King pin bushing hole alignment
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Senior User
Joined: May 2017
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From: Raleigh, NC
King pin bushing hole alignment
Is it normal for the king pin bushing for a F1 holes to be slightly off center from the zerk fitting hole? They don't line up perfectly but still allow grease to pass. First time doing king pins. Machine shop did hone these vs reaming.
I used the kit of Speedway when I got the brake kit.
I used the kit of Speedway when I got the brake kit.
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Senior User
Joined: May 2017
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From: Raleigh, NC
BJ, Rotational wise they are fine. Vertically is where the concern is. Grease will still go through and in to the bushing, so that's good news. However this being my first king pin bushing adventure I didn't know if anyone else had this experience. The bushing if I recall are symmetrical, meaning there is not a wrong or right way to install them as long as the grease holes line up.
Lead Driver
Joined: Dec 2012
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From: Wentzville, MO
You are correct. No difference top or bottom. In a past life time I owned a Brake & Frontend Alignment shop. We did pleanty of small truck king pins. We always sent out the spindles to have the bushing honed at our local machine shop. Some would come back with the holes dead on, some not that close. I can't remember a single one coming back prematurely due to a slight miss match of the grease holes. We did have pleanty come in for lack of grease!
Make sure to keep them lubed up. No more than 3,000 miles between lube jobs. Those old car/trucks weren't built like today with ZERO maintenance (except oil and Filter changes) for 50,000 miles.
Somewhere in the 70s they changed to a plastic bushing that no longer needed honing.
Make sure to keep them lubed up. No more than 3,000 miles between lube jobs. Those old car/trucks weren't built like today with ZERO maintenance (except oil and Filter changes) for 50,000 miles.Somewhere in the 70s they changed to a plastic bushing that no longer needed honing.
Cargo Master
Joined: Nov 2014
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I just picked mine up from the machine shop also. Same deal, machinist told me he drilled them a little before he honed them.
JB
JB
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Cargo Master
Joined: Mar 2002
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From: W (BY GOD) V
Well let me ask you this.
Just pressing in the bronze bushings and honing them for proper fit will ensure correct pin alignment and rotation install?
Just pressing in the bronze bushings and honing them for proper fit will ensure correct pin alignment and rotation install?
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As long as the hone is properly piloted into the lower bushing while doing the top one, and vice versa, no problem. Some shops use a piston pin hone, which is not long enough to be piloted. The other difference is, with a fixed diameter reamer like the tool shown, you can't cut too much. An operator asleep at the hone (or an adjustable reamer) can go too far and they'll come out sloppy.
Cargo Master
Joined: Nov 2014
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The problem I had when trying to do my own was that the reamer was twisting the bushing in the hole making the bushing hole to zerk hole misaligned, like 180 misaligned. That's when I said let the machinist do this job, it's a pretty critical part of good steering.
JB
JB
Cargo Master
Joined: Mar 2002
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From: W (BY GOD) V
So the more recent method is honing with a honing bar, correct?
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