ihatepoundland Posted August 20, 2007 Share Posted August 20, 2007 I found some photograpshs I didn't post from Bishop's Lydeard Tractor show. Can't remember seeing a vintage tractor show without seeing at least one Field Marshall, they seem quite durable Quote Link to comment Share on other sites More sharing options...
Leakeyvale Posted August 20, 2007 Share Posted August 20, 2007 One appears to have had a little more TLC Quote Link to comment Share on other sites More sharing options...
Guest Powerdozer Posted August 20, 2007 Share Posted August 20, 2007 The old single cylinder thumper great tractor grandad used to run two on his farm, he said used to get covered in oil spots on his face looked like he had measels he told me Quote Link to comment Share on other sites More sharing options...
Kris Posted August 20, 2007 Share Posted August 20, 2007 NIce pics... Can anyone explain the reason behind the strange shaped exhuast? Quote Link to comment Share on other sites More sharing options...
dwain Posted August 20, 2007 Share Posted August 20, 2007 when ever i go to a farm show thay are always there when i see them i turn the other way Quote Link to comment Share on other sites More sharing options...
ihatepoundland Posted August 20, 2007 Author Share Posted August 20, 2007 NIce pics... Can anyone explain the reason behind the strange shaped exhuast? Good question....and why all three are different \ Are they different series? Quote Link to comment Share on other sites More sharing options...
britainswomble Posted August 20, 2007 Share Posted August 20, 2007 NIce pics... Can anyone explain the reason behind the strange shaped exhuast? Yup.............The Field marshall engine is a two stroke diesel and has no inlet or exhaust valves like a four stroke.... Most two stroke diesels have a "Blower" to blow clean air under pressure into the cylinder to drive the exhaust gases out of the engine and provide a clean charge of air for the next time the engine fires. The Field Marshall doesn't have a blower, so the exhaust is specially shaped to silence the engine and create a pulse of moving air which draws clean air into the cylinder after it has fired and the exhaust and inlet ports are open. It is only the shape of the exhaust which creates this effect. A Field Marshall will NOT run with the exhaust removed. Variations of shape of the exhaust depend on the age of the tractor; and like most things; as they find more ways to get more power out of an engine; the design will change. I hope you understood my reply. It's simple for someone with an understanding of two and four stroke diesel engines, but difficult to explain to someone who doesn't have the benefit of that knowledge. Quote Link to comment Share on other sites More sharing options...
Spud Posted August 21, 2007 Share Posted August 21, 2007 i love the field marshalls i have a few pic i might post up later from our last plowday Quote Link to comment Share on other sites More sharing options...
ihatepoundland Posted August 21, 2007 Author Share Posted August 21, 2007 Good explanation on the exhaust, I vaguely remember reading something like that about 2 strokes once. Quote Link to comment Share on other sites More sharing options...
ihatepoundland Posted August 21, 2007 Author Share Posted August 21, 2007 Do you need a Firearms licence to start one Quote Link to comment Share on other sites More sharing options...
nashmach Posted August 21, 2007 Share Posted August 21, 2007 Do you need a Firearms licence to start one You need to be bl00dy careful and strong as an ox and lots of luck Quote Link to comment Share on other sites More sharing options...
britainswomble Posted August 21, 2007 Share Posted August 21, 2007 You need to be bl00dy careful and strong as an ox and lots of luck There are two ways of starting a Marshall. If starting with a cartridge; there is an arrow on the flywheel which is lined up with a pointer on the engine block. When the arrow is correctly aligned it puts the piston just over top dead centre on the firing stroke, so that the explosion from the cartridge propels he piston down the bore fast enough to carry the flywheel over to the next firing stroke when the engine should start... Cold starting is assisted by a salt peter impregnated roll of paper which is held in the tap handle shaped holder, on the front of the engine. Before it is screwed into the front of the engine it is lit with a lighter and when the flame is blown out it glows red like a firework lighter. An early, non electric glow plug. Diesel from the injector is physically ignited in this way. If a couple of you want to start a Marshall by hand, you would use a "Glow plug" in the front of the engine to start from cold. The engine has a decompressor to make the engine easier to turn over by hand. To start, a small wheel connected to the decompressor is lifted on to the edge of the flywheel where it engages with a screw thread on the flywheel face. You and a friend start winding the engine over furiously and after about five turns the decompressor wheel winds off the edge of the flywheel giving full compression sufficient to start the engine using the momentum created by the spinning flywheel. As they say, when it fires.......don't let go of the handle. If you do it's best to run as far away from the tractor as possible and wait till the handle comes out of the flywheel. :o Quote Link to comment Share on other sites More sharing options...
NIGEL FORD Posted August 21, 2007 Share Posted August 21, 2007 Good question....and why all three are different \ Are they different series? the 5th pic is a series 1 & the others are all series 2 but I have not seen the parallel extension reducer on the first photos before, but it may have been where a canopy was fitted over the tractor a la contractors version which had winches for manouvring thrashers around on site etc. under adverse conditions The Series ones had that large protruding rear hub and the cigar shaped exhaust aswell as squared knobbed gear lever & diff lock handle among other subtle design changes like a smaller belt pulley on the nearside. All these features are of course replicated on our SCALEdown kits including different seats and mudguard widths, tyre size etc. Quote Link to comment Share on other sites More sharing options...
Kris Posted August 21, 2007 Share Posted August 21, 2007 Thanks Britainswomble for your explanation and i think i understood most of it. Quote Link to comment Share on other sites More sharing options...
ihatepoundland Posted August 21, 2007 Author Share Posted August 21, 2007 Yeah, cheers for the info...can't wait to see a marshall at the tractor show now ;) :D Was one method generally used more than the other? I guess once it was going, you left it going. Quote Link to comment Share on other sites More sharing options...
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