alienturtle
Human
Now i know all of you opened this thread hoping that you would see the insides of a ford injection pump. Sorry to disapoint you but what you will see here is a Bosh VE rotary pump from my 5.9 cummins. I decided to post this is the IDI forum because it is REALLY neat and im going to try to explain how a rotary pump works and show you some parts of it. These guys are known to leak from the throttle shaft o ring so i purchased a bosh rebuild seal kit and just decided to do the entire thing. I have never pulled one apart before and i know people about doing it but i say go big or go home
First i will start with the fuel pin. In a VE pump this is how they meter fuel based on boost pressures. A rubber diaphram attaches to the top of the pin and then goes into the top of the pump. Boost pressure from the manifold is pushed on top of the diaphram which pushes down on the pin in the bore. as you can see the ramp on the pin starts fat at the bottom and gets less and less as it goes up. Inside the pump there is a little pin that sticks out of the bore and rides up and down on this ramp of the fuel pin. On the left you have a stock un modified fuel pin. On the right you have a DennyT stage 2 fuel pin. Big difference in ramps. the more that fuel pin gets pushed down, the more the pin in the bore moves outward the more fuel you are flowing
Here we have the pump pretty much torn down
This is a picture of what they call the "full fuel adjustment" Its the same thing as the little allen key inside our ford pumps. From the factory you can see the "stop collor" that they spot weld to the screw so you cant turn it up anymore. With the help of a screw driver and hammer the collor busts right off and you can turn the pump up even more
Here is the actual pump with the AFC top removed. (AFC is the piece that the rubber diaphram and fuel pin ride in) The gear you see if the governor gear and weights. As RPMs raise the weights go out pushing on a shaft which pushes on the govnr assembly. The govn assembly is the black square thing in the second pic. Now these trucks stock have a 2700rpm govn spring in them that pushes back on these weights. You can change this spring out for a "366" spring that moves the gov rpm up to 3200RPM
Down inside the very bottom of the pump is the vains of the actual pump. Looks exactly like a rotary holly fuel pump. Attached to that is the actuall shaft you see on the outside of the pump
First i will start with the fuel pin. In a VE pump this is how they meter fuel based on boost pressures. A rubber diaphram attaches to the top of the pin and then goes into the top of the pump. Boost pressure from the manifold is pushed on top of the diaphram which pushes down on the pin in the bore. as you can see the ramp on the pin starts fat at the bottom and gets less and less as it goes up. Inside the pump there is a little pin that sticks out of the bore and rides up and down on this ramp of the fuel pin. On the left you have a stock un modified fuel pin. On the right you have a DennyT stage 2 fuel pin. Big difference in ramps. the more that fuel pin gets pushed down, the more the pin in the bore moves outward the more fuel you are flowing
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Here we have the pump pretty much torn down
You must be registered for see images attach
This is a picture of what they call the "full fuel adjustment" Its the same thing as the little allen key inside our ford pumps. From the factory you can see the "stop collor" that they spot weld to the screw so you cant turn it up anymore. With the help of a screw driver and hammer the collor busts right off and you can turn the pump up even more
You must be registered for see images attach
You must be registered for see images attach
Here is the actual pump with the AFC top removed. (AFC is the piece that the rubber diaphram and fuel pin ride in) The gear you see if the governor gear and weights. As RPMs raise the weights go out pushing on a shaft which pushes on the govnr assembly. The govn assembly is the black square thing in the second pic. Now these trucks stock have a 2700rpm govn spring in them that pushes back on these weights. You can change this spring out for a "366" spring that moves the gov rpm up to 3200RPM
You must be registered for see images attach
You must be registered for see images attach
Down inside the very bottom of the pump is the vains of the actual pump. Looks exactly like a rotary holly fuel pump. Attached to that is the actuall shaft you see on the outside of the pump
You must be registered for see images attach