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Allis Chalmers Discussion Forum
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Model B Overhaul Questions

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Bob in Colorado

08-14-2006 09:03:53




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Going to do an in-frame to my B because I got water down the exhaust pipe into cylinders. Anybody used the 3 7/16 kit on these tractors? Never done a wet sleeve motor before. Tips or tricks to ensure good seal and ease of install? Thanks in advance, Bob




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randy

08-14-2006 10:14:13




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 Re: Model B Overhaul Questions in reply to Bob in Colorado, 08-14-2006 09:03:53  
I just did mine no problems - my question is why not just take the engine out of the tractor and put it on an engine stand. its only 4 more bolts 1 large nut and a cotter pin. very simple to remove. you will have both seals if you get a complete gasket set. why not use them??? you can also check the crankshaft and clutch plate while you have it apart



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Dick L

08-14-2006 09:30:51




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 Re: Model B Overhaul Questions in reply to Bob in Colorado, 08-14-2006 09:03:53  
Is there a reason you would not want to take the block off and replace the front and rear crankshaft seals and check the oil pump?

In answer to your question clean, clean, and clean. That is the main problem most have in not getting a good seal on the sleeves. The new sleeve should set down in place before you install the O rings and turn by hand. If it does not you have not removed all the crud build up.
I would not put any thing in but the 3 7/16 pistons. No problem what so ever.

Some pictures that might help.

third party image

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Bob in Colorado

08-14-2006 12:02:19




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 Re: Model B Overhaul Questions in reply to Dick L, 08-14-2006 09:30:51  
Thanks, Randy and Dick L, for the quick response. I guess my reason for doing this in-frame is that the tractor was overhauled just a few years ago and I don"t have any oil leaks at the crank seals. The engine came unstuck easily but a couple of sleeves unseated when I did it. I know some of you will cringe at this but my budget dictates just reusing the pieces that I have. Also I have to get some hay raked soon and this is my only small tractor to do it with. I ordered a new head gasket and new o-rings for the sleeves.Lots of clean up and elbow grease and I"ll use a glaze breaking hone on the sleeves and call it good. Yeah,I"ll probably lose a little compression and maybe use a little oil but, as my grandma used to say, "poor people got poor ways". Some day this little beast will get the full treatment but for now she"s still got work to do.

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Dick L

08-14-2006 13:24:10




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 Re: Model B Overhaul Questions in reply to Bob in Colorado, 08-14-2006 12:02:19  
Tight budget is a way of life with me. I understand Sooo,
OK! You are not going to put in new sleeves and pistons at this time! Different thoughts then. You will still need to clean both the sleeves and the inside bore of the block so the sleeves will turn by hand before reinstalling. I have read where people have pounded the sleeves in with a block of wood and hammer. That way you stand a good chance of pinching an O ring and still have a leak. With every thing clean and the chamfer smooth you can place a block of wood over the sleeve and bump the sleeve down with the palm of your hand. You can feel the O ring enter. If after the O ring has started down it will then get a bit easyer untill the second O ring starts to enter the sealing area. If it does not get easyer and takes a lot of bummping to keep it going down you most likely had an O ring pinch out of the groove in the sleeve. If that starts to happen you can pull the sleeve back out and save the O ring. If you keep pressing down the O ring will be cut and have to be replaced. Some people beat then in and do not have a leak and will sware they did it correctly.

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Bob in Colorado

08-15-2006 20:40:40




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 Re: Model B Overhaul Questions in reply to Dick L, 08-14-2006 13:24:10  
Thanks Dick. Guess I've got to replace one sleeve and cylinder. Too far out of spec. After honing had over 15 thous taper and still was pitted and rough.



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