Turning up your P-7100 IP - Diesel Bombers



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

 
 
 
 
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Old 03-19-2009, 10:23 AM
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Default Turning up your P-7100 IP

Article by our very own Dieselminded.........Chad

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......

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

160hp

180hp

215hp
(California)
195 HP
CPL
Numbers
1549, 1550
1551, 1552
1553, 1815
1816, 1959
1839, 1968
2022
2174
2023
2175
1863
AFC Removal


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.

AFC Cut Away

Fuel Plate


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

This is what it looks like under the fuel plate
Governor Lever Adjustment


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)

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.
The Following 2 Users Say Thank You to Whit For This Useful Post:
392hemix (03-21-2009), 94cummins12v (03-19-2009)
  #2  
Old 03-19-2009, 10:37 AM
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sweet deal there whit
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Old 03-19-2009, 11:36 AM
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you can also chop your own plate at home, its really easy if you have a small dremel with a grinding tip, took me about 20 minutes and now my 12 valve dumps smoke in overdrive
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Old 03-21-2009, 10:07 AM
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Very nicely displayed I LIKE
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Old 03-21-2009, 12:10 PM
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Sticky??
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Old 03-22-2009, 02:08 AM
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same thing at this link but in its original format that is a little less confusing to follow

CumminsDatabase.com :: Turning Up A P7100 Pump
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Old 03-22-2009, 07:49 AM
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Quote:
Originally Posted by ykdave View Post
same thing at this link but in its original format that is a little less confusing to follow

thats because Dieselminded wrote that one too
  #8  
Old 03-22-2009, 08:56 AM
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Yeppers i Put it on Dodge Diesel Database Back in the day , Im the one who took the photos of the P-Pump Cut Away too , them photos have made it everywhere
  #9  
Old 03-22-2009, 11:12 AM
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tangential

Also known as the biggest word Chad has EVER used......














good article......
 
 
 

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