Author Topic: Gov mod failure (Read 6387 times)

zukgod1 · « **on:** July 21, 2008, 05:00:20 pm »

Ok so here's the deal.

I did the gov mod, twice now.

I went as far as to place 2 of the OE springs in it where the larger spring is. Dang thing still cut fuel @ 3800rpm.?!
I took it apart again, placed a piece of HARD fuel Line in place of the springs, was a PITA to the the little clip back on. test drive, still cuts out @ 3800..

WTH!?

Before all this I had the hose in the gov and the below done, I had placed a 10 mm head on it and didn't get the new springs, I shimmed them and cranked in the fuel screw to compensate, idled funny but ran like a raped ape. Decided to re-shim the springs a bit more so I could back the fuel down (was toasting turbos as you remember) re assembled using same governor set up and cut out @ 3800.

What the heck am I doing here?

I've added a small pusher pump to make sure fuel was getting up there in case the vanes were getting worn, I tested this by taking the pusher pump out for a test run and it was no different. I've added a larger fuel filter set up off a Dodge Cummins for added capacity and same results.
I don't get it.

Any sugestions? Other than send it to Giles that is. If I had $1000.00 I would have already sent him a pump to build. I have 4 for hecks sake.
Maybe he needs some cores and could cut me a brake if I give him 4 cores, hmmm...

Vincent Waldon · « **Reply #1 on:** July 21, 2008, 06:27:25 pm »

Are you shimming both springs ?

zukgod1 · « **Reply #2 on:** July 21, 2008, 06:29:20 pm »

Yes, I shimmed the smaller spring just a little in all instances, no different.
I also tried it without the shim on the smaller spring, nothing..

gigaz2 · « **Reply #3 on:** July 21, 2008, 07:35:24 pm »

I also shimmed my main spring and found no big difference

while disassembling my pump I noticed I have the lime green spring on the timing.
can it be that it advances to the max and then after ~3800rpm it needs more and there isn't any more advance possible?

just a thought

(I can't read rpm right now

must get it to work )

EDIT: I was thinking about the SAE paper, the advance curve figure, with a softer spring (lime green being the softest) gets steeper, but hits the max advance earlier. perhaps we need a bit more max advance.

zukgod1 · « **Reply #4 on:** July 21, 2008, 11:44:03 pm »

I have a fuel delivery problem, the fuel obviously backs down.

Starts to back off @ 3500 and by 3800 I'm done.

jimfoo · « **Reply #5 on:** July 22, 2008, 12:10:26 am »

Could you have a blockage internally in the pump? Does it make any difference if you increase the internal pressure? It would be handy if you could watch it while you drive.

zukgod1 · « **Reply #6 on:** July 22, 2008, 12:44:24 am »

I don't think there is a blockage, wouldn't it show all the time instead of just higher rpm?
I don't dare adjust it without a gauge so I can see where I am now.

I mean it works fine other than it shuts fuel off.
I guess I had better make a out bolt with a port for pressure. I could wedge it under the wiper for testing I guess.

zukgod1 · « **Reply #7 on:** July 22, 2008, 02:06:32 pm »

Bump up for more ideas.

burnt_servo · « **Reply #8 on:** July 22, 2008, 03:25:34 pm »

the 2 long threaded screws on the top of the pump , the one near the engine can be used to control idle speed , the other to limit the travel at full power ....

if you haven't yet , back the second screw ( the full power one ) out till it no longer limits the throtel levers travel .

zukgod1 · « **Reply #9 on:** July 22, 2008, 03:52:36 pm »

It doesnt matter where my foot is. I can be at half throttle and when it hits the 3500 range fuel starts to cut out so it's not that.

What I mean is I can be just bairly going in say 4th gear and push to 1/2 throttle and when the tach says 3800 your done, that's all she wrote, no more fuel, nada...

Same would be if in 5th going say 60 mph, I shift down to 4th to get past someone and it hits 3800 and I have to shift if I need to go any faster.

zukgod1 · « **Reply #10 on:** July 22, 2008, 04:02:30 pm »

Sure theres a chance I guess..

You are referring to the shaft the gov slide on correct?

I could probably take out the banjo fitting for the inlet, pressure regulator and the tiny banjo where that little bypass tube is, remove the top of the pump and use compressed air to blow through the holes without having to remove the pump... Hmmm..

zukgod1 · « **Reply #11 on:** July 25, 2008, 12:51:23 am »

Ok took the top off the dang thing, removed the tiny banjo bolt that holds the tube from there to the timing cover. Blew air through there which caused it to come out the pilot hole in the shaft. I slid the black plastic housing that rides on the shaft back and forth and it would allow more air as I slide it towards the back of the pump. made sure there wasn't anything in the banjo bolt and basically just looked at everything, checked out the gov assy, looked at the area where the gov pushes on the fuel delivery assy, I didn't see anything different or wrong So I re assembled everything.
Had to reset the fuel of course and set the idle, took it for a drive, same damn thing.

Fuel just dies off @ 3800 rpm. I just don't get it.

What the heck is going on.

Steel sleeve is still in place and tight and the middle spring is shimmed almost a full 1/8".

Any suggestions?

I'll pull the pump off again if someone will tell what to do here. I'm out of ideas.

dillenger1 · « **Reply #12 on:** July 25, 2008, 08:20:32 am »

Do you have a picture of the spring assembly?

Tintin · « **Reply #13 on:** July 25, 2008, 09:14:00 am »

Quote from: "dillenger1"

Do you have a picture of the spring assembly?

Yes, post a photo of your governormod and you other mod if you can.

When you say ''cutt of a 3800rpm'' you can clearly see no smoke going out the tailpipe, or its just a feeling of flat power when you get 3500....... 3800rpm?

MouseGTD · « **Reply #14 on:** July 25, 2008, 11:57:49 am »

i had a problem with my car cutting out between 3.5-4k rpm, it turned out to be a loose wire on the fuel pump. maybe it could just be some thing simple like this? i checked/replaced or cleaned most of the fuel system from the pump back to the tank with no difference before i found the loose wire :roll: