Easiest Way to turn the power screw??

blown91smoke · 09-13-2009, 02:14 PM

What is the easiest way to get to the power screw? I have tried from every angle. Maybe my hands are too big or something but I cant even see it, Someone who has done it. How was it done? Thanks

__________________

1991 2wd non i/c 5sp

OHIOCOALROLLERS

dieselcrazyw350 · 09-13-2009, 06:11 PM

use a 13mm to lossen it and then use a 6mm to turn it

__________________
91.5 W350 Getrag G360<__>92 D250 club cab automatic
http://www.youtube.com/watch?v=oUGlaemOCG4

***Orangeracer*** · 09-13-2009, 10:40 PM

Quote:

Originally Posted by dieselcrazyw350

use a 13mm to lossen it and then use a 6mm to turn it

good advice. Use a 6 point wrench so you dont strip

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93 d350, 92 d250, 81 cc, LOTS OF MONEY
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slow_90firebird · 09-14-2009, 02:07 AM

your talking about the full power screw on the backside, right? I wanna try turning that just a bit and see what it does.

I was looking at it the other day, but there was no way I could get any screwdriver in there. Never thought about using a wrench - one of the techs at work has a set of those tiny micro-wrenches. Maybe I will borrow one of those and try, they say you can get like 1/2 turn sometimes before the tab stops you, right? I really dont feel safe backing the thing all the way out to cut the tab.

I already tried turning the smoke screw up a little. I gave it about 1.5 full turn and didnt get any increase in power or smoke lol. So i gave up on that one.

I would try the fuel pin and the starwheel, but I am afraid to crack into the wet part of the pump. I dont think the little thumb depressor on my lift pump works so if I loose fuel I might dig myself into a hole...

__________________
1993 W250 club cab, 518auto, 220k nearly stock

DieselSharker · 09-14-2009, 02:17 AM

Quote:

Originally Posted by slow_90firebird

your talking about the full power screw on the backside, right? I wanna try turning that just a bit and see what it does.

I was looking at it the other day, but there was no way I could get any screwdriver in there. Never thought about using a wrench - one of the techs at work has a set of those tiny micro-wrenches. Maybe I will borrow one of those and try, they say you can get like 1/2 turn sometimes before the tab stops you, right? I really dont feel safe backing the thing all the way out to cut the tab.

I already tried turning the smoke screw up a little. I gave it about 1.5 full turn and didnt get any increase in power or smoke lol. So i gave up on that one.

I would try the fuel pin and the starwheel, but I am afraid to crack into the wet part of the pump. I dont think the little thumb depressor on my lift pump works so if I loose fuel I might dig myself into a hole...

When you take the AFC cover off you shouldn't even see any fuel. That's not the wet part of the pump. Just be careful you don't strip the cover screws because if it hasn't been touched at all they will be tight. Might need an impact screwdriver socket and a rachet.

As far as the smoke screw goes, you need to go 2 or 3 turns to see any more smoke and if you're looking for more power you're wasting your time on the smoke screw. Mine is bottomed out to the top of the jambnut but I pan on bringing it back a turn or 2 when I get home til I get my stack.

__________________

hris--1991 W250, 727 & Gear Vendor, Bully Dog sticks, DennyT II pin, 3200rpm spring, BHAF, Pump bombed, 4"-8" Mitre, Isspro boost/pyro on "custom dash mount", 4.88:1, 37x12.5 Cepeks on 3rd gens. 1st gen Pics

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DieselSharker · 09-14-2009, 02:23 AM

Oh yeah, as far as the fuelpower screw goes, I gave up after awhile because it was way hot outside, I was dehydrated, and I couldn't turn the jambnut on the idle screw so I could turn it down. Even with a hammer and punch. I took a small screwdriver and bent the tip to reach the power screw and it seemed to work ok. It's a bit of a pain to not keep hitting the shutoff solenoid with your wrench when you're trying to turn the locknut, shutting the truck off. It's a pain when you have a lifted truck and you're a fat boy like me and have to keep climbing up and down on and off the bumper to turn the truck back on. All I'm gonna say is have a helper present lol. But like I said...that idle screw is a PITA and you need to be able to turn it down. Maybe try turning it first so if you can't get it you don't have to turn the fuel screw back down like I had to.

__________________

hris--1991 W250, 727 & Gear Vendor, Bully Dog sticks, DennyT II pin, 3200rpm spring, BHAF, Pump bombed, 4"-8" Mitre, Isspro boost/pyro on "custom dash mount", 4.88:1, 37x12.5 Cepeks on 3rd gens. 1st gen Pics

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wheelerfreak · 09-14-2009, 09:53 AM

I didn't leave my truck running when I adjusted the full power screw

I took a pair of needle nose vise-grips and just twisted the collar off, came off real easy. Then adjusted the power screw using a ratcheting box end wrench to break the lock nut loose and then a 1/4" drive socket on a u-joint to turn the screw in 1.5 turns.

I did find adjusting the idle to be the real pain though, that made adjusting the power screw seem easy.

__________________
1993 W250 LE Club Cab Long Bed.

DieselSharker · 09-14-2009, 10:30 AM

I left it running so I could bump the throttle every 1/4 turn so I don't hit runaway driving down the highway. That's just me though.

__________________

hris--1991 W250, 727 & Gear Vendor, Bully Dog sticks, DennyT II pin, 3200rpm spring, BHAF, Pump bombed, 4"-8" Mitre, Isspro boost/pyro on "custom dash mount", 4.88:1, 37x12.5 Cepeks on 3rd gens. 1st gen Pics

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blown91smoke · 09-14-2009, 06:12 PM

Okay, does someone have a picture of the idle screw because im not sure which on that is. I get the jamnut loosened and then I turn the powerscrew in right? Then im going to want to lower the idle a bit because the power screw raises the idle correct??? Thanks alot!

__________________

1991 2wd non i/c 5sp

OHIOCOALROLLERS

dieselcrazyw350 · 09-15-2009, 02:23 AM

Quote:

Originally Posted by blown91smoke

I get the jamnut loosened and then I turn the powerscrew in right? Then im going to want to lower the idle a bit because the power screw raises the idle correct??? Thanks alot!

correct, the more you turn the screw in the more you have to lower your idle. on mine i was having a hell of a time adjusting my idle screw so i went and broke off the metal tab that rests on the idle screw

...so now all i have to do is adjust my throttle linkage.

__________________
91.5 W350 Getrag G360<__>92 D250 club cab automatic
http://www.youtube.com/watch?v=oUGlaemOCG4

blown91smoke · 09-15-2009, 02:53 PM

Wait, is there an actual idel screw or are they one in the same??? (idle/power screw)

__________________

1991 2wd non i/c 5sp

OHIOCOALROLLERS

DieselSharker · 09-15-2009, 03:14 PM

Wow. Yes there is a separate screw. You WILL need to turn it down. I also recommend adjusting the screw with the motor running and bumping the throttle every 1/4 turn or so and make sure you don't hear the rpms hanging as this means you may be in danger of runaway which is bad...very bad. Non-I/C trucks tend to hit runaway sooner than IC trucks for some reason. I only turned mine one turn before the throttle started hanging. Read this whole thread and pay close attention.
Governor Spring/VE Info Threads Merged.. - TDR Roundtable

Don't start messing with the fuel screw and the internals until you are very familiar with the pump and have done research.

Good luck and have fun with it but be safe about it.

__________________

hris--1991 W250, 727 & Gear Vendor, Bully Dog sticks, DennyT II pin, 3200rpm spring, BHAF, Pump bombed, 4"-8" Mitre, Isspro boost/pyro on "custom dash mount", 4.88:1, 37x12.5 Cepeks on 3rd gens. 1st gen Pics

SUPPORT YOUR VETERANS!

09-13-2009, 02:14 PM	#1 (permalink)
blown91smoke Cummins Fanatic Join Date: Jun 2009 Location: Columbus, OH-IO Posts: 180 Thanks: 1 Thanked 2 Times in 2 Posts blown91smoke's Truck Pics	Easiest Way to turn the power screw?? What is the easiest way to get to the power screw? I have tried from every angle. Maybe my hands are too big or something but I cant even see it, Someone who has done it. How was it done? Thanks __________________ 1991 2wd non i/c 5sp OHIOCOALROLLERS

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09-13-2009, 06:11 PM	#2 (permalink)
dieselcrazyw350 Cummins Enthusiast Join Date: Jun 2009 Location: sacramento, california Posts: 244 Thanks: 0 Thanked 9 Times in 9 Posts dieselcrazyw350's Truck Pics	use a 13mm to lossen it and then use a 6mm to turn it __________________ 91.5 W350 Getrag G360<__>92 D250 club cab automatic http://www.youtube.com/watch?v=oUGlaemOCG4

09-14-2009, 02:07 AM	#4 (permalink)
slow_90firebird Cummins Fan Join Date: Apr 2008 Posts: 46 Thanks: 1 Thanked 0 Times in 0 Posts slow_90firebird's Truck Pics	your talking about the full power screw on the backside, right? I wanna try turning that just a bit and see what it does. I was looking at it the other day, but there was no way I could get any screwdriver in there. Never thought about using a wrench - one of the techs at work has a set of those tiny micro-wrenches. Maybe I will borrow one of those and try, they say you can get like 1/2 turn sometimes before the tab stops you, right? I really dont feel safe backing the thing all the way out to cut the tab. I already tried turning the smoke screw up a little. I gave it about 1.5 full turn and didnt get any increase in power or smoke lol. So i gave up on that one. I would try the fuel pin and the starwheel, but I am afraid to crack into the wet part of the pump. I dont think the little thumb depressor on my lift pump works so if I loose fuel I might dig myself into a hole... __________________ 1993 W250 club cab, 518auto, 220k nearly stock

09-14-2009, 02:23 AM	#6 (permalink)
DieselSharker Diesel Freak Join Date: May 2007 Location: Killeen, soon to be Houston, TX Posts: 867 Thanks: 64 Thanked 59 Times in 33 Posts DieselSharker's Truck Pics	Oh yeah, as far as the fuelpower screw goes, I gave up after awhile because it was way hot outside, I was dehydrated, and I couldn't turn the jambnut on the idle screw so I could turn it down. Even with a hammer and punch. I took a small screwdriver and bent the tip to reach the power screw and it seemed to work ok. It's a bit of a pain to not keep hitting the shutoff solenoid with your wrench when you're trying to turn the locknut, shutting the truck off. It's a pain when you have a lifted truck and you're a fat boy like me and have to keep climbing up and down on and off the bumper to turn the truck back on. All I'm gonna say is have a helper present lol. But like I said...that idle screw is a PITA and you need to be able to turn it down. Maybe try turning it first so if you can't get it you don't have to turn the fuel screw back down like I had to. __________________ hris--1991 W250, 727 & Gear Vendor, Bully Dog sticks, DennyT II pin, 3200rpm spring, BHAF, Pump bombed, 4"-8" Mitre, Isspro boost/pyro on "custom dash mount", 4.88:1, 37x12.5 Cepeks on 3rd gens. 1st gen Pics SUPPORT YOUR VETERANS!

09-14-2009, 09:53 AM	#7 (permalink)
wheelerfreak Newbie Join Date: May 2009 Posts: 15 Thanks: 0 Thanked 0 Times in 0 Posts wheelerfreak's Truck Pics	I didn't leave my truck running when I adjusted the full power screw I took a pair of needle nose vise-grips and just twisted the collar off, came off real easy. Then adjusted the power screw using a ratcheting box end wrench to break the lock nut loose and then a 1/4" drive socket on a u-joint to turn the screw in 1.5 turns. I did find adjusting the idle to be the real pain though, that made adjusting the power screw seem easy. __________________ 1993 W250 LE Club Cab Long Bed.

09-14-2009, 10:30 AM	#8 (permalink)
DieselSharker Diesel Freak Join Date: May 2007 Location: Killeen, soon to be Houston, TX Posts: 867 Thanks: 64 Thanked 59 Times in 33 Posts DieselSharker's Truck Pics	I left it running so I could bump the throttle every 1/4 turn so I don't hit runaway driving down the highway. That's just me though. __________________ hris--1991 W250, 727 & Gear Vendor, Bully Dog sticks, DennyT II pin, 3200rpm spring, BHAF, Pump bombed, 4"-8" Mitre, Isspro boost/pyro on "custom dash mount", 4.88:1, 37x12.5 Cepeks on 3rd gens. 1st gen Pics SUPPORT YOUR VETERANS!

09-14-2009, 06:12 PM	#9 (permalink)
blown91smoke Cummins Fanatic Join Date: Jun 2009 Location: Columbus, OH-IO Posts: 180 Thanks: 1 Thanked 2 Times in 2 Posts blown91smoke's Truck Pics	Okay, does someone have a picture of the idle screw because im not sure which on that is. I get the jamnut loosened and then I turn the powerscrew in right? Then im going to want to lower the idle a bit because the power screw raises the idle correct??? Thanks alot! __________________ 1991 2wd non i/c 5sp OHIOCOALROLLERS

09-15-2009, 02:53 PM	#11 (permalink)
blown91smoke Cummins Fanatic Join Date: Jun 2009 Location: Columbus, OH-IO Posts: 180 Thanks: 1 Thanked 2 Times in 2 Posts blown91smoke's Truck Pics	Wait, is there an actual idel screw or are they one in the same??? (idle/power screw) __________________ 1991 2wd non i/c 5sp OHIOCOALROLLERS

09-15-2009, 03:14 PM	#12 (permalink)
DieselSharker Diesel Freak Join Date: May 2007 Location: Killeen, soon to be Houston, TX Posts: 867 Thanks: 64 Thanked 59 Times in 33 Posts DieselSharker's Truck Pics	Wow. Yes there is a separate screw. You WILL need to turn it down. I also recommend adjusting the screw with the motor running and bumping the throttle every 1/4 turn or so and make sure you don't hear the rpms hanging as this means you may be in danger of runaway which is bad...very bad. Non-I/C trucks tend to hit runaway sooner than IC trucks for some reason. I only turned mine one turn before the throttle started hanging. Read this whole thread and pay close attention. Governor Spring/VE Info Threads Merged.. - TDR Roundtable Don't start messing with the fuel screw and the internals until you are very familiar with the pump and have done research. Good luck and have fun with it but be safe about it. __________________ hris--1991 W250, 727 & Gear Vendor, Bully Dog sticks, DennyT II pin, 3200rpm spring, BHAF, Pump bombed, 4"-8" Mitre, Isspro boost/pyro on "custom dash mount", 4.88:1, 37x12.5 Cepeks on 3rd gens. 1st gen Pics SUPPORT YOUR VETERANS!