Through the years my brother and I have accumulated some known NOS Ford spindle bushings. We also have several NOS Ford king pin kits for both A and later V-8 as my brother has a 36 convertible sedan. I am putting together the frame for my cabriolet and took a look at the bushing in the kits and the assorted Ford script bushings.
One question that came up on Fordbarn was how did the spindle bearing get greased. This should answer some of the questions.
I need to point out that is this is not an exhaustive research article. This is our observations on the parts we had on hand.
In the 31 parts book I have they list two bearings for the spindle.
A3109 is the top bushing
A3110 is the shorter bottom bushing
The above photo is of what we believe to be the original A3109 bushing.
Notice that the groove from the grease hole goes to the top of the bushing. The second groove takes the grease from top, after it flowed though the bearing, and directed it to the bottom of the bushing.
Above is the B-3110 lower bushing. This bushing is slightly shorter than the upper bushing. Notice the grease groove is circular.
I am making an assumption that the above two bushings are the style found on the A when it came from Ford.
The following bushings are what were found on the spindle kits we have for both A and V8. They came in the orange and blue Ford boxes.
The left one is a steel shell with a brass liner. The grease groove is an eliptical groove and does not go to an edge.
The pair at the right are steel. The grease groove goes to the edge in one direction and stops before the edge in the other. I would assume that the groove going to the edge should be at the top towards the bearing. We are wondering if the steel bushings might have been a war time item when the copper and brass was all going to the war effort.
All the bushings in the kits were the same length top and bottom.
In all the kits the bearing were the ball bearing types and most were Ford script. One set was not Ford script.
It is recommended that when you install the bushings that seek out a line hone instead of a reamer. A reamer works, but will always have a bit of chatter. Chatter means you will not get a perfectly smooth bore. So the high spots will quickly wear flat and the bushings can loosen some, not much, but enough to be annoying. Line hone boring gives you a nice round surface and will not get that initial wear and the slight extra play.