NikTheGeek

NikTheGeek

New Member
I've had FL bearing replaced with new (it was an MOT failure), FR was given a clean bill of health and the 2 rears had advisories). I've replaced RL and RR with second hand ones with a warranty from Emmots (I thought they were worth a punt for the few quid they cost). But I can hear a bearing whine that I can't locate when driving. I haven't jacked up each wheel yet to test, but is there any reason I can't jack up all 4 wheels, put the car on axle stands, start it and put it in drive? Will it do any harm to have all 4 wheels spinning? I assume the traction control will be ok as they'll all spin at the same speed. I assume the VCU will be ok for the same reason. Will it break anything having them all run freely?

If my new bearing is knackered, it's under warranty. If either of the 2 S/H ones are dodgy, they are under warranty (but I'll replace with new) and if its not a bearing, at least I'll be able to try and ascertain where it's coming from.

tnx

Nik
 
It will be fine. I've done it a few times with difference vehicles. As far as the car is concerned it is driving.
 
Its fine just make sure its stable cos if it comes off at full boot in your drive it wont end well! also keep an eye on your temp cos if you fans not working and your engine is driving with no forced air cooling it wont take long to overheat!
 
Wtf buy yourself a £10 steathsscooe and listen to each hub individually for adverse noise propping up your car and spinning the wheels under no load won't tell you f all!
 
3.5 efi said:
so how does the mot guy fail a bearing?
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He raises a wheel and rocks it. Holding 3 and 9 push back and forth feeling for movement, then 12 and 6 pushing back and forth feeling for movement. If there is any movement if fails. Super simple test.
 
Grit Valve said:
The only way they been taught check for play ( excessive ) and roughness !

Not that can work on a p38 hub

Puts it this way they don't suspend it in four axel stands and rag the fooker!
Click to expand...

who said anything about ragging the fooker?
 
jamesmartin said:
checking by feel doesnt necessarily show up a noisy bearing
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Nor does putting all four wheels in the air and putting it in gear the traditional ways works best check for ( excessive play) or roughness .The ball bearings are that worn then they will show roughness in there sealed tracks
 
Grit Valve said:
Nor does putting all four wheels in the air and putting it in gear the traditional ways works best check for ( excessive play) or roughness .The ball bearings are that worn then they will show roughness in there sealed tracks
Click to expand...

no ,not often ,they will if you leave them long enough
 
Grit Valve said:
Excacly if there not worn enough to show then there non worth worrying about if he op wants go buy unknown malfeasance hubs that have sat about in a damp shed unmoved for for centurys then gl
Click to expand...

i wouldnt say that ,id change at first sign of noise not wait till it showed at hub
 
Bix said:
He raises a wheel and rocks it. Holding 3 and 9 push back and forth feeling for movement, then 12 and 6 pushing back and forth feeling for movement. If there is any movement if fails. Super simple test.
Click to expand...

I know my front left bering has had it and its on the to do list but there's still no play in it!
 
Bearing noise starts when minute parts of the bearing track start to degrade. On bearings of the type fitted to the P38 it will be some time before any roughness or play can be felt. Detect roughness on a live axle when you are also turning the diff planet wheels and the other wheel is almost impossible in the early stages of wear. If you can detect play the bearing has been knackered for a long time.
 
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