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94-98 12V Cummins 5.9L P7100 Tech Talk '94-'98 5.9L Cummins 12-Valve P-9100 Tech Articles

I hope he has a pyro...... JOIN NOW TO REMOVE TRACER

Turning Up A 12 Valve

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Old 12-22-2007, 03:54 PM
Dr. Evil's Avatar


I hope he has a pyro...

Dr. Evil's Sig:
98 12V quad cab 4X4 AND 2001 24V quad cab 4X4

Old 12-23-2007, 10:52 AM
Diesel Enthusiast



ya, but i got to thinkinhg the other day who actually watchtes it , im sure lots do wen towing but i really doubt any ever really watches it racing, i know i dont , i just always had them to be cool

TEXASPOWER's Sig:07.5 3500 hd 4x4 4door dualy LMM quad stealth 2 Phantom II's no smoke go away thingy

bye bye-2006-ctd 4x4 3500 6spd quadcab dually
dynoed april 1st 547hp/1375lbs trq

05 F350 4X4SPORT EDITION BLACK mbrp straight pipe
6 285/70/17 cooper stt's with 2inch spacers triple dog stacked with dr performance stage II
quad comander

09 F350 6.4 6 speed 4x4

Old 12-23-2007, 12:27 PM
wyoranch's Avatar
Diesel Wrench



Well, we're ordering a pyro and clutch tomorrow. What is a good clutch that aint gonna kill the pocketbook?

wyoranch's Sig:The fun one: '06 3500 QC 4x4 Short Bed. AFE Cold Air Intake, Mbrp 5" exhaust. Billet tranny, Smarty, Boost & Pyro

The daily driver: 88 Ford ranger extended cab 4x4 xlt. Fm146 conversion. Kubota v2203, ihi rhf4 Turbo. Custom intercooler, custom everything.
Old 12-23-2007, 01:07 PM
stillbad's Avatar
Diesel Fan


I would just go ahead and get a south bend that way you wont have to worry.

stillbad's Sig:1994 Dodge 3500, straight axle, 5x12's, laser cut dv's, 4k GSK, 60lb valve springs, #0 fuel plate, head work, studded and ringed, custom cold air intake, Scheid diesel s300 turbo kit, timing set at 18.5-19*,12 button #3600 south bend double disk, big input shaft, 1 piece hd driveshaft, 6" bullhauler, boost and pyro, 361 hp 1077ft.lbs. with busted tranny, boost leak an stock timing
Old 12-23-2007, 01:34 PM
Whit's Avatar
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Originally Posted by stillbad View Post
I would just go ahead and get a south bend that way you wont have to worry.

I second that

Whit's Sig:"Enjoy the day. Take what you want and leave the rest...."
Old 12-23-2007, 01:35 PM

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The steps for turning up a P7100 pump are:
1) Remove your AFC Housing
2) Mod Your Fuel Plate either slide it forward or purchase a cut one
3) Adjust the governor lever to contact the fuel plate
4) Crank the star Wheel Towards the motor
5) Slide The AFC housing all the way forward
Details Below......

Click the image to open in full size. First of all Know Your Pump
Only 1994-1998 trucks have the P7100 Pump
The Control Parts List number or CPL number is located on the engine data plate, which can be found on the drivers side of the timing gear cover. The engine data plate includes such information as the CPL number, engine serial number, and pump timing information.
Engine Model



195 HP
1549, 1550
1551, 1552
1553, 1815
1816, 1959
1839, 1968
AFC Removal

Click the image to open in full size. If you do almost any pump work you have to take the AFC housing off.
Remove front passenger side AFC housing break off screw. NOTE: This screw is a factory break off screw with rounded head and no screw driver, allen head or TORX slot. Use a hand impact tool with a 6 inch long 1/4" extension and a T15 TORX bit to remove this screw. A center punch may be required to start a hole in the center of this screw. Set the hand impact tool in the removal position (counter clockwise) and use light hammer taps on the impact tool to loosen this screw. Tap progressively harder on the impact tool until the screw loosens. This method of removal forms a TORX shape into the screw allowing it to be reinstalled later with the T15 TORX bit. In some cases the hole in the top of this screw is too large for the T15 bit thus use the T20 TORX bit. There is usually a lock washer and flat washer under each of these screws. OPTIONAL: A sharp chisel can be used to remove the break off screw by making a notch in the outside diameter of the head, then applying a tangential force with light blows to the chisel counterclockwise to remove the screw.

Click the image to open in full size. AFC Cut Away

Click the image to open in full size. Fuel Plate

Click the image to open in full size. With the AFC housing removed you can now see the fuel plate .
Sliding the stock plate will increase HP quite a bit. However, the stock plate profile is not designed for that so the result is usually EGT problems. Home ground plates are not a good idea either. Pump experts say to NEVER remove the plate completely. There is a pin in the pump that will eventually wear and break causeing very expensive damage. Slide the plate ATW Foward and if you still want more contact TST for a Cut Plate , they will recommend one for your truck

Click the image to open in full size. This is what it looks like under the fuel plate
Governor Lever Adjustment

Click the image to open in full size. This is a cut away view of the governor of a P7100 pump. Notice how the lever hit the cam plate flush at the very bottom edge. To check your adjustment the throttle lever needs to be moved until the lever just touches the cam plate. With the AFC housing removed, look down through the opening behind the cam plate and see where the lever is striking the plate. This should be done with the Fuel Shutoff Solenoid in the run ( or pulled up ) position.
Where the lever strikes the cam plate will vary depending on the style and design of the cam plate you are using. For plates similar to the stock plate, like shown below, this lever is set correctly. It is adjusted so the lever is flush with the bottom edge of the plate, and does not ride under the plate.
(Picture Courtesy of BD Power)

Click the image to open in full size. For cam plates, like a TST #6 for example, that have a taper at the very bottom of the plate, adjust the lever so the lever hits at the tip of the bottom nose on the plate. It is OK to be slightly below that. However too far down causes the lever to be held back as the RPM's rise. This causes the loss in bottom end power, with the sudden surge as the lever finally clears the nose and hits the main fueling curve.
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Old 12-23-2007, 01:36 PM

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Click the image to open in full size.

This is what the pump looks like from the back with the cover removed. Do not change the adjustment in the upper right hand corner. The adjustment in the lower left hand corner is the one to make. Loosen the locknut ( 10mm socket required ). Making very small adjustments to the screw, adjust the lever the proper height. Now tighten the locknut.
One thing to realize about the plate is that it is properly called a full load throttle stop. What this means is that if you are not running at WOT or close to it the plate is not doing anything. It's just taking up space in the pump.
Star Wheel Adjustment

Click the image to open in full size. To adjust, remove the large plug on top of the AFC housing using an 8 mm allen wrench. Take care not to loose the sealing washer under the plug. Removing the plug exposes a star wheel which changes the quickness of fueling response to boost. If acceleration is weak with minimal smoke, rotate top of the star wheel toward the engine a few revolutions. If vehicle has heavy black smoke on initial acceleration, rotate top of star wheel away from engine a few revolutions. Reinstall large plug with sealing washer and test drive vehicle again. It may take repeated attempts to get this adjustment set. If heavy smoke is still encountered with star wheel moved completely to rear position, loosen AFC housing and slide it rearward a 1/16 inch, retighten and test again. Repeat unit desired results occur.

Click the image to open in full size.
Click the image to open in full size.
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Old 12-23-2007, 03:55 PM
stillbad's Avatar
Diesel Fan


Great detailed explanation with pics DieselMinded.
Old 12-23-2007, 09:31 PM
wyoranch's Avatar
Diesel Wrench



thanks a lot guys, everything i wanted to know.
Old 12-25-2007, 12:35 AM
Diesel Fan


deff gonna wanna buy a nice south bend clutch so your friend doesn't have to buy two clutches. grind a 0 plate and buy whatever the next step up from a con o is. and i would recommend buying isspro gauges a 0-60psi boost and pyrometer if possible get both of them from vulcan performance for 216 with a pillar. pretty damn cheap, i shopped around

9712valve's Sig:97 dodge 4wd rc lb:,kdp tabbed,0 plate ff,afc housing fully tuned,4kgsk, 15.5* boost elbow 6" side pipe, arp 12mm head studs, full suncoast tranny, Ii 5x.016 dragon flows. ddp delivery valves waiting to go in.

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Posted By For Type Date
Cummins Engine Serial Number 12 Valve - Kosmix : Reference, Videos, Images, News, Shopping and more... This thread Refback 08-01-2010 11:28 AM
How To Turn Up A 12 Valve Cummins|bloglines Answers This thread Refback 05-17-2010 05:23 PM
How To Turn Up Fuel On 12 Valve - Kosmix : Reference, Videos, Images, News, Shopping and more... This thread Refback 04-16-2010 03:38 PM
Sliding the stock plate forward and governor adjustment - Competition Diesel.Com - Bringing The BEST Together This thread Refback 09-29-2009 08:12 PM

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