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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Piston and head for 77

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Can't even use

09-21-2004 06:29:26




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Needing to know what the diameter of the cylinder is on a gas 77, can't seem to get a set of rings to fit my piston! Also the torque specs for a head on a gas 77.




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J. Schwiebert

09-21-2004 08:52:14




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 Re: Piston and head for 77 in reply to Can't even use my name, 09-21-2004 06:29:26  
Let us attach this from another direction. What diameter piston do you have? Also measure the width of the ring grooves. So many 77 tractors have overbore kits I can think of 4 different diameters you could have plus not all used the same width rings. I also ran into a 77 here that had a military engine which is a different size from the above 4 plus many other differences. Head torque is 96-100 foot pounds.

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Can't even use my own nam

09-21-2004 10:35:35




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 Re: Piston and head for 77 in reply to J. Schwiebert, 09-21-2004 08:52:14  
I measured with a tape measure, gonna get a caliper this evening, and got 3 1/2". The rings I got are too big. Don't fit on the piston, too big, or fit in the sleeve, too small. I figure if I would have any problems the rings would be too small since maybe the sleeves were overbored. There I go thinkin again! Thanks.



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RAB

09-22-2004 08:49:36




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 Re: Piston and head for 77 in reply to Can't even use my own nam, 09-21-2004 10:35:35  
You could wrap a piece of thread several times exactly around the piston skirt, measure it"s "exactly" length and divde by the number of turns and pi. Shouldn"t be far out unless you use elastic thread, can"t count, or don"t know what pi is (3.142 or 22/7)!!! Won"t tell you if it is 10 thou. over, though.
Measure the ring width by measuring say 5 or 10 of the same size stacked together (or bits) and then estimate the width of one, taking into account average side play in the grooves.
Failing all this, get a caliper...
Regards, RAB

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Can't even use my own nam

09-22-2004 09:40:55




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 Re: Piston and head for 77 in reply to RAB, 09-22-2004 08:49:36  
We got the correct rings ordered, for some reason their book only listed the over bore kits but the book back in their machine shop listed the original and over bore kits. By the way I just so happen to remember pi from my highschool days and it is 3.141592654, all that will fit on a calculator anyways. Thanks for the help though.



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RAB

09-22-2004 12:30:28




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 Re: Piston and head for 77 in reply to Can't even use my own nam, 09-22-2004 09:40:55  
Glad you got it sorted. I sorta always look for an alternative with reasonable accuracy, if I am stuck without the Mitutoyo, or whatever.
Yeah, I know, Pi is indeterminant and has been worked out to millions of decimal places - but they won"t fit on your calc! Most new calcs have Pi on a hot key, but I still like to use a slide-rule - the battery never goes dead at an inopportune moment. It, too, has Pi marked on it. It impresses/baffles the kids at schools sometimes as they have never even seen one, as does having eight tractors and not having a farm!
Btw, is the top ring groove still "in service"? It may "oil pump" if the ring is too sloppy. I am just machining the top ring groove on a stationary engine piston, to fit an Oliver 80 compression ring instead, as a new standard ring would never bed-in properly. Machine shops can easily re-claim pistons which are "out of spec" in this respect.
Regards, RAB

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Can't even use my own nam

09-22-2004 19:18:09




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 Re: Piston and head for 77 in reply to RAB, 09-22-2004 12:30:28  
Yeah the groves are all fine, just had stuck rings in it. Honestly we never really used the slide rule in school but I have seen and even used one very little. I just know what Pi is off the top of my head for some odd reason and can do the math on paper if need be.



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