Re: Building up a C263 gas engine...?

Posted by the tractor vet on November 09, 2006 at 08:30:40 from (75.19.125.61):

In Reply to: Building up a C263 gas engine...? posted by Sean Wetgen on November 08, 2006 at 22:24:16:

Ok heres the deal . When ya upgrade to the 291 kit to make your old 263 a 291 ya have to buy the special sleeves as they have a wider top flange on them as the 263 had a wide flange and the STOCK 291 had a narrow flange at the top of the sleeve . Now all the mods that i did to my buddy's 706 that he bought from me back about 17-18 years ago ran fine for 11 years before we had to real anything major to her . The worst repairs that we had to do was a couple leaking O/Rings and chargen problems with the genarator and that about made me a drunk along with the guy that use to do my electrical work as the gen. would check out just fine on the bench and work for a week or so and just plum up and quite . But back to what you want to do . If ya want to make the change then the block will have to be bored a bit and since it is alreay at the machine shop now is the time to make it wright . Now heres the deal when ya deck the block ya up the comp. not by much but you do up it and when ya mill the head to true it up ya up the comp. Now over the years of normal operation you have ware in the engine on everything and just before we tore eugene's 706 down we were eating exhaust valves like M&M's we tryed everything that i could think of to stop this talked to countless number of old I H mechanics and finaly talked to a guy out in Ind. that was a old I H dealer where him and his three brouther ran the famaily dealership and he ran the inhouse machine shop where they did all there owen machine work and he and i had a lenghty conversation on the subject and he gave me some insight on this and told me to change the oil that we were using and also check the cam for ware . Well when we took the engine down for the rebuild i found that the cam had ware off the top of the lobes and that the lifters wer starting to cup now this would HOLD the valve OPEN longer and thus cause a loss of power and also helped on the valve burning problem . So when i found this i had the cam rebuilt to Factory spec. and Blueprinted this makes everything the same all the way across the board . This was and old drag racers trick when running pure stock back in the good old fun days of hot cars and Mini skirts . so this will give all ya can get from a stock cam and the price was not bad to have the cam done it came to 175 bucks . Now balanceing the engine is the cheapest hourse power ya can buy and that cost us 200 bucks all the new pistons were weighed and balanced the rods were deflashed and polished we did that then they were all cut and balanced and resized . I got a littel carried away on this one as you would think that i was building a nat. record holder as the crank got polished and deflashed we lined bored the block just to true it up and it was out by just a few thousanths then my buddy set it up and bored it off the center line of the crank . On the head we rebuilt the head totaly and even did a C/C job along with a super good three angel valve job and HAND lapped the valves in . Everything was hand fitted and all pistons were fitted to each hole as the piston size varys and we built in .004 skirt to wall . Now if i ever do and other one i will put .0045 clearance to her because the pistons are not FORGED anymore they are Cast and they swell more under load . Now the down side of running a gasser from the 460 on up is that you have to run the high test gas , now i know that someone is going to come in here and say i am all wet on this but the whole time we were having the engine problems BEFORE the rebuild alot of it was the gas . Now if ya have and ORG. owners manual For the tractor and you read under FUEL req. it states in there that the MIN> fuel req. is of a good clean fuel of a MIN of 93 octain . Now here is and other thing that MOST people do not know that THIS alkihol that is being added to the gas of today causes a LEAN burn cond. and like we use to say in the racing ind LEAN IS MEAN and it will EAT and engine as this happened to this engine just after we put her to hard work as the fuel supplier DID NOT bring what we ordered and instead brought us what he called farm gas with his idea of lead subtatute and this caused the top of the pistons to swell and there for locked up the engine and scored the sleeves . Now luckly it did now realy do that much harm as a couple quick passes with the hone removed the piston material and they cleaned up just fine and a new set of pistons had to be reweighted and installed . The tractor ran super and layed down a solid 87 hp. at pto speed and would toqure rise to 97 down to 1250 engine RPM . Then two years ago the fuel supplier that we had been using hired a new driver and HE made the mistake and brought out a load of 87 . octain and we did not know and while grinding feed she ate #6 piston and i had to pul her down and redo #6 as 1 and 6 run the leanest on the gassers . Now as to carb mods here is what i did on that , i replaced the main ventura with a 1 1/8 ventua from a 806 then i had a local company that makes drill bits make me a REAM that was .001 bigger then the factory jet and REAMED the jet not drilled as just drilling a jet does not give a smooth finish . On the dist . i got the advance plate from Case I H for the 291 dist . and rebuilt the dist as the advance curve on the 263 is differant then the 291 as the 263 full advance is about 24 degrees and the 291 is like 18-19 and you can go as high as 20 but after that you are pushen your luck as this will cause detonation and will heat the tops of the pistons and lead to a seezed engine . We went thru the govener and realy did nothing other then repair the ware and a new spring and turned up the RPM a couple hundred . Now this 706 is used everyday for everything and in the winter is the only tractor that is used as we put the 1066 and the 806 to bed for the winter once the crops are done . YEs we went a littel overboard but it sure does run sweet . This 706 is a realy good one and she is a 65 model . Now we have done the engine the clutch and T/A and the hyd. and a new paint job and replaced the seat chusions three times and by spring she will need a new seat as well as the 806 and the 1066 . Would i do andother 706 gasser up the way we did this one YES in a heart beat. you would have to park your Arres in the seat and run her , The balance job made her so smooth running that that alone made a huge differance . We have done balance jobs on several tractor engines and the end results were nothing short of awsome .

Replies:

• Re: Building up a C263 gas engine...? Sean Wetgen 21:19:37 11/09/06 (2)
  • Re: Building up a C263 gas engine...? the tractor vet 07:53:34 11/10/06 (0)
  • Re: Building up a C263 gas engine...? the tractor vet 07:12:59 11/10/06 (0)
• Re: Building up a C263 gas engine...? ChadS 13:41:25 11/09/06 (2)
  • Re: Building up a C263 gas engine...? the tractor vet 19:03:20 11/09/06 (1)
    • Re: Building up a C263 gas engine...? ChadS 13:05:15 11/10/06 (0)

Add a Reply Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]