I've done a Hyundai Accent approx a month ago replacing both front wheel-bearings as the old ones started getting noisy and had high mileage on it.
Done many front-wheel cars front wheel-bearings over the years with no problems accept now this particular Accent.
Pirate wheel-bearings obtained and fitted to the Accent the normal and correct way it should be done and shaft nut torqued to spec and car given back to the customer. After approx one week the customer notified me there, s noise from the front wheels whereby I found the R/F wheel-bearing humming loud plus both front hubs were excessively hot.
Stripped both front hubs again but then started to look wy the new wheel-bearings overheated and failed
Bought another new set of pirate wheel-bearings but then pre-assemble the hubs on the work bench with dummy cv shafts and no brakes involved. Hubs turned but with much resistance - to much bearing pre-load found. These bearings one cannot adjust bearing pre loads as its made to have the correct pre-load once shaft get torqued-up.
Went to buy set of wheel-bearings genuine from agents and did finer measurements to see for possible size difference and to my surprise, found a 1 mm tighter bearing to bearing clearance which tightened up the pirate bearing, causing failures. One can make shims to make up the differences but its not the correct way as one buys pre determined correctly sized bearings for the purpose of correct pre-loads on the non adjustable bearings which gets torqued up.
Since then when I do especially front wheel-bearings which are not pre-load adjustable, I assemble the hub/s, fit it to the vehicle leaving the brake calipers off and running the engine and driveshaft in the air at approx 60 to 80kms/hr for say 5 to 10min then switch engine off for shafts to stop turning then feel by hand if the bearings and hubs overheat. Belief me, I found more cars with same issues where newly wheel-bearings overheats due to poor quality bearings or incorrectly tolerances.
One can make up small shims to fit between the bearings where the cones press against each other to ease the pre-loads on the rollers. I've used a few time x 2 0.3 mm shim stocks between the cones to get the bearings not to overheat.
Adjustable wheel-bearings where one can adjust the pre-loads with the shaft nut is simpler to do and any manufactured bearing thats a bit out of spec, the adjustable nut takes up the size differences unnoticed.
The pre-determined pre-load manufactured bearings where one torque the nut tight, can be a problem at times.
Its not always easy to exact work out the shim stock sizes to use But when one sits with overheating of newly fitted wheel-bearings thats of the parts rack which were supposed to fit correctly with its pre-determined pre-load torqued - its very concerning that can lead to a serious wheel-bearing seizure and possible serious car accident.
Wheel-bearings are made in mass by numerous manufactures and not always trustworthy to be flawless.
See photos below - same car, same part numbers, different makes with pre-determined pre-load sizing that differs drastically.
Images (Click to enlarge)
Friday, January 5th, 2018 AT 11:22 PM