Runaway, what is it, how do I stop it?!

[Cowboy_Customs]

Welcome to Cummins Forum, odds are if your reading this your new to the 1st gen Cummins. I am going to explain what runaway is, what causes it, and how u stop it!
What is a runaway?
A runaway can occur while turning up the fuel on the VE injection pump, the reason they run away is that the control collar can't move far enough towards the "defuel" end of the plunger (making the spill port area smaller), and the backpressure in the spill port becomes high enough that engine speed goes out of control. This is why they will idle OK but then hang at high RPM. At low RPM there's not enough backpressure to start the runaway.

How do u prevent a runaway?
Simple, turn the fuel screw in with the engine running using a special procedure. With every 1/2 turn of the fuel screw, snap the throttle. IF the throttle hangs in the upper RPM's before coming back down your on the edge of runaway, or if it will not comeback down to its prior RPM, back your fuel screw back out at least 1/2 turn.
How do u stop a runaway?
Remove an intake somewhere on the engine, if your doing this by yourself, open the intake on the driver side of the engine, if 2 people, remove the intake at the turbo and give your sidekick the board to cover the inlet into the turbo. What your doing is choking the engine should the runaway occur. This will the engine down.
You need to keep a sturdy board handy while your turning up the power, after all u dont want plywood sucked into your motor at 6000 RPM's do ya?

This is runaway, and thats how u can try to prevent it, and stop it. Still want to turn uo the power??

__________________
'95 3500 SLT Laramie clubcab 4x4 bolt action flatbed Pacbrake 60# springs timed and tuned 4.10LS 19.5's and 309K on the clock!
http://community.webshots.com/user/Cowboy_Customs

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Last edited by Cowboy_Customs : 07-07-2007 at 12:11 PM.

[Diesel Dummy]

I do, i do, where is is my fuel screw!!!!!!

[chuckect]

I am a dummy too. the previous owner told me that the power was turned up slightly and that 40+ injectors were installed, so i'm fine for power and fuel. My question (if I may ask it here) is what do I heat up when I turn the key on and wait for the light to go out and how hot does it get and does it have a limit switch of some sort.

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92 RAM 250, 234.000 - rebuilt 3.54 rear-end, rebuilt auto trans. 40 HP injectors, K&N, just added a bully dog fuel pin (8/28/08)

[Diesel Nut]

Heater Grid. Right where the intake horn comes out of the intercooler and goes into the motor is a grid that gets hot when electricity is applied to it. This warms the air entering a cold engine so that the air, when compressed, will be warm enough to support combustion.

"Other" diesels perform this task with glow plugs.

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[Cowboy_Customs]

Originally Posted by Diesel Dummy

I do, i do, where is is my fuel screw!!!!!!

Yer fuel screw is located on either side of yer upper torso, what ya gotta do is find a product u like that adds more power, look at the price tag, then find someone to grab ahold of a limb onb yer upper torso, and then pull it behind yer back, and twist till u cant take it anymore, forceing yerself to spend hundreds of dollars on computer boxes! :

__________________
'95 3500 SLT Laramie clubcab 4x4 bolt action flatbed Pacbrake 60# springs timed and tuned 4.10LS 19.5's and 309K on the clock!
http://community.webshots.com/user/Cowboy_Customs