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Removing Pistons Question!

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Scott S.

02-05-2001 09:32:57




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I pulled off the oil pan on my '42 H on Saturday. Looking from underneath, two pistons look bad, real bad.

Question: What is the best way to get them out when they are so corroded in? Can I buy new Connecting rods? I already have the pistons/sleeves soaking in Penetrating Oil. Can I pound them out from underneath?

When they Magnaflux a block, does it need to be completely taken down? I want to do the least amount I can, but realize that I will probably need to add sleeves, pistons, and rings. How do I tell if the main bearings should be replaced?

How do I take off the clutch linkage, plate and all that rot when I cannot turn the crank?

Boy, I am sure full of questions, huh? Nothing more though, I hope.

Thanks for your advice, all you Red Steel Pony jockeys.

Signed,
A wannabe Red Steel Pony Jockey

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scott m

02-05-2001 19:08:49




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 Re: Removing Pistons Question! in reply to Scott S., 02-05-2001 09:32:57  
rebuilding an h is not a great big feat. just trash the pistons and sleaves if they are that bad, it just make sense to put that much work in something that will just eat up a new set of rings. use a piece of 3/8 x 1" flat bar to pound the pistons out from the bottom you will be able to slide it next to the connecting rod so that you beat on the bottom of the top of the piston,that will get them out without any damage to the rod. if you take the input shaft of at the flex joint you will be able to crack the tractor without having to remove the clutch and pressure plate.
if you check the size of the journal on the crank you should be able to tell if you need bearings, they make bearings that are -.002 if your crank has some wear on it. when i bought my engine rebuild kit it came with everything i needed to do a total overhaul,

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Yellott Canby

02-05-2001 19:44:47




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 Re: Re: Removing Pistons Question! in reply to scott m, 02-05-2001 19:08:49  
I just finnished a rebuild on a 1941 H.One piston was stuck so bad I could not free it up. Ended up driving it up from below with a block of 2x2x12 oak. It drove the whole sleeve and all. The rest of the sleeves I pulled using a fairly home made puller of all thread and three 3.5" washers at the bottom. They fit the sleeves just right and they came out easily. Good luck!!
P.s Got a good overhaul kit from Clevite for around $380.00

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Yellott Canby

02-05-2001 19:41:30




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 Re: Re: Removing Pistons Question! in reply to scott m, 02-05-2001 19:08:49  
I just finnished a rebuild on a 1941 H.One piston was stuck so bad I could not free it up. Ended up driving it up from below with a block of 2x2x12 oak. It drove the whole sleeve and all. The rest of the sleeves I pulled using a fairly home made puller of all thread and three 3.5" washers at the bottom. They fit the sleeves just right and the came out easily. Good luck!!



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scott m

02-05-2001 19:07:09




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 Re: Removing Pistons Question! in reply to Scott S., 02-05-2001 09:32:57  
rebuilding an h is not a great big feat. just trash the pistons and sleaves if they are that bad, it just make sense to put that much work in something that will just eat up a new set of rings. use a piece of 3/8 x 1" flat bar to pound the pistons out from the bottom you will be able to slide it next to the connecting rod so that you beat on the bottom of the top of the piston,that will get them out without any damage to the rod. if you take the input shaft of at the flex joint you will be able to crack the tractor without having to remove the clutch and pressure plate.
if you check the size of the journal on the crank you should be able to tell if you need bearings, they make bearings that are -.002 if your crank has some wear on it. when i bought my engine rebuild kit it came with everything i needed to do a total overhaul,

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lee

02-05-2001 17:29:49




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 Re: Removing Pistons Question! in reply to Scott S., 02-05-2001 09:32:57  
Scott: I did not mean to discourage. Like oldfrmr says you can do it yourself if you put
your mind to it and no doubt you'll learn a lot
at that.



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Charlie

02-05-2001 15:13:52




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 Re: Removing Pistons Question! in reply to Scott S., 02-05-2001 09:32:57  
You may want to get out the rusted pistons and see what you have. I had a very rusted pistion in my W30 and when I got it out the sleeve was rusted bad enough it had to be replaced. Have you taken off the head? If there is water sitting in the pistions then spaying penetrating oil won't do much. I would think having it done by someone else will cost an arm and a leg. One option could be to buy a rebuilt block and head from Central Tractor. Thats not cheap either but you can compare the catalog prices with what ever a shop quotes you. I had a shop rebuild the head on my 300U. When he got done he charged me the same money as the rebuilt one from Central Tractor.

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Rich Cota

02-05-2001 14:28:07




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 Re: Removing Pistons Question! in reply to Scott S., 02-05-2001 09:32:57  
Scott, yes you can get new rods or you can get used at a salvage yard. You can also pound out the pistons from the bottom. It would be easier with the engine out and turned upside down. I am from the LaCrosse, Wi. area and all the machine shops here will do tractor blocks. If you brought in the engine to them , they would tear it apart and magnaflux it for cracks, mike the crankshaft and cam to see if you need new or to be machined and fit with new bearings and fit the new piston pins to the rods also.They will do as little or as much as you want. When they measure the crankshaft they will be able to tell you about new bearings.

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lee

02-05-2001 10:24:59




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 Re: Removing Pistons Question! in reply to Scott S., 02-05-2001 09:32:57  
Scott: Your H is in need of a professional rebuild. Save yourself some very serious
headaches and sleepless nights. Your questions tell me you should remove the engine and get it to a shop for re-build. You can pull the engine with an engine lift on a hard floor without unbolting
the clutch pressure plate. You will have plenty
to keep you busy without doing the overhaul yourself.



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Scott S.

02-05-2001 11:02:54




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 Re: Re: Removing Pistons Question! in reply to lee, 02-05-2001 10:24:59  
I called around to 6 machine shops in the Twin Cities area. Did not get a straight answer from any of them. Does anybody out there know of a Machine shop in the State of Minnesota that rebuilds H motors? It is starting to look like I am going to have to do it myself. Any ideas?

Thanks,

Scott



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Wardner

02-05-2001 11:27:33




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 Re: Re: Re: Removing Pistons Question! in reply to Scott S., 02-05-2001 11:02:54  
You need to go to an automotive machine shop. If you cannot find one, just ask your local parts counter guy where the shops are located. I bet the Twin Cities area has at least a dozen that will do what ever you want as long as you are willing to pay.



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tommyw

02-05-2001 12:17:50




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 Re: Re: Re: Re: Removing Pistons Question! in reply to Wardner, 02-05-2001 11:27:33  
you can rebuild it your self . i did my first one at age 15. get a good book and some hand tools. you will enjoy it more if you do it yourself. they arent that difficult.



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