I had a 92 D350 5 speed with 3.54 up until november of last year. I had backed the screw out all the way until the end that had been sticking out was flush. I never noticed a difference in idle, I even tightened up the accelerator linkage. It made a huge difference. Ran it hard all summer and never even tried to get hot, unless that is of course I put the pedal on the floor for a couple of miles . Just wondering though if I backed the screw out too much because I still have a 90 pre intercooled 3 speed auto and I have the screw backed out on it too but just not as much. It will run too though. Got it up to a about 95 mph, I think thats pretty good considering it has no overdrive.

Any info will be appreciated, don't want to burn up any pumps or engines!!

jwill

 

I think you must be adjusting the high speed governor scree, not the "fuel" screw. The high speed governor screw adjusts how far the accelerator lever on the pump will travel, and adjusts the maximum governed speed of the engine. The fuel screw is on th eback of the pump, in toward the engine block, and determines how much fuel the pump can deliver per stroke. . .

It seems as though you can run these engines up to 3000-3300 rpm without any trouble, so I would guess that youare okay with your adustment.

 

I looked on the diagram in the Tech Facts section but I don't see a Govenor screw. I thought you had to change a spring inside the VE pump. Where is the govenor screw located? Mine governs at a low speed and it would be nice to stretch out 2nd gear some more.

Edwin

 

The high speed governor screw is the horizontal screw on the fender side of the pump, that the accelerator lever stops against. To REALLY get full fuel up to 3200 rpm, you have to change the spring, but just to extend the governor "droop" up to 3000 rpm, you can adjust that stop screw.

Hope that helps -- don't have a picture w/ an arrow handy.

 

I can probably find that one OK. Mine just stops climbing when I get on it in second and it's disconcerting because I can't get it into third fast enough to get on down the road. It geared so that 1st is to low to start off in unless you have a load and second is almost to low. I can almost start off in 3rd.

As long as I'm just tooling around it's no problem but if I want to get off the light quick to cut over in front of somebody it kind of falls on it's a**.

I'll try that screw and see if it will improve matters. The pump has already been tweaked though so I may not have any luck.

Thanks

Edwin

 

edwin,
if you crank the afc spring down a bit, she'll spool up quicker when you hit third. My full fuel screw had been turned when I got the truck, but nobody was ever in the afc housing. Some tweeking in there made the 'ol girl MUCH more driveable around town...you just have to be willing to fiddle untill you strike the balance between spunky and smokey! My 18.5 housing doesn't lag much the way I tuned the pump, but I don't forsee many mosquitoes this summer, either
greg