AFC pins

[dzlpwr]

I tried finding a variety of pins to compare and there is no way of being able to look them up according to the number found on the bottoms. I think the only way to get ahold of them is to look up every single application in the Cummins parts catalog, and then find out which model VE was used on that engine and find the 10 digit Bosch part number for that particular pin. There is no particular pin used in the high HP marine engines which use the POD injectors. The reason being is that they use a Lucas pump and it has no aneroid. I could however find the pin used in the pump that uses the Bosch 185 injectors b/c I believe this is the highest HP engine available using the VE pump.

 

[SnoDawg]

Hey dzlpwr

I just took the top off of the spare pump I just picked up. The pin had a # of 13H. This pump is a cummins O/H The numbers on the tag is 3917002 M061401032 Which I was told was a non certified 177hp turbocharged, aftercooled, 2500 RPM, and peak torque 455 ftlbs @1500 RPM.

 

[JLEONARD]

SnoDawg,

Have you tried that pin in your rig yet?

Jay

 

[SnoDawg]

Not yet. Have to do a few home projects today being on Mid shift lots of things go on hold until days off. Will try later in the week if not too beat. .

 

[DBF]

SnoDawg,



I've got one of those 3917002 pumps myself. The Bosch p/n on it is 0 460 426 142. I don't recognize the M06... . numbers.



From what I've found to date, they were mainly used in Yard Jockey's.



DBF

 

[dzlpwr]

I used one of the pics posted by BushWakr to better explain myself here.



Today I took a look at a top cover of a VE pump to see if you really can gain any extra guide pin travel by grinding the AFC pin. Please refer to the photo to better understand me. The guide pin which "feels" the contour of the AFC pin is labeled as #4. This guide pin transfers it's movement to the "stop lever" labeled as M1. The stop lever determines how far the throttle can be moved, which in turn, decides how much fuel is available. I tried the AFC pin at both the stock position, and at its deepest point to see how far the guide pin can extend. The AFC pin i used is the one found in the 91-93 trucks. Number "70" if thats what you wanted to know.



Stock:

At no boost, the guide pin has almost no movement to the right. At full boost, the guide pin can extend about 3/4 of the way to the right. Remember that with the stock fuel settings this is sufficient b/c the full fuel screw will stop the throttle before the stop lever comes into effect.



Deepest point:

At no boost, the guide pin can extend just a small amount to the right. At full boost, or as far down as it can go until it hits the washer, the guide pin will completely extend to the right until the stop lever contacts the housing. The guide pin still has some travel until it hits the AFC pin but the stop lever cannot move any further.



Conclusion:

Grinding the AFC pin WILL allow more guide pin travel, but the stop lever is bottomed out. Therefore, NO MORE fuel is available by grinding the AFC pin. Remember that the guide pin is free floating and that it can extend outward even after the stop lever is bottomed out. This is why you will still see a mark from the guide pin travel on the deeper area of the pin. If any of you still think this is not true then go ahead and pull the cover and see for yourself. ( No personal offense intended here)

 

[Old Smoky]

OK.



So, why did I gain 3psi when I ground the stock pin at its deepest setting? Another member completely removed his pin for a quick test, and also gained boost. I could be wrong, but I believe that his control cone was also set to the deepest setting before the experiment. Can you explain this?



Mike

 

[BushWakr - RIP]

I should apologize for the lack of picture quality/clarity guys...



On the picture shown above, the item marked M1 is (if the picture was better it would show) labeled "pivot for 3".



Now, item #3 is labeled "Reverse Lever".

Now since my paper picture is better I can see a bit more detail... so my question is this...



Dzl'... . I can see a physical limitation on the guide pin travel based on the control cone contour/depth.

On the picture though, it appears that the top of the reverse lever works against the guide pin, while the bottom of that same lever is worked on/against the idle spring/adjusting lever, this adjusting lever is in turn affected/worked against by the Full Load adjusting screw.



If all that is correct, wouldn't it pretty much be impossible for the guide pin to be "free floating"... . ?? If you turn in the Full load screw you are directly impacting/pressing on the 'adjusting lever' which in turn passes that pressure on to the bottom of the 'reverse lever which then pushes on the guide pin.

So I guess what I'm trying to say is the guide pin seems to always be directly affected by the reverse lever.





Again, I know the picture quality is kinda poor for the labelling, and you need to look at a couple other pics for the missing components and their labels as well.



Bob.

 

[JLEONARD]

Can the stop lever be ground a little so it can travel farther?

This is the obvious next question of course.

Jay

 

[jbolt]

See if this image is better

 

[jbolt]

On my pump with the 70H pin and the control cone set to the deepest profile, the maximum guide pin travel is 0. 184"



By removing the sliding pin/ control cone and holding the throttle lever in the WOT position the reverse lever pushes the guide pin out to 0. 194"



Jay

 

[BushWakr - RIP]

Good quality pic jbolt...



The governor spring will/should affect the pumps ability to maintain full fuel longer. At least that's how it looks in my pics.

The tougher gov. spring will hold the tensioning lever, tensioning lever stop, against the sliding sleeve, which in turn will resist the outward extension of the governor springs. In doing this the control collar is held in the 'full fuel' position longer, before RPM finally forces the weights out, which moves the sliding collar upward (to the right in the pic) and that in turn draws the control collar back, exposing the 'Distributor-plunger cutoff bore'.

When that happens, defueling takes place.



My point in resonding to dzlpwr was that it 'appears' the guide pin is not truly 'free floating' or perhaps I took that too literally... . sorry if that's the case dzlpwr.....



Just another thought/observation on this whole thing... .

Since one of the things we're looking for is more available fuel overall. (aside from a higher defuel point, that is. )

On the 2nd gen pumps the fill time is altered to allow for more fuel availability... . so,, how do we increase 'fill time' on this pump???

Thoughts???



Bob.