King pin diameter

[D. Jones]

I went to order a king pin set for my 46 1/2 ton and was told there are two diameters available .812 and .822. I'm not sure why there are two diameters as it would seem that if there was enough wear to go through the bushings and damage the axle or spindle where the pin goes through, then the axle and spindle would need to be replaced. If the wear was contained to the pin and bushings then there would be no need for the oversize. Surely there was a standard size that all were built to.

Color me confused.

[Ross F-1]

They do sell 0.010" O/S pins and bushings for damaged axles. The trick is finding someone who can ream the axle O/S accurately (angle/size), and naturally they aren't coming to you, you need to take the axle in to them.

If your axle isn't wallowed out, stick with the .812"

[Pete]

If it won't clean up at the standard oversize it can be sleeved back to standard.
This is far better than replacing the axle with a used one. You are not going to find a used one that is not worn also.
Most machine shops that specialize in truck stuff can sleeve an axle.

[D. Jones]

Thanks for the information guys. I was fairly certain that was the situation because nothing else made sense. It appears that my axle is standard, if it's not I can bore and sleeve it back to standard as I have the tools and ability.

Thanks again.

[rotorwrench]

Some of those old axles just get a bit of fretting in the bore. If they would hone out to just a .010" oversize then I can see the possibility of using an oversized pin as a fix since it would only require a bit more reaming of the bushings to get all the stuff to fit right. If the axle is worn more than that then the sleeving of the bore would be the next fix.

[296 V8]

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Shrink the end and re ream ... I do it all the time.

[Pete]

Originally Posted by 296 V8

Shrink the end and re ream ... I do it all the time.

Yes that works for sure. There is a limit to how much you can shrink though and I would hone rather than ream.

[296 V8]

The last one I did a few weeks ago was a 34 axle that had some old .010 over pins in it.
The customer wanted to get it back to stock pins … couldn’t find any new over size pins.
　
I heated and quenched two times in oil and that was all it took … they were right there.

I find new 13/16 reams on eBay for cheap … sent right to my po box