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changing H engine from distillate to gas

A

amnion

Member
I want to change the engine on my H from the current distillate model to an actual H gas engine. I know, at a minimum, that I will need the gas engine head. Other than the gas head, what other parts need to be swapped? Valves? Rocker assembly? Etc.

Also, is the "fire crater" piston set a good option here?
 
You don't have to do anything if you just want to run it on gas. My H has never been run on distilate and it's made to like yours. Ever since it was new it was run on stright gas, or so I've been told. It does get better gas mileage with a regular gas head though. If you want to do that you can keep everything except just change the head I believe. I'm sure someone else can say some specifics.
 
I currently run it with gas, but it needs a rebuild anyway and the H gas engine gives several more HP; which is a big percentage when your talking 20-30 total.
 
As Tyler indicates it is OK as is.
If you want it to be as efficient as possible (HP/Hrs/Gal. of fuel) swapping the head for a Gasoline head (H, SH, 300, 350,) and putting sh sized pistons/sleeves, and domed pistons in it will make a great tractor out of a very good one. A 350 cam and intake/carb would wake it up even more. Be careful to match the piston pin size with what you have so as to not be dramatically disappointed in a batch of parts. Jim
 
Do it. This site has fine rebuild kits and prompt service. You will need a head, salvage yards should have many. Get a complete head, the distillate valves are different. Rockers and such should be the same. check out caseih.com for parts diagrams. put Farmall in the model box. Jim
 
The distallate tractors had a different manifold and also had starting tanks and radiator shutters. If you are ditching any of those distillate parts I would be interested in them.
 
Lots of distillate heads on old H tractors. Thing is when we overhauled them we put in a high altitude piston, like 8000' and that brought it up very close to an H with std pistons and gasoline head as far as compression ratio and horse power. The heads didn't have hard seats so valve life was not as good, but then again we put them in sometimes also and valve rotators on exhaust valves. Manifolds were usually shot anyway so had a gas one put on most of them.
 
...Manifolds were usually shot anyway so had a gas one put on most of them.
Click to expand...

So true, I would be happy to just have one that is just resembles a dist manifold. Same thing for the starting tank. I don't need on in perfect condition. Something good enough I can have a fuel cap through the hood and a fuel line out the bottom.
 
Sorry, those parts are long gone on this tractor. The manifold is still
the distillate one but it's shot and getting replaced.
 
(quoted from post at 17:29:59 03/20/11) Sorry, those parts are long gone on this tractor. The manifold is still
the distillate one but it's shot and getting replaced.
Click to expand...

Mine, too. Gotta keep asking or you will never find them. I have the manifold, but it is really in bad shape.
 
My 1945 H is a distelate fuel type and all i do with the tractor is road runs. T his last year i ran it on gas and itwas perfect. The best improvement was just ticking over in top gear instead of running it in fourth with revs on. I did a 36 mile run last year wich took 6 hrs with the off road parts. When I set off I had 6 inches of fuel in the tank and when I had done the 36 miles I still had 4 inches of fuel left. MJ
 
(quoted from post at 10:44:15 03/31/11) Did you ever find a starting tank? I have on with a hole in it but would fill the blank space in your hood.
Click to expand...

Me? No, I didn't find one. I haven't really been looking either. It is just one of those "if I see it" projects. Send me an email if you would like.
 
I don't see your email listed but you can contact me. I bought a tank on ebay with a hole in it, then found another that seems to be ok so I have an extra. Do an ebay search for Farmall tank. If you don't find what you need at good price I have this extra with a hole in it I don't need.
 
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