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Old 05-01-2009, 12:34 PM
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Con-Rod Small-End Bushing Test

Oh my......putting my engine back together (Ford FE with floating wrist pins) and noticed 1 rod seems to have a bit of play in the top bushing. It's barely perceptible, in fact, I have to clamp the rod big end in a vise and try twisting the piston. I can just barely tell there's some movement. In fact, sometimes there doesn't seem to be any, but then I check again and sort of feel a movement. Seems to me the spec calls for less than 0.001" of clearance, something like 0.0003" to 0.0008". Not the easiest thing to measure, hence the "twist and feel" test.

There is no movement of the wrist pin in the piston that I can tell. Seems to be in the rod.....but it's so small.

I already installed the piston/rod assembly, but as it's not too late to take it back out, I was thinking of checking it again. I guess the Machine Shop could get a bushing and put it in for me.

Anyone know anything about checking the con-rod small end clearance and what's OK, and what's not?

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Old 05-01-2009, 12:43 PM
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Are the pins fitted to the pistons from the manufacturer?

You might try finding a "tight" feeling rod/pin and swapping them.
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Old 05-01-2009, 05:38 PM
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Quote:
Originally Posted by Argess
Oh my......putting my engine back together (Ford FE with floating wrist pins) and noticed 1 rod seems to have a bit of play in the top bushing. It's barely perceptible, in fact, I have to clamp the rod big end in a vise and try twisting the piston. I can just barely tell there's some movement. In fact, sometimes there doesn't seem to be any, but then I check again and sort of feel a movement. Seems to me the spec calls for less than 0.001" of clearance, something like 0.0003" to 0.0008". Not the easiest thing to measure, hence the "twist and feel" test.

There is no movement of the wrist pin in the piston that I can tell. Seems to be in the rod.....but it's so small.

I already installed the piston/rod assembly, but as it's not too late to take it back out, I was thinking of checking it again. I guess the Machine Shop could get a bushing and put it in for me.

Anyone know anything about checking the con-rod small end clearance and what's OK, and what's not?
It probably is nothing given you don't sense it all the time. Yeah, the clearance is might small, it takes a mic. driver to get this measurement.

All in all if it bothers you, a new bush can be put in by the machine shop and resized.

Bogie
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Old 05-02-2009, 03:57 PM
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It must have been my imagination. I pulled that piston/rod ****embly and removed the piston. Put rod in vice and tried to wiggle wrist pin. Fit seemed fine. Compared it to others. Same thing. Using two different measuring techniques, I repeated measuremtns about 20 times. Worked out to 0.0005" clearance, the max of the "new part" spec. Max wear spec is 0.001", so I'm fine.

I think I must have been accidently sliding the piston against the side of the rod and was feeling that impact when I did it before.

I'm not really a nut about all engine specs, but I feel some need to be exactly right. Thanks for the input.
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