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Discussion Starter · #1 ·
Hi guys, my D40 has had another major hissy fit! Engine had a 'runaway' episode where the revs go off the counter (over6000rpm) and won't turn off with the key.....very frightening in the main street of town!
What I found was that the sump was 6" overfull with diluted oil. When drained it measured 13litres. Anyone have any clues as to how diesel fuel can enter the sump?
 

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There's only one way diesel can get into the sump, and that's going past the piston rings. There are a number of ways this can happen though:
Leaking injector
Leaking injector pump
ECU massively overfueling
Engine has worn rings
 

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Discussion Starter · #3 ·
Thanks Cashie. What I should make mention of is that I had just changed the screw on head part of the No.1 injector. Maybe you can not interchange injector parts, but it was from another no.1 injector from a spare D40 engine. The car was running well with the new injector part, stopped it going continuously into Limp mode and was blowing no smoke!
 

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Thanks Cashie. What I should make mention of is that I had just changed the screw on head part of the No.1 injector. Maybe you can not interchange injector parts, but it was from another no.1 injector from a spare D40 engine. The car was running well with the new injector part, stopped it going continuously into Limp mode and was blowing no smoke!
One or more injectors are putting too much fuel into the engine. Injectors should be coded to the ECU too.

It would be wise to get an injector test at a local diesel specialist.
 

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Discussion Starter · #5 ·
Do you think the overfull sump would have resulted in the turbo 'runaway' or is that a different problem?
 

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Do you think the overfull sump would have resulted in the turbo 'runaway' or is that a different problem?
It is likely that because you had too much oil in sump that the engine breather was dumping fuel or oil into the intake tract.

That would have caused your runaway problem, so it is likely your problems are linked.
 

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Do you think the overfull sump would have resulted in the turbo 'runaway' or is that a different problem?
It could have done as diesel fuel is less viscous than engine oil and could by pass the seals and you would only need a small amount to get pass . In theory Turbo bypass either oil or diesel mix is the only way to give you the experience you had. How did it stop itself as usually the engine revs until it uses up all its fuel source which results in extreme internal damage to the engine. Never had it in a Nav but twice in discoveries .
 

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Discussion Starter · #8 ·
popsdosh, I was trying to stall it against the clutch but it was trying to take me straight into someones house....I think it just used up the burst of fuel/oil it got and then stopped as the ignition was off.
 

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popsdosh, I was trying to stall it against the clutch but it was trying to take me straight into someones house....I think it just used up the burst of fuel/oil it got and then stopped as the ignition was off.
how long did it last ? it could be due to excess fuel from injectors taking a while to burn up residue in the cylinder if for a short period. If turbo related they usually just carry on until burnt out the fuel source as the ignition has no effect on if it keeps running or not.
 

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Discussion Starter · #10 ·
When an engine is screaming its head off, uncontrolled it seems like an eternity...when, in actual fact, it was probably only around 20-30 seconds.
 

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Yup definitely sounds like excessive fueling of some kind getting into the oil which then pushed past the turbo seals and was "eaten" by the engine. (13 litres is almost double the normal amount of oil and would definitely play havoc). Hopefully you didn't do permanent damage to the engine. Obviously you must have injectors tested I'm sure at least one is toast and you must inspect the turbo properly as well in case the seals have now failed completely. Then new oil and filters and fire her up and hold thumbs.

As for it not running away completely perhaps this was due to the air shut-off valves on these engines. When turning off the ignition there's a butterfly that closes on the intake for a smoother shutdown but would surely also help in this situation. If you're trying to stall the engine go for 6th gear and dump the clutch but at WOT with the torque these engines produce who knows how well that will work may just fry the clutch instead. Not a nice situation.
 

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Hi guys, my D40 has had another major hissy fit! Engine had a 'runaway' episode where the revs go off the counter (over6000rpm) and won't turn off with the key.....very frightening in the main street of town!
What I found was that the sump was 6" overfull with diluted oil. When drained it measured 13litres. Anyone have any clues as to how diesel fuel can enter the sump?
Hi Mike

did you sort out the problem, it seems like we have the same problem as the oil is getting more in the samp

please contact us on WhatsApp if possibal
082 553 7684.
 
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