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No Arrow on new Pistons?

L

L wilson

New User
I’m rebuilding a Ferguson (F40) engine, and ran into a couple snares as I was getting ready to install the new pistons into the new sleeves.

Anyone know if the pistons that come in a comprehensive overhaul kit for a Continental Z134 are made in such a way that they are not directional like the originals?

Also, the recommended clearance of 0.0025” with ½ feeler gauge seems pretty loose.
I get some resistance more in the 0.003 – 0.004” range.

As a machinist, I’m accustomed to close fits, but from experience understand that printed recommendations can be better understood from someone with practical experience.

Any help would be greatly appreciated.
 
Your original piston "maybe" had a offset pin. Compare the replacement to that. Offset pin was design to take away side pressure on the piston on rotation. Sometimes there is just a dot or a little notch to indicate front. Who is the piston manufacture?
 
Just measure and see if the wrist pin is centered or off-set. If centered, it doesn't make any difference. If off-set, it goes to the thrust side. The clearance may depend on the material of the piston.
 
Also, the originals MAY have been "split skirt pistons", which were directional because the "split has to be on the "non-load" side.

Don't see many of those any more, I would ASSUME due to better alloys, the extreme being "hypereutectic" pisons
 
(quoted from post at 11:27:50 12/22/14) Your original piston "maybe" had a offset pin. Compare the replacement to that. Offset pin was design to take away side pressure on the piston on rotation. Sometimes there is just a dot or a little notch to indicate front. Who is the piston manufacture?
Click to expand...

Thank You

Pistons manufactured by TISCO.
 
(quoted from post at 11:30:28 12/22/14) Just measure and see if the wrist pin is centered or off-set. If centered, it doesn't make any difference. If off-set, it goes to the thrust side. The clearance may depend on the material of the piston.
Click to expand...

(quoted from post at 11:46:42 12/22/14) Also, the originals MAY have been "split skirt pistons", which were directional because the "split has to be on the "non-load" side.

Don't see many of those any more, I would ASSUME due to better alloys, the extreme being "hypereutectic" pisons
Click to expand...

Thank You all for the fast response!
I'll be checking to see if the wrist pin is centered.
 
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