wheel bearings
donn - July 27th, 2012 at 10:50 AM
What's the most reliable way to determine if a bearing is on the way out, I suspect that I have a bearing going and I suspect it's in the front,
I've dropped the wheels off and spun the discs but all seems fine but I get a sort of slight rumbling feel when under way on the road, car is a bit
loud to hear anything but with Valla coming up I want to be as sure as I can that all is good. While typing this a thought popped into my head, maybe
the hub will feel a bit hot if it's a crook bearing?
Ideas please.
vwo60 - July 27th, 2012 at 03:44 PM
it would pay to take the hub of and visually inspect the bearing for wear.
Bob down - July 27th, 2012 at 06:38 PM
was always told a good sign bearing was going, was if the rim was warm to touch after travelling at speed for a fair distance. but im definately no
expert.
psimitar - July 27th, 2012 at 07:46 PM
going bearing rumbles and generates plenty of heat so grease cap will be hot to the touch.
With wheel on but jacked up spin the wheel and it won't spin freely for very long and will sound rough.
Once you've taken the disc off roll the roller taper bearing with a thumb to see how smooth they roll and then clean grease off and look at the inner
bearing surface. It won't look smooth and evenly coloured if worn.
matberry - July 27th, 2012 at 08:19 PM
I don't agree with the 'plenty of heat' as a RELIABLE diagnosis. If there is heat the bearing is kangarooted. "reliable diagnosis" is the
dificulty as I believe there is a necessary experence required to diagnose a problem wheel bearing. Best advice I can give is the wheel when jacked up
should spin perfectly smoothly and absolutely quiet with no noise, rumble or vibration. Also should have no play and no preload on the thrust washers
for front tapered rollers. IRS and swing rears can have a slight amount of play and still be ok, moreso with irs with the parellel roller being the
bigger culprit.
donn - July 27th, 2012 at 08:29 PM
Decided that for $30 it's not worth the chance, I don't have a gauge to measure the play so tightened it up and then backed it off till it spins
freely but no play, hope that works, should be alright for the Valla trip.
Thanks for the help fellas, as usual you have been tops.
h - July 27th, 2012 at 08:38 PM
Matty glad that doesn't include a blue car I know with wheels spinning perfectly 
psimitar - July 27th, 2012 at 09:37 PM
| Quote: |
Originally
posted by matberry
I don't agree with the 'plenty of heat' as a RELIABLE diagnosis. If there is heat the bearing is kangarooted. "reliable diagnosis" is the
dificulty as I believe there is a necessary experence required to diagnose a problem wheel bearing. Best advice I can give is the wheel when jacked up
should spin perfectly smoothly and absolutely quiet with no noise, rumble or vibration. Also should have no play and no preload on the thrust washers
for front tapered rollers. IRS and swing rears can have a slight amount of play and still be ok, moreso with irs with the parellel roller being the
bigger culprit.
|
Thats what I meant. Plenty of heat means the bearing is buggered. I presumed whoever read that would realise that a build up of heat means a serious
problem.
matberry - July 27th, 2012 at 10:03 PM
| Quote: |
Originally
posted by h
Matty glad that doesn't include a blue car I know with wheels spinning perfectly
|
That's all better now with a master cylinder replacement a little while ago, if that's what your suggesting h?
| Quote: |
Originally
posted by psimitar
Thats what I meant. Plenty of heat means the bearing is buggered. I presumed whoever read that would realise that a build up of heat means a serious
problem.
|
Fair enough, but also the brakes are going to influence the temperature in a big way and need to be taken into consideration
h - July 27th, 2012 at 11:13 PM
| Quote: |
Originally
posted by matberry
| Quote: | Originally
posted by h
Matty glad that doesn't include a blue car I know with wheels spinning perfectly
|
That's all better now with a master cylinder replacement a little while ago, if that's what your suggesting h?
|
erm no
front lhs spinning not so freely last thurs eve n we all pointed and went what tha
psimitar - July 27th, 2012 at 11:13 PM
| Quote: |
Originally
posted by matberry
| Quote: | Originally
posted by h
Matty glad that doesn't include a blue car I know with wheels spinning perfectly
|
That's all better now with a master cylinder replacement a little while ago, if that's what your suggesting h?
| Quote: | Originally
posted by psimitar
Thats what I meant. Plenty of heat means the bearing is buggered. I presumed whoever read that would realise that a build up of heat means a serious
problem.
|
Fair enough, but also the brakes are going to influence the temperature in a big way and need to be taken into consideration
|
True, but then maybe my experience lets me tell the difference between more localised heat from the bearing compared to latent heat from the brakes.
Lets just say that when I've heard a grumble and done the heat test it's far warmer than it should be from normal use of the brakes 
As you know, experience is hard to pass on via the internet 