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 in the cylinder head.
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. Depending on the condition and mood of individual tractors, it is possible to get a thorough workout starting the Marshall. Starting cartridge breech
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 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 engine.
Later versions of the Field-Marshall had more sophisticated starting systems available - electric starters were optional on the Series 3As.
Now, top that for wierdness!
The "expansion chamber" muffler must have a necessary component, looks like they all had it.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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