FYI Inside pics of the AFC

[jbolt]

For anyone who has not cracked open their AFC diaphram to make adjustments I took some pictures today of the insides.



See them here AFC Pics



Jay

 

[formula]

Jay,

Great pictures. They will surely be helpful to others who want to make adjustments to the AFC. It's always better to see what things really look like. BTW, looks like your smoke screw is backed way out... ... crank er in a turn or three



Cheers,

Sean

 

[JLEONARD]

Looked at a couple of those today.

They ain't where they were, that's for sure.

 

[b.ferrara]

jaybolt, we turned up mine a bit, 1/2 turn on star wheel, 1/4 turn on pin, what do you think? Any advice, thanks Bill

 

[CAROLINA CUMMINS]

Hey guys,



Question about idle speed, does it change when you adjust the AFC and them other ones besides the full load screw?I know it changes the idle speed. Also the diaphragm, 90 deg clockwise is max fuel right?, can you turn it less than 90??





Thanks steve

 

[formula]

Steve,

Turning the control cone and adjusting the spring tension with the starwheel will not change the idle speed. The 90 degrees is a bit arbitrary as the stock settings vary. I had to turn mine 120 deg to reach the steepest profile on the control cone. Just take out the control cone and look at the profile as you rotate it to see where the steepest profile is located. Also, before you adjust it, make an index mark on the diaphragm and the AFC housing with a permanent marker. This way you'll know where your stock setting is (was ) so you'll be able to put it back if you wish and so you know how far you've turned it to make your adjustments.



Sean

 

[jbolt]

b. ferrara- I am by no means an expert on this. I am myself just getting my feeble mind wrapped around how all the different adjustments work together. As of now all I have done is advanced the timing, adusted the idle after I put in the POD injectors and only this weekend started to play with the AFC. Have you done any other modifications other than some pump adjustments? Injectors, turbo, exhaust?





CAROLINA CUMMINS- My idle did not change after moving the eccentric pin. I am told it will change when I adjust the full power screw. I would pull the eccentric out and see where it is currently set. Mine was not on the lowest setting but about 1/8 of a turn. From the shape of the eccentric the range from low to high is 1/2 turn. Right now I'm at 3/8 turn.



Jay

 

[jbolt]

Formula- Now I know how Old Smokey feels



Jay

 

[formula]

:-laf

 

[Old Smoky]

LOL:-laf



Mike

 

[KEENO]

Lube....

I've asked this before.....



Does anyone what kind of lube/grease Cummins recommends for the pin?



When my injector pumped failed it was because of a non functioning Fuel Rate Delivery Pin. I think a bit of maintenance & lube might prolong the life of the pump.



Just a thought... ...



KEENO

 

[BushWakr - RIP]

GTSU Keeno !



I have always used some synthetic grease on the cone body to help ease the wear and help reduce the friction of the pin on the cone. Just a tad is good.

As for the delivery pin itself, I believe there is an o-ring that the pin goes thru, on the inside of it's hole.

I havent' used any lube of any kind in there. If I were to use a lube of some sort I'd be sure to pick something that would not dry out or get varnishy so to speak. Also, I think it would be critical that the lube be totally safe to use on rubber. If the o-ring gets brittle or hardens up (which causes the pin to stick) you would do more harm than good.

I have read a comment or two that it should not be flamable too... although I don't think that would be a big issue to be honest.



I guess what you'd want to look for was something designed to keep the rubber soft and pliable, or atleast retain it's natural characteristics without detiorating it in the process.



Just my thought on this, and I'd be glad to hear from a pump specialist myself...



Bob.

 

[jbolt]

KEENO- what was the rational that the FRDP caused the pump failure or at least contributed to it? I'm trying to grasp how this could cause it.

 

[Midnite]

Re: Lube....

Originally posted by KEENO

I've asked this before.....



Does anyone what kind of lube/grease Cummins recommends for the pin?

In the past Power Wagon has recommended WD-40.



Mike

 

[CAROLINA CUMMINS]

Thanks.









Steve

 

[KEENO]

Maybe I've mis-spoke a bit in my past post.....



When my pump was dis-assembled it was determined that the FRDP was siezed..... Therefore, providing poor performance at anything but "Full Throttle". All of the Fuel had to be delivered thru the "Max Fuel Curcuit/Screw". It was a slug!



Correction: The pump never actually "Fail"..... as in, leaving me stranded.



I have since been concerned about keeping some lube on the pin hopefully preventing a repeat performance/failure. If the FRDP is actually sealed by an O-ring as "Bush" suggest... ... I'm not certain that the lube is actually having an effect on the FRDP.



I did however put a small dab of Teflon grease on the pin last time I had the AFC apart.



Sorry for any confusion.....



KEENO