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Super C Wrist Pin & Bushing Question

M

mrniceguy

New User
Hey Everyone,
I am in the process of a complete engine overall of my Super C. Quick question about the wrist pin and connecting rods. The connecting rods have a small hole in the top of the rod, that would appear to be designed to line up with a hole in the wrist pin bushing. Is it necessary for these holes to line up when installed for oil flow to the wrist pin?
Thanks!
-ben
 
(quoted from post at 08:06:51 01/08/20) Hey Everyone,
I am in the process of a complete engine overall of my Super C. Quick question about the wrist pin and connecting rods. The connecting rods have a small hole in the top of the rod, that would appear to be designed to line up with a hole in the wrist pin bushing. Is it necessary for these holes to line up when installed for oil flow to the wrist pin?
Thanks!
-ben
Click to expand...

Yes.

But, unless you have a "rod machine" to check the rod for straightness, and the equipment to check the large and small bores for size and "out of round" and the equipment to press the bushing out and in, and the equipment to precision hone it to fit the wrist pin, they need to go to an automotive machine shop, it's NOT a do-it-yourself job.
 
Thanks Bob, for your response! Ok, so I did a little test project on one of the rods: I used a shop press to get the wrist pin bushing into the rod. Being a novice, I did not have the mental aptitude to check as I was pressing that the hole I was referring to lined up with the hole in the rod. Bushing went in fine, but not lined up with hole. Then, realizing my assumed mistake, I took this as a further opportunity to test hone the bushing myself to see if this was possible and or a viable course of action. Used a drill, bench vice, and a cylinder hone as pictured below. Honed it down such that the greased wrist pin slides in and out with thumb pressure.
1) If I was to red-do this process, however, ensure that the hole in the bushing and to rod lined up do you think I will be alright?
2) Am I a total jack leg idiot for trying to DIY this as described?

mvphoto47516.jpg
 
You may have destroyed that bushing. I say this because the tool used to fit a piston pin is a reamer with guides that keep it absolutely perpendicular to the big end, and
cylindricity is held to .0001 or less. The hone you used does neither, and makes a bell shaped hole on both ends. The fit you achieved is good in terms of pushing it through, but
where it touches is not adequately correct and uniform. I know this is bad news, but I am being crisply truthful. There is an eighty % chance of failure/knock in that assembly.
No one does that by hand. Sorry Jim
 
Those bushings are fitted with a one to three TEN THOUSANDS clearance. Only to be done
on a properly set up honing machine. And yes the hole should line up too.
 
Thanks everyone for your replies! Sounds like it's worth the money to just bring it to a machine shop. Will do. I am curious though, is it safe to assume that what this fella has done in his video of a similar process more than likely going to fail as well?

[/url]https://www.youtube.com/watch?v=bfDJDczt15k&t=280s
 
Just as Teddy52food said, Max clearance from pin to bushing is 0.0003" (roughly 1/10th the thickness of an average human hair). I have used a CNC to ream them before and even then I snuck up on the final ID very carefully.
 
Hey ih560, I have everything gathered and about to take to a machine shop, but I wanted to double
check the clearance. You mention .0003, but in the shop manual i have it recommends .0004. Which
one should I spec for the machine shop?
 
I don't have the service manual with me, but if your book says 0.0004" clearance then that should be fine. They will most likely want to look it up their self too.
 
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