B7100 rebuilt motor runaway engine

[Sdatrucking]

Newly rebuilt ran great started up yesterday ran about 15 min then motor started revving on its own revving way too high killed it let sit for a while then restarted moved it back to its park spot maybe a minutes drive and it was doing it again I’m guessing inj pump messing up in Arkansas freezing cold

 

[chris142]

Mine did that when the dealer way overfilled the engine oil. How is your oil level?

 

[North Idaho Wolfman]

Have you been into the Injection pump?
How much of the engine did you get into?
Do you have any throttle control of the engine?
Any smoke when it does this?
Is the fuel new?

 

[Sdatrucking]

Mine did that when the dealer way overfilled the engine oil. How is your oil level?

On the money not even 5 hours since rebuild

 

[Sdatrucking]

New pistons rings bearings didn’t touch inj pump throttle operates normal till runaway fresh fuel and all filters just slight smoke as expected till rings get seated

 

[hagrid]

Newly rebuilt ran great started up yesterday ran about 15 min then motor started revving on its own revving way too high killed it let sit for a while then restarted moved it back to its park spot maybe a minutes drive and it was doing it again I’m guessing inj pump messing up in Arkansas freezing cold

By what method are you 'killing' the engine when it runs away?

 

[Sdatrucking]

Kill lever below throttle

 

[North Idaho Wolfman]

Ok, color me real confused as the B7100 does not have a stop lever on the side????

Is the motor out of something else?

 

[Sdatrucking]

Small yellow lever is stop lever on my 7100 throttle lever won’t kill it

 

[Lil Foot]

Ok, color me real confused as the B7100 does not have a stop lever on the side????

Is the motor out of something else?

Mine has that one in that location.
Exactly.

 

[Lil Foot]

Like so....

 

[JRHill]

Small yellow lever is stop lever on my 7100 throttle lever won’t kill it....
----
Kill lever below throttle

When I hear 'run away' or 'over revving' I think of over the full throttle setting and NOTHING stops it.

The B7100 kill 'lever' and the throttle act on the same shaft to the injection pump. If you can shut down with the kill lever under the dash then I think your linkage is screwed up somehow or your snow shoes are pushing on the foot throttle (wink). If you can shut the engine down with the throttle lever you have a whole different problem.*** There is adjustment on that linkage.

I can only wish for a freshened engine in my B7100. But at my age the machine's power and the hydraulics are just self adjusting to my capabilities and have declined over time. It's perfect for me.

*** Do you have a B7100 service manual? I have no ideas what's under the injector lever's top cover with the four screws. There have to be two springs that return the engine to a low idle position. One springs the lever home from High to Low idle and the other from Shut down to Low Idle.

 

[JRHill]

Question to those knowledgeable in the B7100 fuel injector: Is there a governor involved for high speed? I'm guessing not but it's never come up. I've wondered though.

 

[North Idaho Wolfman]

Like so.... View attachment 168890

Interesting, all of mine have shut off with the throttle.

 

[D2Cat]

If you have a runaway engine you'd have to completely block off the air supply to get it shut down. Then depending on the size of the engine that may be a problem, but with your engine a real heavy doubled over winter coat may smother it.

 

[North Idaho Wolfman]

Question to those knowledgeable in the B7100 fuel injector: Is there a governor involved for high speed? I'm guessing not but it's never come up. I've wondered though.

Yes there is a governor.
Yes he could be having a spring issue?

 

[Vincecj]

Like so.... View attachment 168890

Nothing to do with the subject being discussed, but I like your "handbrake" set up.

 

[Lil Foot]

Nothing to do with the subject being discussed, but I like your "handbrake" set up.

B7100 Parking Brake Mod

As anyone who owns one knows, the parking brake on the B7100 leaves much to be desired. It consists of a 5/16" rod that lays on the floorboard- push down the brake pedal, lift the rod, release the pedal, & the teeth at the end of the rod hold the brake pedal in the down position. Works OK, but...

www.orangetractortalks.com

 

[JRHill]

Nothing to do with the subject being discussed, but I like your "handbrake" set up.

Definitely. I've just been bending way over to the right for 35 years.