I've never witnessed a case where ether damaged a gas engine in farm equipment. I suspect the compression is so low, the extra pressure from the ether seems to be pretty much harmless. Can say what happens with a car that might have 9 to 1 compression. I've never seen it needed.
As to the claims about ether not hurting diesels? I've seen plenty of diesels get ruined including many Deere 300-series that were direct-injected (NO glow plugs).
Anybody who claims otherwise I suspect never worked in a diesel repair shop in a cold-climate area.
Also about ether injection on factory equipped engines? Yes - and that injection system uses an injector orifice that limits overloading. Be it electric/solenoid injection or just a simple tube from the intake manifold - the factory installed units have limiting orifices.
My neighbor ruined the engine twice in one winter in his Deere 350. I'm the one that had to fix it twice and then told him "no more." A block heater would of saved him a lot of money. The first time he broke all his top rings and cracked one piston. The 2nd time -after being rebuilt he swore he'd use a block heater to start. Then one morning when it was below 0 out - his daughter got her car stuck in the barnyard. He needed his 350 in a hurry - and removed the air-cleaner cover and shot a bunch of ether in (again). This time he had two of the aftermarket pistons (Tisco) completely shatter to pieces. When I pulled the head there were two connecting rods with wrist pins - and no pistons. Just lots of pieces.
I've got an Allis Chalmers HD4 in my shop right now. The guy had a bad starter and weak batteries. His easy fix was to yank the air-cleaner bowl off and spray a lot of ether in there. He broke all the tops rings off of every piston. Still ran pretty good once hot but smoked and ate a lot of oil. And -impossible to start without a lot more ether.
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Today's Featured Article - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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