Dramatic engine failure

Nodge68 · Nov 17, 2016

The Mad Hat Man said:
Is it an auto?
Has the gearbox oil recently been topped up/ changed?

Yes, yes and yes.
It's likely to be a worn reverse brake band.

The Mad Hat Man · Nov 17, 2016

Nodge68 said:
Yes, yes and yes.
It's likely to be a worn reverse brake band.

Or someone undid the wrong plug

xrv750 · Nov 17, 2016

Wow dramatic footage in that you tube vídeo.
I think that unplugging the battery positive terminal would kill the engine and thus saving it from total destruction.
In stressfull situations sometimes we don't think clearly, i recogn.

blue beasty · Nov 17, 2016

xrv750 said:
Wow dramatic footage in that you tube vídeo.
I think that unplugging the battery positive terminal would kill the engine and thus saving it from total destruction.
In stressfull situations sometimes we don't think clearly, i recogn.

No it wouldnt

Nodge68 · Nov 17, 2016

xrv750 said:
Wow dramatic footage in that you tube vídeo.
I think that unplugging the battery positive terminal would kill the engine and thus saving it from total destruction.
In stressfull situations sometimes we don't think clearly, i recogn.

No it wouldn't. The engine is running on the engine oil being forced into the cylinders under boost pressure. The only way to stop it is to stall the engine with the clutch. However sometimes that doesn't work as the clutch can glaze over and slip. The only other thing left is to remove the air or remove the fuel.
Cutting a boost pipe will stop the fuel. Blocking the turbo intake will stop the air.

The Mad Hat Man · Nov 17, 2016

xrv750 said:
Wow dramatic footage in that you tube vídeo.
I think that unplugging the battery positive terminal would kill the engine and thus saving it from total destruction.
In stressfull situations sometimes we don't think clearly, i recogn.

Not if it's a doozil

guineafowl21 · Nov 17, 2016

The Mad Hat Man said:
Not if it's a doozil

Come to think of it, would pulling a battery terminal even kill a normal running diesel engine?

The Mad Hat Man · Nov 17, 2016

guineafowl21 said:
Come to think of it, would pulling a battery terminal even kill a normal running diesel engine?

Yes - it kills the fuel pump

guineafowl21 · Nov 17, 2016

The Mad Hat Man said:
Yes - it kills the fuel pump

What about the alternator - I suppose it would eventually lose its self-excitement (no jokes, please - my wife is here).

The Mad Hat Man · Nov 17, 2016

Alt can be as excited as it likes - has no use on a doozil.

guineafowl21 · Nov 17, 2016

The Mad Hat Man said:
Alt can be as excited as it likes - has no use on a doozil.

I was just thinking while the alt is still excited it would be able to power the fuel pump

GrumpyGel · Nov 17, 2016

All earths go back to the battery don't they?

guineafowl21 · Nov 17, 2016

GrumpyGel said:
All earths go back to the battery don't they?

Argh. Someone's going to have to try this...

Way back I used to help my uncle on his farm, and he had a Peugeot 406 diesel whose battery was used to start other things. We used to start the car, then steal the battery to start other things. The car, equipped with fuel pump and stop solenoid, used to run happily without battery.

No too good for the alternator, though.

Edit: GG, there's still an earth return path from fuel pump, to frame, to engine block and hence to alternator.

Hippo · Nov 17, 2016

If the alternators turning and charging the battery, and you disconnect the battery, the alternators output is still feeding the system as it's all connected. Computers/lights etc will still run from the charging power. I would eggspect the engine to continue anorl.

The Mad Hat Man · Nov 17, 2016

Hippo said:
If the alternators turning and charging the battery, and you disconnect the battery, the alternators output is still feeding the system as it's all connected. Computers/lights etc will still run from the charging power. I would eggspect the engine to continue anorl.

agreed.

blue beasty · Nov 17, 2016

But what does turning the ignition off do that pulling the battery doesn't?

jamesmartin · Nov 17, 2016

GrumpyGel said:
All earths go back to the battery don't they?

only in that the battery is earthed to the car

Hippo · Nov 17, 2016

blue beasty said:
But what does turning the ignition off do that pulling the battery doesn't?

The ignition switch connects power to things. Like switching on the main relay. Some items like the engine computer/alarm/hazards are always powered, be it in a sleep mode sort of way when parked at night asleep. When turning on the ignition you power the main relay, which connects battery volts to items like fool pump, headlight switch, radio etc. Ignition switched oft with engine running will kill this as the main relay will open and remove power to powered items. More modern cars use a button switch to tell the computer to switch the main relay oft instead. Removing the battery when the alternator is turning means the temporary store of lecky in the battery is missing, but the alternator will still be able to power the electrics until you stall the engine or turn it oft with the key/button.

blue beasty · Nov 17, 2016

Hippo said:
The ignition switch connects power to things. Like switching on the main relay. Some items like the engine computer/alarm/hazards are always powered, be it in a sleep mode sort of way when parked at night asleep. When turning on the ignition you power the main relay, which connects battery volts to items like fool pump, headlight switch, radio etc. Ignition switched oft with engine running will kill this as the main relay will open and remove power to powered items. More modern cars use a button switch to tell the computer to switch the main relay oft instead. Removing the battery when the alternator is turning means the temporary store of lecky in the battery is missing, but the alternator will still be able to power the electrics until you stall the engine or turn it oft with the key/button.

Yep that makes sense. It's the break in the circuit that opens the relay.

Relays have never been my strong point, I always have to stop and think twice about them

GrumpyGel · Nov 18, 2016

blue beasty said:
But what does turning the ignition off do that pulling the battery doesn't?

Stops dirt and oil from getting under your finger nails.

This is the Freelander section - please keep up

Dramatic engine failure

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Leaks an prone to bits dropping off

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Lord Hippo

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Leaks an prone to bits dropping off

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Lord Hippo

Leaks an prone to bits dropping off

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