B7100 non running project

skind

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Equipment
B6000, B7100, BX23S
Nov 9, 2024
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I recently purchased a B7100 hst 4wd with 1500 hrs, I believe an 82 model. Anyways, I bought it non running. I am only getting fuel out of the front line on the injector pump. Yes, I did bleed the system. The back two are dry, the back one actually has some corrosion.
So, I seen a couple videos and it doesn't look to difficult to take this pump apart and clean and inspect everything. But before I do, anybody have any tips or a detailed diagram of the insides to help guide me?
I appreciate the help!
 

North Idaho Wolfman

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Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
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Sandpoint, ID
If you do it right and not swap parts and actually put it back together the exact right way with it timed, then yes it's possible.

Being able to do much of anything to get it working again if there is corrosion in it, Highly unlikely.
Post up some pictures of what you find inside.
 

skind

New member

Equipment
B6000, B7100, BX23S
Nov 9, 2024
4
0
1
US
If you do it right and not swap parts and actually put it back together the exact right way with it timed, then yes it's possible.

Being able to do much of anything to get it working again if there is corrosion in it, Highly unlikely.
Post up some pictures of what you find inside.
Thanks for the reply!
I took it apart. Only problem I had on taking it apart was the two screws holding the plate on the side. They were punched on the side to keep them from backing out. Finally got them free without stripping them. Anyways, the inside had no corrosion, fairly clean, just a little black residual here and there.
Before taking it apart, I noticed the slide would move, but not freely and the front lobe was more stiff moving than the other two. Taking it apart the locating pin for the front injector line behind the cover had the pin broke off and jammed and the piece that it was supposed to locate was turned some.
So, my uneducated guess is the turned piece was allowing constant fuel to the front cylinder and the stiff slide was from the broken pin and the damaged bottom landing dragging on the control sleeve.
The whole inside of the pump was wet with fuel so do you think the reason the back two were dry is because of the front one taking all the fuel with the turned "fuel inlet sleeve"(not sure what to call it). I did notice the oil smells like fuel and is thin and over full, maybe from too much fuel dumping in the front cylinder?
Also, on the damaged pump housing, I think it'd be ok, because it seals the fuel on the top not the bottom? Is that right?
I'll try to attach some pictures of the broken locating pin, the damage housing, and all the parts out. These are before I cleaned anything.
20241109_213934.jpg
20241109_213952.jpg
20241109_214031.jpg

Thanks!
 

North Idaho Wolfman

Moderator
Staff member
Lifetime Member

Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
30,038
6,207
113
Sandpoint, ID
Yea those collars ( the pin that is broken is a collar) are to adjust the timing curve on the individual injector pump ports to match the third un-adjustable pump port.
This is not an adjustment that can be done without the proper test equipment.
You can replace the collar and you'll be able to get it to work but without the proper rebuild it will be OK at best.
 

skind

New member

Equipment
B6000, B7100, BX23S
Nov 9, 2024
4
0
1
US
Yea those collars ( the pin that is broken is a collar) are to adjust the timing curve on the individual injector pump ports to match the third un-adjustable pump port.
This is not an adjustment that can be done without the proper test equipment.
You can replace the collar and you'll be able to get it to work but without the proper rebuild it will be OK at best.
That's a bummer...

Is there a place that sells these collars, or is the Kubota dealer the only one?