Diesel engine running away (non boaty)

[ProDave]

I post this here as this sounds very much like similar problems that have been discussed with boat engines before.

I have a Peuogeot TUD3 Diesel engine fitted in my mini digger.

It's a pretty straightforward installation. the engine directly drives a hydraulic pump. the hand throttle of the digger links to the throttle linkage on the fuel pump, just like the accelerator cable did when it was in a car.

The fault I have, is every now and then, the engine will just race away to quite high revs all on it's own with no throttle input.

I don't think the problem is anything to do with the fact it's in a digger and not in a car. It really is a simple instalation.

Engine oil and coolant levels are fine. Only 30 hours running since an oil and filter change. And the hydraulic fluid level on the digger side is fine. Fuel is fresh red diesel.

any ideas please?

this sounds to me bit like the fault I have read about before where the engine is burning it's own lubricating oil via the breather system. but in my case I'm not sure if it is that, as the engine will stop on the key, so that says to me it's burning diesel?

 

[boatmike]

Could be a broken spring in the fuel pump?

 

[Swanrad2]

Dunno if its even got one - but could be the governer. That was the problem on a couple of volvo diesels - killed the engine in the end on one of them when they couldn't crack the injectors off in time!

 

[ProDave]

It was doing it this morning even with the engine running at idle, so no input on the throttle linkage.

I'm not even sure this engine has a govenor.

 

[pelissima]

Two years back had the same at my Perk 4108.
Turned out 430 euros were due to the high pressure pump service shop.
They showed me the pieces they changed and they were really worn.

 

[sailorman]

I post this here as this sounds very much like similar problems that have been discussed with boat engines before.

I have a Peuogeot TUD3 Diesel engine fitted in my mini digger.

It's a pretty straightforward installation. the engine directly drives a hydraulic pump. the hand throttle of the digger links to the throttle linkage on the fuel pump, just like the accelerator cable did when it was in a car.

The fault I have, is every now and then, the engine will just race away to quite high revs all on it's own with no throttle input.

I don't think the problem is anything to do with the fact it's in a digger and not in a car. It really is a simple instalation.

Engine oil and coolant levels are fine. Only 30 hours running since an oil and filter change. And the hydraulic fluid level on the digger side is fine. Fuel is fresh red diesel.

any ideas please?

this sounds to me bit like the fault I have read about before where the engine is burning it's own lubricating oil via the breather system. but in my case I'm not sure if it is that, as the engine will stop on the key, so that says to me it's burning diesel?

A chap here withe the same issue :encouragement:
http://www.peugeotforums.com/forums/maintenance-9/tud-3-diesel-engine-running-away-73273/

 

[ProDave]

Sorted.

Most bizare. It was just low on fuel (this machine doesn't have a working fuel guage)

I dipped the tank and there was only 1" of fuel. So I filled it, and it's just done an hours work without missing a beat.

 

[Lakesailor]

So. It really does run on fresh air.

 

[davidbfox]

burning engine oil bypassing piston rings? that is what happens on old horizontal Yanmars especially if oil level is high. not sure if it can happen on a conventional engine. I stopped mine by blocking air intake.