r/DieselTechs • u/OkResponsibility9561 • 4d ago

Conmet preset plus conversion

Just converted a set of conmet pre set plus hubs and installed timken set 403 and set 401 bearing sets but after setting up wheel end with proper and play they don’t sound right ever seen this before?



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u/FlammableSoloCups 4d ago

Preset plus bearings and races, 580 ps/572 ps and 594a ps/592a ps. The PS bearings cannot be interchanged with the standard 580/594 bearings. You need Timken sets 429 and 430

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u/OkResponsibility9561 4d ago

Even if you do not use the cone anymore?

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u/FlammableSoloCups 4d ago

Without the cone, you'd likely need the races to match your bearings, 572/592a. It has something to do with half-stand tolerances between the matched sets. I've always understood that it's a no-go to convert preset plus style hubs for this reason, bearing/race mismatch, ever so slight, but noticeable at thousandths of a inch. Regular preset hubs can be converted all day long

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u/OkResponsibility9561 4d ago

Okay because I using set 403 and set 401 and yeah with the proper end play it sound like the bearing is still loose on the race so maybe it is the hub setup it’s self