Jenko
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| posted on 15/5/13 at 10:08 AM |
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Wheel bearings.....Movement?.
Had an interesting chat with a fellow J15 builder last night......
Seems we have both had a similar experience with standard ford wheel bearings in the J15 rear upright......
I had mine pressed in by our local garage....Everything seemed fine, but some months later (car not moved). I noticed play in the bearings on BOTH
sides!......I assumed they were shot, but it seems like other builders have had the same thing. When the drive shaft is tightened up through the hub
they appear to be solid with no play....Is this normal?.
opinions appreciated......
P.
MY BLOG - http://westfieldv8.blogspot.co.uk/
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ChrisJ15
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| posted on 15/5/13 at 10:26 AM |
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Mine were fine when pressed in but I found my wheel studs were too short and when I gently tapped (honest  ) them out I found I had a lot of play in
the bearing. I didnt repeat the mistake on the other side.
Bought new bearing and was already to get new one in but found when driveshaft was tightened the play went away.
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mark chandler
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| posted on 15/5/13 at 11:03 AM |
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Assuming they are the same bearings as you find in sierra rear uprights then they are tapered bearings but are set by the ridge in the hub so you do
not tighten to a low torque and back off just do them up hard, something like 150lb/ft
When first installed they will be tight, infact mine were binding but after a few miles they loosen up.
If the machined ridge was a little small then as the bearings wear in they will become loose so tighten up hard, when at 150lb/ft torque if they show
play when done this tightly its time to discard.
[Edited on 15/5/13 by mark chandler]
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Jenko
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| posted on 15/5/13 at 11:30 AM |
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There are actually the bearings from a mk4 fiesta front upright.....Needed many tonnes of hydraulic pressure to get them in and the hub is straight
not tapered......If that helps.
MY BLOG - http://westfieldv8.blogspot.co.uk/
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adithorp
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| posted on 15/5/13 at 11:41 AM |
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quote:
Originally posted by Jenko
Had an interesting chat with a fellow J15 builder last night......
Seems we have both had a similar experience with standard ford wheel bearings in the J15 rear upright......
I had mine pressed in by our local garage....Everything seemed fine, but some months later (car not moved). I noticed play in the bearings on BOTH
sides!......I assumed they were shot, but it seems like other builders have had the same thing. When the drive shaft is tightened up through the hub
they appear to be solid with no play....Is this normal?.
opinions appreciated......
P.
Are you saying you have play when the drive shaft isn't tight? If so, that normal for a fixed/cassett bearing. The shaft has to be tight.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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Jenko
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| posted on 15/5/13 at 12:03 PM |
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Thats exactly whats happening......there is play in the bearing while no drive shaft is inserted. So you can grab the hub amd move it, you can see the
inner race move while the outer race is wedged solid on the upright....
This sounds promising.....so you think you always see play?.
MY BLOG - http://westfieldv8.blogspot.co.uk/
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ian locostzx9rc2
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| posted on 15/5/13 at 12:21 PM |
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These bearings use the driveshaft to take the play out of them ,dont leave the car on the floor on the hubs if the driveshafts arent tightened up as
it will damage the bearings...
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Jenko
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| posted on 15/5/13 at 12:34 PM |
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HA.....Bad news is I just ( i.e. last week), wasted 30 quid on a new set of bearings....Good news is, I've not fitted them yet.
Imagine my disspleasure if I were to put some new ones in only to find them 'knackered'.....
Message for Chris.....I think we are in the clear :-)
Thanks all for your help.
MY BLOG - http://westfieldv8.blogspot.co.uk/
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Litemoth
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| posted on 15/5/13 at 12:37 PM |
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Without going into chapter and verse on fully, semi and 3/4 floating hub arrangements, suffice to say, YES, it is correct.
The hub nut pre-loads the two opposing tapered inner race/cage/roller assemblies by clamping the whole pack together. The inner race is completely
loose before assembly (It is the outer race that is pressed in by the press) and it's only the seals that hold the bearings together before you
clamp it all up.
The hub nuts should be wanged up (technical term) to the correct torque to ensure pre loading on the bearings. If this is done correctly, they
shouldn't need re-wanging down the line. Lots of cheap and nasty bearings out there though.
[Edited on 15/5/13 by Litemoth]
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ChrisJ15
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| posted on 15/5/13 at 12:56 PM |
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"These bearings use the driveshaft to take the play out of them ,dont leave the car on the floor on the hubs if the driveshafts arent tightened
up as it will damage the bearings..." - Possibly Not in my case Paul - Mines been sat on the floor without the driveshafts done up for ages!
[Edited on 15/5/13 by ChrisJ15]
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ChrisJ15
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| posted on 15/5/13 at 01:44 PM |
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I remember one reason why I didnt do the driveshafts up.
The driveshafts on the original car (ST150) had some strange nuts made with multiple layers of metal with an integral washer.
The bearings I bought came with a more conventional K nut but no washer.
Wasnt sure if the the K nut simply did up with no washer?
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