Rebuilt Pump - Still leaking around gasket

[Mjkarabela]

Hey Fellas,

I got this old Duro K-255 piston pump. Last night, wasn't holding prime over night, so took it home and rebuilt it. However, there is still like 5 drips per 20 seconds coming out around this gasket, not under pressure. The mating surfaces are a bit pitted, but I was hoping the gasket would take care of the imperfections. I've never rebuilt pumps before, the cottage is 2 hours away, is this normal after a rebuild? Will the little holes rust up and clog and we'll be OK for another couple years? Or if I put it underpressure is it going to spray like a spray nozzle on a hose when it's not on properly?

I'm thinking the only other option is to get the surfaces machined...

 

[Valveman]

Looks like that is on the low pressure side? If so, that is why you are losing prime. Probably won't rust up and stop leaking with a gasket between the surfaces. Silicon the gasket and let it dry.

 

[Sponsor]

 

[Mjkarabela]

Thanks for the input. Not sure if it's the low pressure side or not - this is basically the pump

So I should:

1 - Take it back apart.
2 - Clean the surfaces.
3 - Put a small bead of silicon on both sides of the gasket. Any particular type of silicon I should use?
4 - Put it back together while it's still wet
5 - Let it dry

and voila?

I was also thinking putting some JB Weld on the surfaces, and then sanding it smooth.

 

[Valveman]

Yes. You can get RTV type stuff made for gaskets. Don't quite get it tight until after it has dried, then snug it up.