1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

Star Wheel and Full Power Adjustment

Thread Tools
 
Search this Thread
 
  #1  
Old 12-04-2010 | 01:06 PM
901stgen's Avatar
Thread Starter
|
Diesel Enthusiast
Joined: Oct 2010
Posts: 360
Likes: 34
From: Kempton, Indiana
Default Star Wheel and Full Power Adjustment

Is it safe to turn the star wheel and full power screw with everything stock except for gov spring? If so how much can i go? Thanks for any info.
 
  #2  
Old 12-04-2010 | 03:01 PM
mtk454ss's Avatar
Diesel Fan
Joined: Sep 2010
Posts: 14
Likes: 1
From: Salem, Ohio
Default

Yes! full power/ full load screw is where most of your power comes from! I turned the starwheel all the way down removed the nylon washer, rotated fuel pin to the deepest setting and screwed in the full load screw (back of pump) in like 3.5 turns on a bone stock truck and it made a world of difference!! You'll really see a big difference in top end power with the load screw turned in, in my opinion. all the other mods really seemed make around town driving more enjoyable! Hope this helps
 
The following users liked this post:
Billy D (12-04-2010)
  #3  
Old 12-04-2010 | 07:01 PM
JBradley500's Avatar
Diesel Enthusiast
Joined: Apr 2010
Posts: 220
Likes: 13
Default

be careful with the full power screw. go in 1/2 turn increments (with the truck running) and rev the engine after each increment. If the RPM's dont come back down like normal then you need to stop and turn the screw back out 1/2 turn. if you go too far the engine can rev out of control.
 
  #4  
Old 12-07-2010 | 07:08 PM
90cummins's Avatar
Diesel Fan
Joined: Dec 2010
Posts: 98
Likes: 5
From: Indiana
Default

does removing the nylon washer do anything? i thought it could only go down so far?
 
  #5  
Old 12-07-2010 | 07:49 PM
blazier18's Avatar
Diesel Bomber
Joined: Jul 2010
Posts: 1,176
Likes: 28
From: knox county tn
Default

where is that at the washer
 
  #6  
Old 12-07-2010 | 07:59 PM
90cummins's Avatar
Diesel Fan
Joined: Dec 2010
Posts: 98
Likes: 5
From: Indiana
Default

in the afc on the fuel pin
 
  #7  
Old 12-07-2010 | 08:13 PM
cummins smokin's Avatar
Diesel Enthusiast
Joined: Jul 2010
Posts: 101
Likes: 3
Default

yes, i thought it helped quite a bit at full throttle!! It lets the pin travel a little further then it normally does.
 
  #8  
Old 12-07-2010 | 08:13 PM
kieron_kohlmann's Avatar
Diesel Enthusiast
Joined: Feb 2010
Posts: 352
Likes: 31
From: Wisconsin
Default

Im having a hard time turning my star wheel. the pump was just rebuilt and since then it wont turn. I tried tapping on it with a screw driver but that makes me nervous. any ideas?
 
  #9  
Old 12-07-2010 | 08:19 PM
90cummins's Avatar
Diesel Fan
Joined: Dec 2010
Posts: 98
Likes: 5
From: Indiana
Default

Originally Posted by cummins smokin
yes, i thought it helped quite a bit at full throttle!! It lets the pin travel a little further then it normally does.
do you have any other upgrades other than on the pump, if not that is exactly what i gave done and i might do that also. thanks
 
  #10  
Old 12-08-2010 | 04:17 AM
RSWORDS's Avatar
BOMBARDIER

Joined: Mar 2007
Posts: 11,159
Likes: 918
From: Gloucester, VA
Default

Originally Posted by mtk454ss
Yes! full power/ full load screw is where most of your power comes from! I turned the starwheel all the way down removed the nylon washer, rotated fuel pin to the deepest setting and screwed in the full load screw (back of pump) in like 3.5 turns on a bone stock truck and it made a world of difference!! You'll really see a big difference in top end power with the load screw turned in, in my opinion. all the other mods really seemed make around town driving more enjoyable! Hope this helps
Um, safe on a stock truck to just start turning screws, no.

Originally Posted by JBradley500
be careful with the full power screw. go in 1/2 turn increments (with the truck running) and rev the engine after each increment. If the RPM's dont come back down like normal then you need to stop and turn the screw back out 1/2 turn. if you go too far the engine can rev out of control.
Thsi is better, need to watch for run away, other wise you will be very upset with a conecting rod hanging out your block. Take the inlet off the turbo and get a 2x6. Have a friend stand next to the pasenger side of the truck. after you turn teh full power screw 1/2 turn snap the throttle, if the RPM's hang or come down slower then usual turn it back half a turn. If the RPM's cointinue to climb after you release the throtte quickly put the 2x6 over the turbo inlet. Watch your fingers it WILL suck them and and WILL cut them off. If you hit a true run away this is the ONLY way to cut the engine off. Turning off the key will do nothing.
 
The following users liked this post:
big bad diesel 416 (12-12-2010)



All times are GMT -5. The time now is 06:14 PM.