L3240 ( HELP!!!! ) POWER LOSS, SURGES and BLUE SMOKE

5280GearHead

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L3240 HSTC Grand L, L514, Chipper, Grapple
Oct 15, 2024
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Denver, Co
My Fellow Gearheads,
HELP !! My Orange Angry Dragon is sick and need some experience suggestions. Here is the run down of symptoms to wrap your heads around.
The loss of power symptoms started happening last summer after taking the tractor to my property at 8700 ft elevation (Colorado), but doesn’t have any symptom of power loss at 5700ft elevation at the Dealer. The problem only exists at the higher rpm range, especially under any sort of load.
Now, Before we all jump on the ITS THE ELEVATION BANDWAGON, (which is what I originally thought as well), let’s hold hands and walk through my Pissed Off $$$$ moments together. I summoned the brain stormers at S2T Performance for some insight and 6 months later on about a Valentine's Day, a new baby turbo kit was dropped off on my door step, (Future posts on that turbo kit install coming in the near future). The turbo kit works awesome BUT I still have the same power loss, surging and blue smoking, just with much more power now.

First visit at the dealer, they verified the fuel tank and fuel lines were clear. They then removed a shim under the diesel injector pump to advance the timing due the elevation, which made no difference, maybe actually made the symptoms worse. I have adjusted the fuel psi up and down, no difference in symptoms. At this point I’m down to only a few items: 1. Fuel pump? 2. Injector Pump? (Very pricy). 3. Injectors? (pricey).
What’s Your thoughts Fellow Gearheads?
 

North Idaho Wolfman

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Blue smoke is not normally fuel related.

I would first do a compression test.
Armed with those numbers I can give you a better direction for you to go.
 
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RCW

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I expected you to say black smoke, not blue.

I agree with Wolfman.

Might be another Gremlin in the works....
 

5280GearHead

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L3240 HSTC Grand L, L514, Chipper, Grapple
Oct 15, 2024
11
12
3
Denver, Co
Thanks for the insight. Gotta get to the bottom of this hopefully rather sooner than later.
800hrs on the clock and the machine will run great great and then the performance goes sideways, then turn PTO off back the throttle down and it will run smooth as a kitten again. Head scratcher for sure.
 

5280GearHead

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L3240 HSTC Grand L, L514, Chipper, Grapple
Oct 15, 2024
11
12
3
Denver, Co
Guys, Quick question. I can’t attach a video to this forum of my injection pump cranking operation with fuel lines removed, but I will attach a photo. All 3 injection pump ports only burp fuel about 1/4” high, this doesn’t seem normal. I have seen BX 3 cylinders shoot fuel across the shop in cranking test??
Now, if I’m not mistaken. This would explain the engine running smooth until a load demand of higher rpm’s / 540 is imitated. Any thoughts.?
IMG_7595.jpeg
IMG_7594.png
 

North Idaho Wolfman

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L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
32,559
8,175
113
Sandpoint, ID
Your fuel also looks frothy???
If your starving the injection pump that bad it really shouldn't run at all.


Pull the fuel line feeding the injection pump and bottle feed it.
This eliminates all fuel delivery issues.
I don't think it's going to help you much.

I'm thinking the pump or governor has got an issue?
 
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5280GearHead

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L3240 HSTC Grand L, L514, Chipper, Grapple
Oct 15, 2024
11
12
3
Denver, Co
You could be right.
After applying a head psi to the fuel tank during the power Surging operation, the power surging clears up and then again returns when tank head psi is removed. So Kubota tech is thinking we have a fuel pump with a crack in the internal bellows. We will install a new fuel pump tomorrow and report back.
 
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5280GearHead

New member
Lifetime Member

Equipment
L3240 HSTC Grand L, L514, Chipper, Grapple
Oct 15, 2024
11
12
3
Denver, Co
Update:
Installed a new fuel pump and that my friends fixed all the power loss issues. Even at 8700 ft elevation the newly Turbocharged L3240 chewed through logs effortlessly with 6psi boost.
 

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