Diesel in oil, Kubota V1505 engine

[JimE]

So I have more information now.

Apparently the electric lift pump went wrong and it was replaced with a non-OEM pump that may have been a higher flow and pressure.

So do you think that it might have pushed a seal out the injection pump?

 

Steve, im not sure that frost is to blame, its been too warm, but do you have any ideas which seals might have become damaged by high fuel pressure? Have you had one of these pumps out? Any things to watch?

[Breezeblock]

So I have more information now.

Apparently the electric lift pump went wrong and it was replaced with a non-OEM pump that may have been a higher flow and pressure.

So do you think that it might have pushed a seal out the injection pump?

 

Steve, im not sure that frost is to blame, its been too warm, but do you have any ideas which seals might have become damaged by high fuel pressure? Have you had one of these pumps out? Any things to watch?

 

theres a relief valve in the gallery that should limit the pressure i would say if the engines been cooked the seals would be more likely to be affected than by high fuel pressure

[gensetsteve]

So I have more information now.

Apparently the electric lift pump went wrong and it was replaced with a non-OEM pump that may have been a higher flow and pressure.

So do you think that it might have pushed a seal out the injection pump?

 

Steve, im not sure that frost is to blame, its been too warm, but do you have any ideas which seals might have become damaged by high fuel pressure? Have you had one of these pumps out? Any things to watch?

 

We did have a hard frost a week or so ago and it stayed most of the day. From memory take the pipes off unbolt from block dont loose the shims under the pump they set the injection timeing. Might be worth talking to woodleigh power in Fareham see if they can test the pump and injectors. Once the pump is out there should just be four roller cams that work off the camshaft ie nothing to fall in. If there is no lift pump it has to be getting the fuel from the injectors.

[JimE]

Thanks Steve, I'll pop the pump out saturday and see whats occurring!

[Danson Sports]

We have a similar problem on the same engine on our Jacobsen LF4677 Mower

The mower would not start, we found what we thought was water in the oil so had the head skimmed and the gasket replaced, put it back together still wont start changed all filters, lift pump solenoid etc bleed the diesel still wont start!! checked the oil and it seems to have a lot of diesel mixed in with it, this is driving me mad!!

 

Question 1: what would stop the engine from starting?? it turns over and wants to fire up but just wont run!!

 

Question 2: What could be causing the diesel to leak in to the oil ??

[WeFixIt]

A non starting engine!

 

 

 

First thing to do is go back to the basic things!

 

 

 

Suck Squeeze Bang

 

Fuel/Air - Compression - Bang

 

 

 

1st. Have you got enough compression ?

 

 

 

2nd. Have you got fuel being injected into the cylinders ?

 

 

 

3rd. What colour smoke have you got coming out the exhaust. ?

 

 

 

Diesel can only reach the oil via 4 places

 

1. Mechanical fuel lift pump

 

2. The inline fuel injection pump

 

3. Past the piston rings

 

4. Past the head gasket

 

 

 

How much diesel is reaching the oil ( how much has the dipstick level gone up?)

 

 

 

Have you done a compression test?

 

 

 

Is the engine turning over fast enough?

 

 

 

Have you tried starting it with the fuel stop solenoid removed (does it have 2 wires or 3?)

 

 

 

 

 

 

 

 

 

 

Is it a chipper, is it a mower or another broken stump grinder who cares we'll fix it!

[JimE]

FYI, my problem turned out to be the seals in the injection pump. We removed and rebuilt it ourselves, turned out not to be a difficult job

[Ben 10]

Did you find the issue I have one doing the same thing now

[AngrySquirrel]

On 11/08/2020 at 11:39, Ben 10 said:

Did you find the issue I have one doing the same thing now

Say's above injector pump seals!

 

If late though should be common rail? so more likely injector leak as tips not sealing so allows rail to depressurise so drains into sump.

VW engines do it.

Electric injectors/common rail is constant pressure to injector the piezo shuts it where as older engines had pump/lift pump with injectors only feeding whats pumped at IP once turned over