Reply To: Ex Air ministry Alcon Pumps

[davidbliss]

Grahame
Both pumps seals might be ok, the old faithful has the just rubber washer and carbon ring running on a brass bush and is very quick to prime other has real good suction but takes ages to do so, the others carbon bush was robbed so thats got modern Alcon seal ceramic buts looks more to fail, never seen more than just over 20psi with those jets and with the two was putting out around 40, there is very little corrosion in the old faithful although in regular use and hardly ever dry, but the other is very badly pitted as stood years before I took it apart in the 60s so might have pumped something bit corrosive, engine is more or less in unused condition, All fittings have AM and crown and seem to remember same on the pumps but can’t find those, It would even rev higher I think as butterfly is only partly open. https://youtu.be/lMhDYL2Z_ag