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43A Pistons

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Big Z

01-09-2002 18:51:29




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Can somebody tell me if late model A pistons will fit a 43 A block.I know there is a difference in compression but was wondering if the pin dia. and compression height would work.Reason I ask is there is a big difference in price of pistons and thought it would be an easy way to get a little more compression.Tractor is hand start so if they would fit,I had planned on drilling out the comp.release valves a little.Ser.# on tag is 528---,can't read the last 3.Thanks in advance, Big Z

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WTW

01-10-2002 07:07:18




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 Re: 43A Pistons in reply to Big Z, 01-09-2002 18:51:29  
Big Z, The late piston will work in your 44 A. The connecting rod pin diameter is the same as is the rod. The late A used the same rod (babbit type) or a newer style rod with insert type bearings. It will raise your compression a little but that will be a plus. It won't be so much that you will need to drill out your compression releases. Allot of times when people drill the compression releases out they make a hard starter out of there tractor because the larger hole will allow to much fuel / air mixture to escape and results in not enough product in cylinder to start on. I got a tractor that is 10 to 1 compression ratio with a power block and I start it by hand with no compression releases. It is a bit of a trick and not everybody can do it but if tuned right it can be done. It would be better if it did have compression releases because it would be allot easier on my physical well being. Your tractor will start / crank easy compared to this. Good luck, Dave W.

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Todd

01-10-2002 05:59:57




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 Re: 43A Pistons in reply to Big Z, 01-09-2002 18:51:29  
Like the last gentleman said, there is a difference in the pin diameter for the late and early A's. You could have used later rods or in the case of 37 A I once owned, the rods were taken to a local machine shop where the brass bushing was enlarged by a machinist with a small brake hone until the late wrist pin fit. On a 43, the pin size may be the same as a Late A. Most aluminum piston overbore kits sold today are for late series A's so unstyled upto 39models would have to have this modification or different rods. Also if I'm not mistaken, 34'-39' model A's have a 6 1/2" stroke, and 41' and up models have a 6 3/4" stroke. A late model gas piston (cast iron usually) will give your a little more compression than the standard flat tops used in the earlier models, but not as much as the aluminum pistons sold today. Advantage - more power, smoother running.

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Will P

01-09-2002 20:14:59




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 Re: 43A Pistons in reply to Big Z, 01-09-2002 18:51:29  
Don't know the answer for you. But I am interested too as I have a 43 A also. But, if your serial number is 528---. It is a 1944. Mine is 521175. 1943 ran 520004-524422. You should have a cast iron frame and a presure cap on the radiator and a steel serial number tag. Any way, same block. Hope someone can help.

Will P



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walt f

01-09-2002 21:59:42




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 Re: Re: 43A Pistons in reply to Will P, 01-09-2002 20:14:59  
i had to change pistons in a 1939 "a" but could not find the right pistons for that year so went to a later year, the difference being the size of the wrist pin, to use a newer piston, i had to go to a newer rod. all the rest of the specs were the same, bore, stroke, crank. diameter, length of rod. compression ring diameter was also different between all fuel and gasoline. a good investment has always been a parts book for the tractor you have, to let you know what parts will fit what tractors.

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