39 D2 fuel transfer pump

Hi Chris,
I would try a thin neoprene rubber washer glued to the sealing face of the valve if the sides are in fair condition.
For the spring I would take the rusty remnants to a local NAPA or similar store and see if you can match something similar in coil wire sectional diameter and the coil size itself. If it is too long just trim to suit.
You are looking for around 25 PSI working pressure in the filter tower--as read on the fuel pressure gauge for the white/green area. If you are down on pressure with clean filters then stretch the spring a bit to see if you can raise the pressure or just live with what you have as you should not be looking for full diesel engine rated output on these old girls but will be close to it.
It will work fine with around 20 psi.
If the parts are not available from Cat then you can get The Dealer to request the drawings for the parts.
Hope this helps.
Cheers,
Eddie B.

My thoughts also for the spring, but good advice for the piston. Thanks. Also for the numbers. thanks again Chris

May be able to polish the plunger by spinning in a lathe or drill. Not sure what the sealing/seating surface is made of, but maybe brass which might be polished?

Hard stuff, looks like stellite. Something isn't kosher though. put in a spring, cleaned everything up gently lapped piston to seat just enough to get the rust off and ....... no fuel pressure. Gears good, housing looks good Don't know what else to try.

Secondly, took the adivce of earlier responder about pressurizing fuel tank to bleed system. Worked great for 1 & 4 but can't get anything out of 2 & 3. Tried it with pony rolling engine and tank pressurized to 20# and still nothing from center two injector pumps. Haven't even tried to bleed the lines to the injectors yet.

I think the submarine diesels were much easier to work on. LOL

Check for hung up plungers on 2 and 3.

I'll try it

Thanks

Is the Fuel gauge any good?
If you put 20psi on the fuel tank, the gauge should be responding.

[quote="drujinin"]Is the Fuel gauge any good?
If you put 20psi on the fuel tank, the gauge should be responding.[/quote]


It does work. it's not the problem for sure. Took the part numbers given above to cat and they were able to find them and will be here friday.

Thanks again. We'll see if I can get this straightened out and if so will post for others.

Chris