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piston pin bushings

E

ecar

Member
I posted this on the repair forum, but i figured I
would also put on Massey forum.
I just replaced the piston pin bushing doing a
rebuild on a MF285 (Perkins A4.318) and had to hone
out > 0.040" to get the new pins to fit. I noticed
that portions are honed past the brass colored
surface.
Are these bi-metal bushings? If so, do I have a
problem?
Thanks
 
Thanks. I think I knew that was the answer but I was hoping I was missing something.

The bushings are aftermarket parts. I got 4 made by Tisco (p/n 50128) that came with the engine rebuild kit. You would think that these would be right since the kit came with the pistons and pins.
After I installed one and saw how much I had to take out, I got curious and I ordered a replacement from YT made by A&I (p/n A-0050128). It seemed to fit a little better, but still had to take out 0.030" and the bronze has to be pretty thin.
I went ahead and installed the 3 I had left from Tisco.
Since I got the right part number from 2 different manufacturers, I am a little lost on where to go next.
 
I replied on your other thread on the restoration board. Get them from Agco. They are $16.44...that isn't much more than the aftermarket ones and actually cheaper than some of the aftermarket sources.
 
Thanks Jason-
I will call the dealer tomorrow and order them.
It's a shame that you pay a lot of money for a rebuild kit and have to buy replacement parts for your replacement parts.
Believe it or not, they also gave me the wrong rod bearings too! I got p/n 736878M91 with the rebuild kit and the upper and lower tabs weren't offset like they should have been. Had to reorder the same part number and got the right parts.
Once I get the engine finished I will get on the phone with Tisco and see if there is any way to get a partial refund. Something tells me there will be more parts screwed up.
 
I posted on the other forum, make sure and take the parts to a reputable machine shop. You have ruined the bushings, and will again if you hone them.
 
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