Re: 1930 733 kingpin removal

Posted by DavidM On 2010/8/27 7:44:26

I would like to add my two cents worth to Peter's advice regarding new replacement king pin bearings. These comments are based on my 633's which I believe are the same as the 733.
I restored my first 633 using the Volkswagon bearings. I have since restored another 633 and have found what I believe are better bearings.
The top bearing can be replaced by a new bearing identical to the original. The number for the top double row ball bearing is YSB 5304-2RS.
The bottom bearing can be replaced using the lower king pin bearing from a Nissan Patrol 4WD, Its a Koyo Hi-Cap bearing number 3030 4A JRRS with seal. the advantage of this bearing is that it has a much higher load capacity and most importantly it incorporates a thrust face seal eliminating water ingress that can be a problem.
When grinding back the radius for the balls on the original king pin it will be necessary to measure the new bearing and lower housing to ensure some compression of the new seal. Also the lower bearing housing has 2 holes to allow a pin punch to be used to remove the bearing. These holes should be blocked with say Silastic to prevent entry of dirt and water into the new bearing which is open on the bottom.
I would have attached a sketch but failed after many unsuccessful attempts.
David Australia