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Old 01-05-2008, 10:27 AM   #1
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??? about connecting rod bushing / wrist pin

I bought a brand new set of floating pistons and h-beam rods from the boards awhile ago that were already put together. Now the problem is, the rods will not freely move side-to-side by hand on the wrist pin even after applying lube. I've soaked them in lube thinking they probably seized together because they were dry when I purchased them. They will move though with light blows from a mallet. Since the lube thing didn't work, I pulled the spiral locks on one piston and was able to lightly tap out the pin from the rod/piston. The rod bushing doesn't seem damage. It did have some very light cross-hatches in them. Is that normal? They're kinda like the one's in a piston bore. I then lubed both the rod and pin and tried to press it in by and hand but was only able to get it halfway. Is it possible that the wrist pin is too large for this rod? Like the rod is .912 and the pin is .927 - is that the correct common sizes. I'll eventually get them measured properly but I'm working this weekend.

Sorry for the long post but please give me some thoughts.

Thanks
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Old 01-05-2008, 10:52 AM   #2
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I doubt you will not get a .927 pin into a .912 without without breaking something (.015 interference fit) lol. If the rod is truly sized correctly there should be clearance and the pin should slide right through. I am thinking like .0007 clearance if I remember correctly is pretty common. Which isn't much but it shouldn't bind the pin up at all.
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Old 01-05-2008, 02:54 PM   #3
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Originally Posted by 93_ChargedCobra_342 View Post
I doubt you will not get a .927 pin into a .912 without without breaking something (.015 interference fit) lol. If the rod is truly sized correctly there should be clearance and the pin should slide right through. I am thinking like .0007 clearance if I remember correctly is pretty common. Which isn't much but it shouldn't bind the pin up at all.
.007 clearance between pin and rod bushing? We'll see how much difference when I can take it to get measured. Anybody else have some thoughts?
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Old 01-05-2008, 03:46 PM   #4
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.007 clearance between pin and rod bushing? We'll see how much difference when I can take it to get measured. Anybody else have some thoughts?
Not .007 (7 thousandths) .0007 (7 ten thousandths or tenths)
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Old 01-05-2008, 09:16 PM   #5
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Not .007 (7 thousandths) .0007 (7 ten thousandths or tenths)

Ok...got it!
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