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Water pump removal « in aircraft » XS

 
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JohnFrance



Joined: 17 Sep 2014
Posts: 50
Location: Grenoble France

PostPosted: Sun Aug 05, 2018 8:30 am    Post subject: Water pump removal « in aircraft » XS Reply with quote

Hello,
I have an intermittent coolant leak on my classic which has a XS firewall forward package.
Is it possible to remove the water pump from the engine while it is in situ on the aircraft?
In spite of doing pressure tests, running the aircraft with the cowlings off I have been on the unable to trace the origin of the leak, it does not leak cold with a pressure of 1,4 bars.
On some flights there is no discernible leak, on others I have lost up to 150 ml during a two hour flight.
There is a bit of a white deposit on the exhaust heat shield underneath the water pump. I have also found liquid on the aluminium plate above the radiators but the air passage through the radiators has always been dry.

I would rather be sure of where the leak is coming from prior to taking anything apart. Does anyone have some experience or knowledge they could share with me?

Regards,
John


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graeme bird



Joined: 15 Jul 2010
Posts: 398

PostPosted: Sun Aug 05, 2018 11:55 am    Post subject: Re: Water pump removal « in aircraft » XS Reply with quote

I have had two leaks on mine; the first was from new and on the port side 1" pipe joint above the radiator, I concluded when shutting down the water, no longer circulating, heated here from the exhaust and engine and wept out of the vertical joint. I changed to silicone pipe, wrapped it in insulation webbing and used a better quality clamp.

The second leak was a tiny hole in the radiator.


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Graeme Bird
G-UMPY - Mono Classic/XS FFW 912S, Woodcomp SR3000/3W CS, trutrak Gemini 2 axis AP, PAW, PFLARM core, ads-b out, 8.33khz, mode S, FP-5, Aera500, SD on Nexus, Smart A3
350 hours & 6 years on the Mono, 930 total
g(at)gdbmk.co.uk
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tennant



Joined: 19 Apr 2011
Posts: 106

PostPosted: Tue Aug 07, 2018 3:47 am    Post subject: Re: Water pump removal « in aircraft » XS Reply with quote

Hi John,

There is a drain hole under the water pump which is designed to allow water to exit that has passed the water pump seal, so that it does not enter the crankcase through the oil seal.
The Manual Shows an engine Strip down to Change the seal but I have done it in situe from under the plane. A fiddle, but possible.
Mine is a 912 on a Classic mono so your Access could be different.

Best of luck

Barry


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