756 Gasser Update - Better News This Time...

(quoted from post at 12:59:48 11/05/18) They are not that hard to rebuild and as for cost well they are cheaper then getting into a D 361-407 . Hard part is getting the sleeves out and getting the correct sleeves to fit the holes as they were nver bored real close when they were built so you may find that you might have different bore class holesand they are stamped next to each hole , you have the A-B class and a C-D class bore , yopu can not use a A-B sleeve in a C -D bore because it will get sucked down around the crank in short order . Then comes fitting the pistons to the hole as here again not all pistons are the same exact size . ya want around .004 skirt to wall clearance . but this still does not eliminate them super heating at the top and having the top above the top ring swell well over .025and dig into the sleeves and seize the engine , or score the walls . I have farmed with 706 gassers for years and never had a problem till they started messing with the gas . Then we started seeing problems across the board , not just the 706-756's i was seeing it on 460-560's and some 400-450's with the big kits and the old timing curve . I have seen a lot of problems with gassers as around here we use to have a ton of gassers . My are use to be all small family dairy operations and most all had tractors in the 50-75 hp class . On the dairy farms tractors were run everyday 7 days a week with grinding of feed hauling the manure atleast once a day and maybe twice a day in all weather and the gasser was best suited for these tasks . Made many trips over to one farm on a 460 gasser that was bought new in 59 as it would do what yours was doing along with the once to twice a year valve job on that one . Each time i went over it was the same thing on the same fields the tractor would hall a full spreader out of the barn across the road and DOWN thru the fields and make the turn ans start back UP the field and make it maybe 200-300 feet and sputter cough and die and lock up , Well by the time he would walk to the milk house and call and me close up the shop and drive over and down to the tractor she had cooled down and start back up and run but it did have and ever so slight knock mid range in the block . It was usen a little more oil then normal and started to foul plugs so the farmer installed D 21's this made matters worse and she would super heat faster . When he bought it over for another valve when the head came off we saw the damage and it was bad , so he said rebuild it and get the parts at the one I H dealer here in town and put them on his bill So we did a Major on it out of chassis total rebuild of the head and while i was waiting on parts i went to a sale out west and got talking to and old fellow who i knew that was and OLD I H dealer about the problems i was having and he said ya see that fellow setting over there go talk to him as Bill knows more and when we had problems we always called him. So i spent a couple hours talking to Bill Bill also was and OLD I H dealer and him and his two brothers ran a large dealer ship and Bill ran the shop along with working with I H engineers on engine problems . And Bill told me why we were having valve issues and how to stop that problem and he and i talked about the piston swelling and scoring of the sleeves as i was pretty sure it was fuel related as this is something i was seeing back while i was a Ford tech and in charge of the dealerships drag program along with being the main big truck wrench . On this issue on the gassers god only knows how many times those heads have been off and how many times .010 has been removed to flatten them while doing a valve job or how many times they have blowen a head gskt as they pluym love to take it out between 3&4 . I have also found that every one i have tore down that the head bolts in the center of the head were all looser then the rest . there are a LOT of people that do not do a HOT torque it stuff it together and ship it . I hear guys complaining about seepage of the head gskt , yep another problem i have found that the Fel PRo is the worst of the bunch , myself i use only the GOOD Victor gskt. and i get them thru the Jobber ware house i get my engine parts from. as they have two gskt. We got along just finne with them up till two years ago when they changed the gas once again and bam that fast two went down a day apart on two different farms with the new load of gas . And NO i am NOT putting in anymore pistons it has become a waist of time and money . If i do anything it will be a diesel trans plant that will bolt in with out spending 6000 plus on a 3500 dollar .tractor.

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