[SEL] O.T. Test now question about touch paper

[Best, George]

The smoldering paper acts like a glow plug for the first few revolutions.

George

-----Original Message-----
From: sel-bounces at lists.stationary-engine.com [mailto:sel-bounces at lists.stationary-engine.com] On Behalf Of Kangas, James G.
Sent: Monday, August 10, 2009 1:36 PM
To: The SEL email discussion list
Subject: Re: [SEL] O.T. Test now question about touch paper

So does the paper actually ignite the fuel on the first compression stroke?
  Jim K.

________________________________

From: sel-bounces at lists.stationary-engine.com on behalf of Bob W7AVK
Sent: Mon 8/10/2009 4:24 PM
To: The SEL email discussion list
Subject: Re: [SEL] O.T. Test now question about touch paper



James - A writeup stolen off the net.

To start the Marshall a smouldering piece of special paper, containing saltpeter, is inserted into the cylinder head by means of the special screw in holder located in the cylinder head. The engine is then swung over by means of 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 at the back of the flywheel is used to determine the number of revolutions you turn it through before it comes up to full compression) in order to allow the flywheel to gain speed, and therefore inertia, in order to turn the engine over compression, and get the engine to fire.

A cartridge starting system is also fitted to the tractor. A shot-gun type cartridge is loaded into a breech on the engine's intake system.
The smouldering paper is placed in the cylinder head, and the cartridge is fired by tapping the protrusion pin with a hammer. This puts a charge into the bore, sending the piston flying through its stroke, bursting into life. This method, however, deposits carbon which often causes jamming of the decompression valve if cartridges are regularly used. It also puts significantly more strain on the moving parts of the engine.


Regards,

Bob R
Moses Lake, WA, USA



Kangas, James G. wrote:
> How is the paper used to start a Field Marshall engine? I'm not familiar at all with that engine. I have read about some Diesel engines that had a port into which was stuffed an oily rag that was then lit to help warm up the cylinder.
>     Jim K.
>
>  
>
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