporarily Jury-Rigged to the coolant hoses would allow you to back flush the leak with alcohol.
Green Loctite is designed to wick past in-place threads.
A drop or two with the vacuum in place followed by another drop without the vacuum should guarantee full penetration.
The following user(s) said Thank You: kiwiatd, Kitfox Sport

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  • Kitfox Sport
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6 days 3 hours ago #20793 by Kitfox Sport
Replied by Kitfox Sport on topic elbow into water pump leak
Excellent suggestion. Thanks

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