Because of the potential for further damage and operator safety risks, properly diagnosing and repairing worn kingpins, bushings and tie rods needs to be addressed promptly.Īfter experiencing symptoms of a kingpin and bushing failure, additional diagnoses must be done to rule out other wheel assembly issues that may also cause similar symptoms. Experiencing these symptoms while driving may result in a shaking cab or steering wheel. You will notice signs of kingpin and bushing failure from incorrect vehicle alignment, premature and uneven front tire wear, and rough handling. These are NORS king pin sets.Improper lubrication of kingpin bushings can cause kingpin contact points to begin to wear at the steering knuckle. If you need king pins for your 31 Chevy, I believe i have standard. This has now been illegal to do for a number of years because of a safety issue. Then use an adjustable reamer to fit the new king pin. We would heat the axle eye up red hot with a torch and then hammer it down to shrink it and then let it cool slowly. Usually you try putting shims in until they are just snug and then leave one out.īack in the 80s when I first started working on heavy trucks, it was common for an axle with a single wedge pin to slightly wobble out. Do not get too tight or the grease caps will blow off when greasing the assembly after it is assembled. Shim the area between the top axle eye face and lower spindle eye face to get the correct thrust. This will simulate the load on the thrust bearing. Apply enough pressure to just barely lift the axle off the jack stand. Then place a small bottle just or floor jack under the bottom end of the spindle with a block of wood. When assembling the spindle back on the axle, installed the king pin and thrust bearing dry. Before installing the spindle on the axle eye, touch up the thrust surfaces with a file to get rid of any nicks or uneven areas that will give you a false reading when checking the thickness of the thrust washers to be installed. Using a piloted reamer will work but a better fit is the outcome of line honing. If possible, have your kingpins fitted in the new bushings at a machine shop that can line hone them. This will let you know what to possibly expect when you take it all apart. Before taking the front axle apart, check for wheel bearing play by tightening the wheel bearings to see if your play goes away, tighten up the wedge bolt in the axle eye to see if the king pin is actually loose in the axle eye and with the axle on jack stands, use a heavy prey bar and block of wood to see how much up and down play you have. If excessive were is noted in these areas, then a special hardened thicker shim may be need to be installed to control the up and down play of the spindle. Most kingpin kits only come with up to 4 thrust washers. Beside getting everything apart, the main thing to check is kingpin fit in the axle eye and excessive wear on the thrust areas between the face inside the spindle and the face of the axle eye where the shims washers and thrust bearing are supported. As retired heavy truck technician, I replaced a fair amount of kingpins in my time.
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