In a message dated 11/15/2004 10:50:08 AM Eastern Standard Time, “mark kosisko” firstname.lastname@example.org writes:
I have a 1993 Vanden Plas. ï¿½Can the rear wheel bearings be
adjusted/tighted like the front?
Also what are typical sounds/noises associated with a worn or bad
wheel bearing? ï¿½(ie thumping, whining, grinding, humming, etc.)
The rear wheel bearing end play is not a function of nut torque, but rather of preload build into the system via the dimensions of the hub carrier race shoulders, the bearing dimensions, and two spacers inside the hub. The rear axle shaft nuts are torqued to ~ 230 Ft-lb. and cannot be reused of loosened.
You can check the hub for end play to determine wear, but if end play or noise is excessive, the bearings must be replaced.
On my 89, I was getting a “roaring” noise, similar to the sound made by knobby off-road tires on hard pavement, from the rear (as opposed the the whine one gets on deceleration with a bad pinion bearing), and this noise was not speed- or throttle-dependent.
While I was replacing wheel bearings on both sides, I also replaced the output shaft bearings on the differential, even though there was no excessive end-play there, so I can’t be absolutely certain my noise was wheel bearings rather than output shaft (but I believe it was from a wheel bearing).
When I had a wheel bearing go bad on the front, it made a “groaning” noise, similar to a power steering pump low on fluid, which occurred in a turn at speed in one direction only (e.g. a right hand turn at 60 MPH loading the left front wheel where the bad bearing was).
George Balthrop, Clifton, VA USA
85 & 89 XJ-S Coupes; 89 XJ40 VDP
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