04-04-2018, 01:39 PM
"Did the king pins"
Were the axle and stub axle eyes checked for being square to the pins?
Presumably stubs and axle shimmed out so no vertical clearance?
Passed abuse wears these surfaces so that they can become V shaped i.e more weare on the outside than on the inside faces. This can be tested for by checking any gap with feeler gauges. Try the outer part first (maybe about 0.001 to 0.004 inch)then try to put the same feeler that goes in into the area between backplate and kingpin.
The top picture shows the surface round the kingpin eye blued all over and square to the kingpin. Prior to grinding there was only bluing on part of the surface.
The bottom photo shows the pilot in the kingpin eyes with the cylinder fixed between the eyes.....this was used firstly with bluing to show the wear, then with grinding paste on the cylinder end to grind the faces true and square. Note the smaller diameter on the end of the pilot so it fits a drill chuck. From memory it needed 0.002 off top and bottom eyes, then there was the axle eyes so just add that lot up....say 0.001 on axle then 2X 0.001 + 2 X 0.002 = 0.006 wear. Shims may take up initial space at the least worn faces but there is still 0.006 wear at the worst faces.
Dennis
Were the axle and stub axle eyes checked for being square to the pins?
Presumably stubs and axle shimmed out so no vertical clearance?
Passed abuse wears these surfaces so that they can become V shaped i.e more weare on the outside than on the inside faces. This can be tested for by checking any gap with feeler gauges. Try the outer part first (maybe about 0.001 to 0.004 inch)then try to put the same feeler that goes in into the area between backplate and kingpin.
The top picture shows the surface round the kingpin eye blued all over and square to the kingpin. Prior to grinding there was only bluing on part of the surface.
The bottom photo shows the pilot in the kingpin eyes with the cylinder fixed between the eyes.....this was used firstly with bluing to show the wear, then with grinding paste on the cylinder end to grind the faces true and square. Note the smaller diameter on the end of the pilot so it fits a drill chuck. From memory it needed 0.002 off top and bottom eyes, then there was the axle eyes so just add that lot up....say 0.001 on axle then 2X 0.001 + 2 X 0.002 = 0.006 wear. Shims may take up initial space at the least worn faces but there is still 0.006 wear at the worst faces.
Dennis