Technical .010 oversize king pins .. ream or setup in jig ?

Have a 50's F100 axle that is a tiny bit lose as to king pin fit

With a king pin in, there is around .001 movement

With the king pin halfway in, there is much more movement

Seems the holes are worn oval such as a valve guide

Shoud I set up a jig to make sure they stay the same degree as to king pin inclination ??


Ricky.

 

First best choice; replace axle, second best choice; heat kingpin boss red hot, hammer towards center of axle, ream to proper size (also works for door hinges).

 

What happens when you put the cross (lock) bolt in?

 

Buy a new king pin kit. Install the new bushings find a reamer then ream to fit then install the new pins.

 

Good advice, and a lot less expensive and time consuming as to replacing the axle.

 

The reason my first best choice is to replace the axle is in order to make certain the kingpin inclination is not changed when the axle boss is reamed oversize (and make sure both sides end up the same) any alterations needs to be done by a competent machinist, unfortunately, the cost of having the work done will probably exceed the cost of a replacement axle. Something else to consider; if at some point you want your axle dropped having oversize kingpin bores will be a problem.

 

Dennis_Lacy_earlyv8garage recently did a decent "how to" on shrinking kingpin bores on Instagram.

I can't believe that you would change the angle significantly, unless you really botched it.

I've done quite a few axles with no problems.

 

I have never worked on a Ford axle. Plenty of Chevy/GMC in the 1950s. If the king pin BUSHING was the culprit, and most were, replace and ream to fit we wanted with the new pin.

Ben

 

Why do you think the axle boss is over sized ? Did the old kingpins ware through the bushing ? If not have the bushing replaced . The Inclination will not be changed. If you want to have it perfect send it to Sid . JMO.

 

So where are you going to find an over size King pin kit? Normal wear happens at the spinal bushing not in the axle. You can try to shrink the hole in the axle by heating up a strip red hot and letting it cool If it did not shrink it enough try another strip repeat until it is small enough. Here is a down load , pay attention to confined expansion. https://www.engineerrefe.com/wp-con...Welding-Secrets-2nd-Edition-by-Hal-Wilson.pdf

 

OK, you are talking kingpin fit in the axle bore. If you could get 0.010" oversize pins would it be enough? I guess is not. So I guess your options would be:
1. Shrink the axle by the heat and beat method and ream back to size. Probably the most cost effective.
2. Install bushings in axle and ream back to stock axle hole ID. Costly since the axle will be reamed twice.
3. Replace axle with new if available. Just replacing it with another used one probably just gets you another axle like the one that you have.
If it was mine I would try #1 before buying a new axle. If you use a piloted reamer it should not change the kingpin inclination. And if for some reason you do, it can be bent back into the correct inclination. Most axles that get dropped need some tweaking to get them straight and correct inclination. Axles are bent if needed during alignment. So not that hard.