Re: We're ready to torch this 656. Help please!!!!

Posted by the tractor vet on April 26, 2006 at 20:15:35 from (66.202.111.110):

In Reply to: We're ready to torch this 656. Help please!!!! posted by BRSIL on April 26, 2006 at 15:26:37:

Well you ain't going to like what i am going to tell ya but here it is plain and simpel , First off i will bet that you did not size the pistons to the bore that they were going into as they must have .004 skirt to wall clearance . The new JUNK that you get today is not kept in close tolarence so there for ya have to Mic each piston and Mic each bore and then size it with a ridged hone . Second the timming must be dead on for full advance at full throttel . third you should also have over thiry hours of break in on light to med load befor any heavy work like plowen disken choppen grinding feed . Fourth ya have to run the 93 octain gas OR you will swell the top of the pistons and they will expand out past the skirt width and guald to the sleeves and give the symptions that you have discribed . So now if you are real lucky and the scroren is not to bad then you are out a head set a pan gskt 6 new pistons a set of rings and maybe you can hone the sleeves and put it back together , but you will have to use a ridged hone and you will need a good set of mic's both inside and outside one PLUS A BORE GAUGE . The factory org. pistons where what they call Forged and the NEW JUNK IS CAST and a cast piston can not disapate heat as fast as a forged one can and this is where the problems start and with the use of the 87 octain gas they get a whole bunch hotter faster then with the 93 octain as it burns cooler longer thus gives ya more power the 87 junk is blended to burn fast and hot and with the additves in it it makes it's owen oxyegn and this leans the burn out and lean is mean . I have been thru this before twice now because of 87 octain gas in a 6 cylinder I H . Yes they will run on the junk but don't try to make them do any real work or you end up with what ya got now . So don't shoot me for the bad news here but this is the way it is. SORRY.

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