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Ford 9N, 2N & 8N Discussion Forum
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Honed lift cylinders get too big.

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Author 
Rob

10-11-2004 02:30:56




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Maybe your cylinder has been honed a time or three already. That oring should be a challenge to fit into the cylinder. I haven't measured the od of the ring to compare to the id of the cylinder. You have to shove pretty hard to get it in the cylinder. You may have the wrong ring but the od of the ring is not much larger than the OD of the piston. Consider that the FO-4 says the clearance of the piston in the ram should not exceed 0.0025". So the oring has to fit in that two and one-half thousands. Can't be much bigger than the piston. I would measure before I decide whether I need only rings, or ring and piston, or whether I should replace the cylinder. Two and a half thousands doesn't leave much for the hone especially if there is 1-1/2 or two thousands clearance between the parts when they are new.
Of course, the fix with the oring and piston is preferred by some because they save $60 or $70 on the rebuild but you might, probably will, be out of spec and have an oring holding a larger gap then it was designed to hold.
Contrary to board common wisdom I suggest the good rebuild is to reuse a serviceable piston and replace the iron rings and cylinder. $90 instead of $26 but you hold the spec and the cylinder is pristine without any scoring or scratches. In fact, if the old rings are not damaged and they gap ok in the new cylinder, which they probably will be because the problem is scoring and not wear, the old iron rings might go right back in, dunno. That saves $6 off that $90. Besides that, I like the idea of 3 iron rings better than the idea of one plastic ring because I'm pretty sure the iron rings will last a lot longer, especially in that rough cylinder. The other rams I own with orings have a polished surface.

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