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Farmall & IHC Tractors Discussion Forum
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706 gasser rebuild

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nickWI

01-03-2006 17:38:09




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Well I'm sorta new to engine rebuilding. My dad & are doing a 706 gas with a 236 motor. I have pulled the the pistons out and ready for the sleeves. Will I be albe to get the sleeves out by hand, or do I need a puller? the head has 2 burnt valves and 2 pistons had the top rings cracked. CAn a machine shop rebuild the head, valves, etc completly, or should I tackle that? i'm taking my time and writing things down. just curious if anyone had any advice. I have been looking through the archives and found good info. 1 more thing I think i'd like to stay all stock, or do you recommend thinner sleeves, I 'd rather not take the block in to get bored. Nick

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the tractor vet

01-03-2006 20:03:02




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 Re: 706 gasser rebuild in reply to nickWI, 01-03-2006 17:38:09  
One thing that most people overlook on the C seires engine is the bore classifcation on the top of the block buy the cylinders you will see A-B C-D now when you get a rebuild kit from aftermarket they only come in A-B class and if you have any holes that are in the C-D class then the new sleeves will be loose in the bore and stand a 99% chance of snaping the flang off and pulling the sleeve down around the crank. Now the next thing is the deck of the block it needs to be checked for strightness and if needed milled down to true up when this is done then ya have to recut the counter bore and set sleeve hight and here again it will be off 95% of the time . Also the head will need resurfaced . Also have both ends of the rods redone . Now what you can do is make that old 263 into a 291 with the upgrade sleeves and this will make all bores the same but this requires boring the block and that is not a big deal and it realy spices up and old 706 gasser. Now if you do this you will have to cut the timming back to nomore then 20 degrees at full throttel as you have now uped the comp and the timeing is a big deal on the 6 cylinder and also the use of 93 octain gas also when fitting the pistons each one MUST BE MIC. AND A CLEARANCE OF .004 skirt to wall clearance MUST BE MAINTAINED each piston is differant and fitted to the hole that you put it in.

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Ross

01-04-2006 19:20:58




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 Re: 706 gasser rebuild in reply to the tractor vet, 01-03-2006 20:03:02  
Tractorvet I've read your comments concerning the gas engines in 706's ie high octane. Does this hold true for the 656 gassers as well. Are they as high tuned and sensitve? I know of plenty of 706's around my area that have burnt valves but I only know of one 656 gas in my area and it lasted quite a while and I don't believe the owner was the type to pony up for high octane. Just curious.
Thanks Ross

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ejr-IA.

01-03-2006 18:17:00




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 Re: 706 gasser rebuild in reply to nickWI, 01-03-2006 17:38:09  
I would check your engine number again 706 didn't use a 236 inless you should of typed 263 which is right.You will need a sleeve puller or make one.Take your head to a good machine shop and have it redone valves,seats,guides ,pressure checked and have the springs checked.Next have the crankshaft checked for wear it may need ground.I asume your takeing the engine out of frame and having the block hot tanked and new cam bearings installed.Theirs company's that have complete over haul kits every thing you need to do the overhaul.

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Greasey Hand

01-03-2006 18:10:02




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 Re: 706 gasser rebuild in reply to nickWI, 01-03-2006 17:38:09  
Bring the head in to a machine shop, You might need some seats replaced, at least ground, you need a valve grinder & seat grinder fo this work.
Are there grouves in the cyl walls? If there is they will need to be replaced. What are you going to do about the crank bearings? The sleaves are dry i think they should be pressed in, Best done by a shop if you never done it befor.



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