R

Robbo

Member
I start to pull away and the engine massivly over revs. Plumes of smoke, mild panic ensues, stop it by forcing a stall, leave alone.....
When its turned over again its fine and the engines sounds fine, just pumping out a bit of dark smoke prob due to poor injector spray patten. But i reallly don't want to drive it again until rectified.
Any ideas where to start?
Thx
 
So you go to take off, put the foot on the throttle a bit and then it revs like mad?

I would open the bonnet, start it up,then try giving it some throttle by hand by moving the arm on the injection pump that is connected to the accelerator cable. See what happens.

Does it do it if you give it some throttle without actully trying to take off?

I take it you stalled it because you cannot turn if off by the key?

Its almost as if its getting oil into the engine, and thats burning, what engine is it? Have you checked the oil level? If its very high, it could be someone put to much oil in, or your lift pump is leaking diesel into the oil, either if high enough could end up getting into the cylinders and letting the engine run on it.

Does it have a turbo?

More details please.
 
So you go to take off, put the foot on the throttle a bit and then it revs like mad?

As soon as i started it up, the revs flew up to prob 6k, and sounded like it was going to keep going. I prob touched the throttle out of habbit, but that was about it. I instinctivly stuck left it in gear and put my foot on the break to stall it.

I would open the bonnet, start it up,then try giving it some throttle by hand by moving the arm on the injection pump that is connected to the accelerator cable. See what happens.

This seems to be fine. The engine is happily ticking over as if it's done nothing wrong :) One thing to mention is that i ran out of diesel recently (due to my gauge sticking at half full), and a symptom was that the engine started to over rev. When i filled it up the overrevving stopped. However, this seems to be happening quite a bit now.

But on those occasions it wasn't a massive over revving. One other thing that threw me in to mild panic was the there was a pretty loud knocking which i really didn't like. And a great plume of blue smoke out of the back.

Does it do it if you give it some throttle without actully trying to take off?

It seems to be very intimmittent. But more oftern than not its only when it starts.

I take it you stalled it because you cannot turn if off by the key?

Yes, and it was a bit of a reaction too, it sounded like it was going to keep going, so to suppress the revs i put strain on it.

Its almost as if its getting oil into the engine, and thats burning, what engine is it? Have you checked the oil level? If its very high, it could be someone put to much oil in, or your lift pump is leaking diesel into the oil, either if high enough could end up getting into the cylinders and letting the engine run on it.

Its a 19J Turbo Derv. It was reconned a year ago. I did top up the oil a week ago and i'm confident that i didn't overfill it, however on the drive afterwards it smoked badly.

Does it have a turbo?

Yes, seems happy enough

More details please.

Thanks in advance.
 
What you have to do is work out wether there is a problem with the pump or the air intake.

As Disco suggests is it just a sticking accelerator cable or linkage.

As far as the air intake is concerned, is the breather pipe connected to the air intake? If so disconnect it and bung up the hole in the air intake hose. Is the air filter saturated in oil? if so clean it. Have the seals in the turbo gone and oil is leaking into the manifold? If so you need a new turbo.

You see all the above could let the engine run on oil mist. But having never experienced this I wouldn't know how well the engine would run and would expect it to sound like a bag of nails. And I wouldn't expect it to happen with a cold engine.
 
Blue smoke is burning oil, I think your engine is burning oil, as Grunt says, it could be turbo oil or the breather.

You say you thought it was going to keep going, this is what they do when they get lots of fuel, which I think in your case is oil.
 
Guys, I can't thank you enough for your help.

Latest update....

Taken her out on a run and all is well. Getting a lot more black smoke than i used to (but pretty sure thats just the injectors?), and no blue smoke at all.

I've noticed than when its warm the engine is over running when the accellorator is backed off.

Just to recap you're suggesting that either there is oil getting in to the engine via the Turbo or breather hoses which is adding fuel in to the chambers and causing the over revving prob. Is there an easy way to check?

Thx
R
 
Block the breather pipe off so that there is no chance oil can go through there into the chambers inlet manifold and then into the cylinders, also, clean the breather cap up, the mesh inside gets saturated with oilm use some Diesel/Kero etc...

If its the turbo, then you will be loosing oil check your oil level very carefully on a cold engine, then go a run, and check it again once the engine is COLD and parked in the same position if possible.

It could also be, that your oil level is too high, and oil is coming up into the cylinders with the pistons - more likely if your engines done a fair milage. Also if the fuel pump could be leaking diesel into the oil, which would bring the level up....
 
sounds like the turbo is sucking the oil in, this happens loads on td engines, basically yer turbo is knackered sorry ;)
 
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