Kubota D1105 exhaust out of injector inlet!

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Mike.R.B

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Aug 17, 2020
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After a full rebuild the engine would start then cut out, and air would be in the fuel rail. Lots more cranking and the same would happen. I took off the diesel rail pipes and cranked the engine and bubbles were coming out of the injector inlet, obviously feeding "air" back into the rail.

I even swapped the injector pump from another engine, but same problem.

I assumed bad injectors from sitting around while engine work was being done.

Bought and installed new injectors but same thing happening, but one is particularly bad, with puffs of exhaust.

What's going on here?
 
L

lugbolt

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ZG127S-54
Oct 15, 2015
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well there ain't but a couple ways for air to get into the injector lines. Through the pump (sucking air at the pump inlet?) or through the injector. Unless there is a problem with the bleed lines which I've never heard of.

Just thinking out loud, FWIW.
 
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Russell King

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Jun 17, 2012
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What brand are the new injectors? Where did you get them?

I have heard that unless they come from a “good “ source their performance will be questionable.
 
JerryMT

JerryMT

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Kubota M4500, NH TD95D,Ford 4610
Jun 17, 2017
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The Palouse - North Idaho
Mike.R.B said:
After a full rebuild the engine would start then cut out, and air would be in the fuel rail. Lots more cranking and the same would happen. I took off the diesel rail pipes and cranked the engine and bubbles were coming out of the injector inlet, obviously feeding "air" back into the rail.

I even swapped the injector pump from another engine, but same problem.

I assumed bad injectors from sitting around while engine work was being done.

Bought and installed new injectors but same thing happening, but one is particularly bad, with puffs of exhaust.

What's going on here?
Click to expand...
Is you valve timing and you pump timing correct? Is your fuel delivery to the IP adequate?
 
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M

Mike.R.B

New member
Aug 17, 2020
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UK
As far as I can tell from all the dots lining up correctly, all the timing is fine.
It fires up and runs for a second then cuts out.
The problem is 100% exhaust coming out of the injector inlet into the fuel line, I have video of this but it wont upload to here. I'll upload to youtube and link it in.

It was happening on all three of my old injectors, but now happening on 1 of my new ones but to a larger extent.

They come from a reputable Kubota parts company. I'm just about to call them and see what they think. Hopefully a replacement will sort out the issue and all will be well!
 
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