Thread: Smoky D4 video

Posted this before. When doing the tune up on the GM in the M113 APCs the Army had, there was a printed sequence to follow. It was on a clip board. The clipboard was made of 4mm ally sheet. The purpose of this was to slap the clipboard over the air intake in the event of a runaway. Those old V6 Turbos were famous for runaways, probably because they were two stroke.

Originally Posted by scarry

One less Cummins..

One Kenworth looking for new motor

Bit of a let down really.
No spectacular boom, it either siezed or just starved when it ran out of oil.

What was alledgedy hillarious. Some bright spark decided to rebuild it....... It threw a rod and nearly tool out the dyno room.

Covered under warranty (newish truck) new crate motor put in.

Already back on the road. Have not spoken to the day shift driver, but i am telling every one of the night crew that drive it to grab the 9kg fire extinguisher.......

Well there you go. I’d heard if it but never seen it, let alone on a Disco. A self perpetuating cycle that can only be stopped by removing the air. I guess at least having a snorkel makes stopping the air easier by bagging it.

Originally Posted by DiscoJeffster

Well there you go. I’d heard if it but never seen it, let alone on a Disco. A self perpetuating cycle that can only be stopped by removing the air. I guess at least having a snorkel makes stopping the air easier by bagging it.

A few members here have experienced it resulting in expensive replacements.

As one of my mates said when it happened to him, he didn't know what it was and just wanted to get the hell away from it. He may have been able to choke the snorkel with a rag. Maybe.
Or dump the extinguisher down it.

All he could think to do was dip the clutch and let it rev into oblivion.

I've seen it once on a Volvo tipper and felt for the driver, he was just standing beside it with his shoulders slumped, smoke streaming form everywhere.

Originally Posted by DiscoJeffster

I guess at least having a snorkel makes stopping the air easier by bagging it.

Having the air intake on the side of the vehicle should make it even easier to smother with a plastic bag over it or similar without having to lift the bonnet of the screaming engine.

I will try it one day to test but I’m under the impression the journey from the side intake to air box is not perfectly sealed.

Originally Posted by PerthDisco

Having the air intake on the side of the vehicle should make it even easier to smother with a plastic bag over it or similar without having to lift the bonnet of the screaming engine.

I will try it one day to test but I’m under the impression the journey from the side intake to air box is not perfectly sealed.

Snorkel heads usually have four drain points to separate the rain from the air, a plastic bag would have to be drawn down to cover these slots. Not sure how much an ordinary plastic bag would stop before failing under vacuum.

I once machined up an old petrol engine throttle body to install into the air intake of a friend's D1 diesel, all it would have taken to operate is a simple choke cable. For some reason he never installed it, must be because he's never seen a diesel runaway video. One day I'll get him to fit it.

Originally Posted by bee utey

I once machined up an old petrol engine throttle body to install into the air intake of a friend's D1 diesel, all it would have taken to operate is a simple choke cable. For some reason he never installed it, must be because he's never seen a diesel runaway video. One day I'll get him to fit it.

That’s the same concept of arrangement marine versions of Detroit 2 strokes had factory fitted.

P.S. they sound great those engines

The air volume through a couple of small drain holes compared to the entire 3” snorkel flow for example are miles apart and should be enough to stop it if have thought