Exotic ways to start an engine, part 5

"Cé hé sin" (michael-m-mouse) 09/29/2016 at 16:26 • Filed to: Lanz, Starting

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Here we have a guy starting an old tractor. As we see, he turns the flywheel and does something else. I’m sure I don’t know what else he’s doing.

CalzoneGolem > Cé hé sin 09/29/2016 at 16:29

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I think he dips his balls in it.

Jcarr > Cé hé sin 09/29/2016 at 16:36

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Is there some kind of hand pump that builds pressure in the cylinder?

Berang > Cé hé sin 09/29/2016 at 16:38

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He’s demonstrating the importance of electric starters.

Cé hé sin > Jcarr 09/29/2016 at 16:47

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I don’t actually know and the internets aren’t telling me, probably because everything about them is auf deutsch .

Jcarr > Cé hé sin 09/29/2016 at 16:49

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I’ve been googling for the past 10 minutes and I can’t find anything. My guess would be some kind of pressure or fuel pump to help get combustion going.

jimz > Cé hé sin 09/29/2016 at 16:52

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I think Jcarr is right. the guy in the video looks like he’s turning the flywheel to get the piston/crankshaft in the proper position, then pumping up a pneumatic cylinder to compress air to push the piston down. EMD locomotive diesels used this kind of starter setup (“air in head.”)

Jcarr > Cé hé sin 09/29/2016 at 16:58

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I think I may have shed a little light on it. Found this listing for a 1952 Bulldog with 2.3l engine.

It is fitted with a forward and reverse gearbox and the electric start system rocks the engine back and forth over top dead centre to get it going, adding an element of excitement as the driver is never quite sure which way the engine is running until a gear is engaged! The vendor uses petrol to start it , switching to diesel when it is running and states that it goes quite fast so would make an ideal machine for tractor runs.

I’m guessing this one is not fitted with an electric starter, so that’s what he’s doing with the flywheel. I would bet that pump is a gasoline primer of sorts.

EDIT: Found more .

The engine is then turned over with a starting handle placed in the starting dog on the flywheel. This is aided by the decompression valve, which decompresses the engine for anything up to 6 revolutions (generally 3 revolutions is sufficient - a spiral groove on the perimeter of the flywheel is used to determine the number of revolutions and position before top dead centre where the decompressor mechanism disengages and permits compression) to allow the flywheel to gain speed and inertia to turn the engine through compression, and get the engine to fire.

Berang > Jcarr 09/29/2016 at 17:29

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There’s a video of crank starting a Field Marshal (with the grooved flywheel) here:

But it’s a little bit different in operation than the Bulldogs. The lever the bulldogs have (and is seen being pumped in many videos) is a primer pump.

Matsayz > Cé hé sin 09/29/2016 at 18:34

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The other replies seem like they’ve figured it out but it just looks like a dangerous game to me