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Z134 piston clearance

A

Anonymous-0

Well-known Member
I have new Tisco piston sleeve set (Not yet installed) and am not sure about the correct piston clearance. The manual says .0025 with the feeler gauge at the skirt?
1) Being the skirt is cam ground (.025 out of round)is the .0025 clearance measured at the tight area of the skirt?
2) What should the clearance be at the crown area where the rings are installed, I slipped a .009 feeler in at the crown with no problem, is this excessive?
I guess that after checking the piston to sleeve fit by hand the clearance seems excessive to me, the only area that seems to fit well is one area at the skirt
 
Outside mic.'s and inside mic.'s and a bore gauge . Check each and fit to each hole . What they are not telling you is that that way is the old RIBBON FIT , you use a specific thickness feeler gauge and a spring scale and you place the feeler gauge (usually a long blade feeler gauge) down along side the piston and wall and it has a specific pounds of pull to pull the feeler gauge up.
 
As TV indicates, the clearance should be measured with accurate bore gauges/mics. The use of a .009 feeler is so thick it could never bend around the radius or the piston, and the ring land diameter is way smaller than the skirt.
the piston clearance is measured at the center of the skirt, about 1/2way up to the beginning of the ring land diameter,from the lowest point on the skirt, 90 degrees from the piston pin. Pulling a ribbon feeler through that should pull with about 3 to 5 pounds of force. with oil on the skirt, and the feeler perpendicular to the pin, no rings. a A .0025 feeler will bend and conform correctly. Jim
 
Thanks for the quick reply guys. I understand the requirement for the mic and bore gauge (Machinist 30 yrs) which I have at work and will be using to check on Monday, its the clearances I don't understand, I only used the .009 feeler as referance to describe the top clearance which seems excessive? Hand fitting the piston in the sleeve it seems it would slap it's self to death, how much clearance on the remainder of the piston is acceptable? The top seems very loose to me? Does the top expand that much, or is this a non-issue? Is .025 out of round on the cam turned skirt normal? Thanks again for the help guys, this is my 1st tractor motor.
 
(quoted from post at 22:43:04 05/04/12) Thanks for the quick reply guys. I understand the requirement for the mic and bore gauge (Machinist 30 yrs) which I have at work and will be using to check on Monday, its the clearances I don't understand, I only used the .009 feeler as referance to describe the top clearance which seems excessive? Hand fitting the piston in the sleeve it seems it would slap it's self to death, how much clearance on the remainder of the piston is acceptable? The top seems very loose to me? Does the top expand that much, or is this a non-issue? Is .025 out of round on the cam turned skirt normal? Thanks again for the help guys, this is my 1st tractor motor.
Click to expand...

The rings take care of the top. Piston doesn't touch the wall at the top, but the rings do.
 
The T Vet..I think they mention that in the Fordson Book.
If not I have read it somewhere,so you are on the money.
 
The top does expand much more than the skirt, but it never touches the wall. Every design is some different, but in general they can be .025 to .015" smaller in dia. than the skirt. Not only for expansion, but for allowing proper ring activity in their lands. Jim
 
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