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Cummins straight 6 diesel in a Hough 60-Priming Pump

L

lenray

Well-known Member
This 6 cylinder diesel in an old Hough H60 D Payloader.

Inside the cab there is a hand operated Priming pump--it is 5 inches long and says Cummins priming pump. On one side it says--INLET-- with a small beebee acting as a checkvalve. The other side goes to the underside of the injector pump.
It didn't work and I unhooked the hand pump.

I would like to hook it back up--anyone have a pic or can tell me how to hoook it up.

Is this hand pump a FUEL PUMP OR AN AIR PUMP
 
It ensures that after you service the fuel system, you can prime the system with fuel. It is a fuel pump, but usually I see them locally on the engine and not in the cab. The problem is that unless you are talking a Detroit Diesel with the unit injector, it is critical that you not have air in your fuel lines from the high pressure (injector) pump to the cylinder. The hand primer pump allows you to simply fill those lines with fuel after servicing it. It is generally optional, but if you have to bleed lines, you'ld wish it had one.
 
How old is this Cummins? Is it a Model J or a model H? Before Cummins went to the PT fuel systems in the 1950's they used a disk type injection pump. The disk type pump had to primed, but the engine had to be stopped in the correct position. On the pulley (same pulley that has the marks to adjust the injectors) on the short shaft there were 3 marks that said like PR ( If I remember right) 1-6, 2-5,3&4)Do a little looking I may have an old book. Find me on the HPOCA site or send me an email but maynot this week as we are shelling corn again weather permitting. Does it still have a disk type pump?
 
THIS ENGINE IS in the 60's maybe early 70's.
I have tractors with the hand fuel pump on the injector pump. This thing I have is completely different. It is set up for cold weather starts where there isn't electricity to warm the water.
It is in conjunction with a coil that can be heated from the batteries--there is a fuel pressure gage there also.
There were two hoses--small plastic--that go to the injector pump--one hose goes to the injector pump---I don't know where the other one goes. That is my question. The plastic hoses-lines - are about 7 ft. long.
thanks for the suggestions---keep them coming.
 
That pump is not for priming the fuel system,it is for cold start.On your intake manifold there is a glow plug,looks like a big spark plug.Sometimes guys would remove these and put a big plug in there and do away with this system,and just use ether.You would activate that,then pump the hand primer to around 125psi if I remember correctly.There is a little injector in the manifold next to the glow plug it would atomize the fuel as you pumped the hand pump and it would spray on the glow plug giving you a warm blast of atomized fuel while you were cranking.Not many people understood how to use these,but they actually worked quite well.Had a 335 back in the day,and unless it was really cold,between the this and the compression release,I could usually get it going.
 
Trkr that seems to be what I have on this old Hough..There were two lines hooked to the pull-push primer botton/

One line went to underneath of the injector pump and the other line wasn't hooked up--that line must have went to the fuel supply tank.

Not sure why the one line goes to the underside of the Injector pump. The way it was hooked up it would pump fuel into the underside of the injector pump.
Thanks for your help.
 
The one line going to the injector pump is the fuel supply to the primer.The other line should go to the injector in the manifold by the glow plug.
 
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