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Europa-List: Water pump removal « in aircraft »

 
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jeanphilippeneel(at)yahoo
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PostPosted: Sun Aug 05, 2018 8:41 pm    Post subject: Europa-List: Water pump removal « in aircraft » Reply with quote
John,
Je connais bien toutes les recherches de fuites que tu as faites sur le circuit d'eau. Elles mettent hors de cause toutes les durits et les colliers de ce circuit. Le radiateur d'eau est situé sous la tôle ou apparaissent les traces d'eau . Il est lui aussi hors de cause.
Il ne reste plus que la pompe à soupçonner:
- Le joint cuivre de la vis de vidange située sur le couvercle de pompe
- Le joint papier entre le couvercle et le corps de pompe
- Le joint tournant huile /eau en céramique. Ce type de joint est très utilisé en automobile . Il peut se fissurer et devenir source de fuites aléatoires comme sur ton moteur. On peut le remplacer mais cela nécessite de sortir le moteur et l'utilisation d'outils spéciaux.
Tu peux voir un schema en coupe de la pompe à eau dans le "Maintenance Manuel Heavy" section 75-00-00 § 2 et 3.
Amitiés
Jean-Philippe




Le Dimanche 5 août 2018 18h37, JohnFrance <77alembert(at)gmail.com> a écrit :
--> Europa-List message posted by: "JohnFrance" <77alembert(at)gmail.com (77alembert(at)gmail.com)>

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

--------
Europa mono Nr 192


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Nigel Graham



Joined: 23 Mar 2017
Posts: 36
Location: Winchester - UK
PostPosted: Mon Aug 06, 2018 5:08 am    Post subject: Re: Europa-List: Water pump removal « in aircraft  Reply with quote
One other potential cause of unexplained water loss is a porous cylinder head.
I have found this twice on early 912 engines, both in the number two head (front left and rear right (the same part number).
Water seeps through the castings between the water jacket and the exhaust port.
On aircraft that have been left standing for some time (this won't apply to you John!), it manifests itself as a white corrosion and blue deposit around the valve base - as viewed through the exhaust port.
Nigel

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