Fordson Major Injector Setting

Grabatire

Member
What is the breaking pressure setting for the Fordson Major with the 220 cid engine and the Simms vacuum governor pump.

I just finished a complete rebuild on the engine. Before the overhaul there was considerable blow-by from the vent on the
rocker arm cover because of the low compression, and it slobbered from the drain hole on the exhaust elbow. After the
overhaul there is no blow-by but it still slobbers a bit and it still produces light blue smoke. It doesn't start near as good as my
other Fordson Major which starts great, has a clear exhaust and does produce dark smoke when pulling hard.

I had the injectors done, but I'm thinking the pump may not be up-to-snuff and can't handle the breaking pressure of the
injectors.
 
I don't have the manual for that engine, but my educated guess would be in the 2500-3000 PSI range. Possibly dieseltech or Al Baker would know for sure.
 
Thanks fellas.
If the injection pump can't develop the pressure to 'pop' an injector, would the injector just open slower causing it to deliver a stream or dribble rather than a mist? I'm thinking that if that is the case, then a lot of the fuel would be delivered to late for it to ignite properly. Thus the unburnt fuel/slobber.

Also, for what it's worth, there is no fuel coming from the return line that is connected to the top of the injectors. I wouldn't expect there to be much, but there's nothing. What does that indicate?

Bear with me guys, I'm a journeyman heavy duty mechanic but what we learned about fuel injection can be written on a pinhead, and I forgot most of that because I haven't worked with it.
 
If the injection pump wasn't developing enough pressure to pop open the injectors, by definition it wouldn't be running. Sounds to me like you simply need to break this engine in by working it hard for a while.
 
Correctly working injectors have very little return fuel back to the tank, just enough to lubricate the injector tip needle. Higher than normal return means one or more injector tips have excessive needle clearance. On JD two cylinder diesels the injector return does not even go back to the tank, but to the air intake. Question, what service did the cylinder head receive? If the valves and seats were ground the valves MAY be recessed too much, which kills the starting compression heat on diesels. I have three Ford 6000 diesels, two are stock and don't start/run well when cold. The rebuilt one will start at 30 degrees easily with NO ether or manifold heat, as the head has all new valve seats to place all valves flush to .010 ABOVE the deck surface. I'd do what Bern said, work the engine for awhile and see if it runs better.
 

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