Diesel in oil, Kubota V1505 engine

[JimE]

Hi guys,

 

I have a machine with a Kubota V1505 4cyl diesel engine on it.

 

Had a call today from the guy that runs it saying it is pushing diesel into the sump oil when running.

 

The seals on the 4 'plungers' that bolt in the top of the injection pump have been replaced as it was leaking diesel from the top of the injection pump. That problem is solved.

 

Any ideas what could be causing this? Its a new one on me!

 

I'm not with the machine and have very limited time with it in daylight, so hopefully I can gain some ideas of things to look at to best make use of time when I am there or get the guy who uses it to check it out.

 

Thanks

Jim

[Marko]

Our small kubota tractor had a seal go in the lift pump which slowly allowed diesel to run from the tank to the sump.

[JimE]

Hi Marko,

 

thanks.

 

No lift pump on this one, its got an electric pump. That was my idea too!

 

I'm thinking some seal in the injection pump, but you dont go taking that apart until you know what you are looking for!

 

Thanks

Jim

[ballibeg]

Injector stuck open? Fuel dribbling into cylinder and passing rings? Agree also pump.

 

Dave

[Breezeblock]

Injector stuck open? Fuel dribbling into cylinder and passing rings? Agree also pump.

 

Dave

 

if this were to happen i think it would run away with itself id be more inclined to say fuel pump seals

[Dean Lofthouse]

.......

 

Should read before I post (-:

[Stubby]

.......

 

Should read before I post (-:

 

Has an electric pumps he says ......

[ballibeg]

Quite common in td5 engines, more from cracked injector seats in head. They don't run on............just destroy themselves due to lack of lubrication.

 

Dave

Edited February 3, 2014 by ballibeg

[JimE]

I have more information

The engine does run on a little, it you rev it up, then drop the revs it will continue at higher revs until you put the engine under load then it will die back to idle and continue to idle until to rev it up again.

 

The seals that were replaced are shown as part 10 in the drawing on the link

Link

And look like the 2 o rings in the picture in the link below (note, not my engine and they dont look 100% the same, but its the only photo I could find on the net!)

Link

[gensetsteve]

It could be an injector take them out and pop test them. I have replaced loads of those pumps on generators. The main reason is a small amount of water in the fuel then hangs around the pump first frost expands and splits the pump have a look for the hairline crack.