QuestionLeaders Posted August 30, 2015 Report Share Posted August 30, 2015 What is the outside diameter of a 620 pickup king pin bushing? Quote Link to comment
datzenmike Posted August 30, 2015 Report Share Posted August 30, 2015 There is no exact pin or bushing diameter for the reasons below... The clearance between the 620 king pin and the bushing is 0.0059" almost 6 thou. The bushing inner diameter (when fitted) is 0.7878" to 0.7888". Naturally the bushing is pressed or driven into the knuckle so the diameter varies and the upper and lower alignment also. It is intended to be reamed out to the proper alignment and clearance on the pin. In theory the pin is measured and the reamer set to be 0.0059" larger than the pin. 1 Quote Link to comment
QuestionLeaders Posted August 30, 2015 Author Report Share Posted August 30, 2015 I already have new kingpins but the machine shop pressed the bushings in wrong and messed up the first two so now i found some 620 bushings for cheap but they are non returnable will they fit in my 521? Inside and length match up so do the zerk holes. But I don't know the outside diameter is to see if that matches up. 1 Quote Link to comment
datzenmike Posted August 30, 2015 Report Share Posted August 30, 2015 You can just run a drill through the zerk threaded holes and through the bushings. Be sure to de burr them and clean away any chips. Try asking http://community.ratsun.net/user/11-mklotz70/ by private message. He's had these apart. 1 Quote Link to comment
hobospyder Posted August 30, 2015 Report Share Posted August 30, 2015 He's got videos too. I think they were posted in Canby thread. Youtube blue hands video king pin, should bring something up 1 Quote Link to comment
mklotz70 Posted August 31, 2015 Report Share Posted August 31, 2015 Which two did they mess up......two in the same spindle? or the same two, one each in a spindle? On the 620, I'm pretty sure the kingpins are the same, but the upper bushings are a lot thicker. I haven't looked specifically, but I think the bottom bushings are the same as the 521. I'll be rebuilding a set of 620 kingpins within the next month, but I haven't looked at the kit closely yet. 1 Quote Link to comment
Charlie69 Posted August 31, 2015 Report Share Posted August 31, 2015 As far as I know the 620 is metric and the 521 is SAE. Not sure if the king pins and bushings are the same size between 521 and 620. Quote Link to comment
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