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  #11  
Old 06-22-2017, 10:20 PM
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DeltaCub DeltaCub is offline
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Originally Posted by sir_lancealot View Post
So to those that have dealt with these engines...What was the point/reason for the dual fuel? Was it that the electronics of the era weren't powerful enough to crank/start the higher compression diesel engines?
I have heard it was a fuel cost issue.
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Old 06-22-2017, 10:28 PM
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Heats the compression chamber so the diesel would ignite easier. Not like the pony motor Jane Doe's used to spin over the diesel motor. Pre-glow plug or direct injection engines. The gas side also opened small valves in the head, one for each cylinder, to drop compression so it would start easier on gas. These gas start diesels are nice when they run good. Can get very pricey if the motors are stuck or there are issues with the motor/head. Notorious for cracking heads as well. Used to have 3 gas start diesels. Sold em and wish I had a couple back. Dad still has his 400 Diesel and 450 Diesel. Nice tractors.

Bet back in the day, it was an engineering nightmare. First gas start diesels Farmall had were the WD40's. Those were brutes..

Tim, that's a nice, straight 400.
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  #13  
Old 06-22-2017, 11:36 PM
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Originally Posted by sir_lancealot View Post
So to those that have dealt with these engines...What was the point/reason for the dual fuel? Was it that the electronics of the era weren't powerful enough to crank/start the higher compression diesel engines?
One engine only, no pony like Cat and Deere. Batteries/electrical just were not that reliable for diesels at the time. Also, you could still hand crank these machines. Dad worked for a neighboring farm driving their TD-14, he had to hand crank it--to be clear he had to crawl over the blade to do so, I certainly wouldn't have guts enough to hand crank anything in that confined of a space.
The gas was strictly for warming up, you may could putter around the farm yard but that was it. Don't confuse these with the older engines that ran on kerosene (distillate) or gasoline.

Interesting footnote (going by memory) IH made the first wheeled tractor with a diesel, Cat made the first crawler (tracked machine).

I used to want one of these tractors bad. Lucked up on an ID-9 not far from the house. Rainwater had gotten on a piston and busted a sleeve (dry sleeves), so the engine was gone. Sent it down the road as a parts machine. Seems like it wasn't that long ago, it was actually 25 years ago.
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Old 06-23-2017, 07:25 AM
mrfred54 mrfred54 is offline
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the engine was not a high compression diesel as today's are, which made them hard starting. once warmed up with the gas it would take right off when switched to diesel. once glow plugs were developed as with the 656, 706 tractors the gas part of the motor was not needed. now the diesel engines are high compression and are direct start engines with no assistance needed unless your in colder climates like here in mich. in the winter we use block heaters.
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Old 06-23-2017, 05:02 PM
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...right. When the gas start diesel engines were developed/manufactured there was no such thing as a start on diesel engine. It wasn't a thing. JD couldn't do it so they had a pony motor. (a 4 cylinder engine to start a 2 cylinder one. )
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Old 06-23-2017, 05:23 PM
sir_lancealot sir_lancealot is offline
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Originally Posted by mrfred54 View Post
the engine was not a high compression diesel as today's are, which made them hard starting. once warmed up with the gas it would take right off when switched to diesel. once glow plugs were developed as with the 656, 706 tractors the gas part of the motor was not needed. now the diesel engines are high compression and are direct start engines with no assistance needed unless your in colder climates like here in mich. in the winter we use block heaters.
No assistance? Like glow plugs? My car has glow plugs for starting. I have to wait for the little "coil" light to go out, otherwise it starts hard. That's why I was curious about why the gas side was needed. I assumed the electronics technology wasn't there for starting aids.
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