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> Rear Wheel Bearing wobble, New rear wheel bearing has unusual play
MarkV
post Nov 13 2017, 03:57 PM
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I found the old thread:

http://www.914world.com/bbs2/index.php?showtopic=284907

The part # on the loose FAG bearing that I had was 545495AWD. Made in Slovakia. I took it apart after I replaced it and couldn't see what was wrong with it. It seemed like the two halves of the inner race would meet before they were tight to the bearings.
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jim_hoyland
post Nov 13 2017, 04:14 PM
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QUOTE(colingreene @ Nov 13 2017, 12:59 PM) *

Jim its a sealed bearing, i dont think you can re grease it.


That was my impression too; but, see:
https://www.youtube.com/watch?v=-A5kf5pXl4w
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mepstein
post Nov 13 2017, 05:33 PM
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QUOTE(jim_hoyland @ Nov 13 2017, 05:14 PM) *

QUOTE(colingreene @ Nov 13 2017, 12:59 PM) *

Jim its a sealed bearing, i dont think you can re grease it.


That was my impression too; but, see:
https://www.youtube.com/watch?v=-A5kf5pXl4w

Sealed bearings are usually a press fit bearing that is self contained vs loose bearings that use a cup and cone. Many sealed bearings have an easily removable plastic seal that lets you get to the bearings. Sealed doesn’t always mean non serviceable.
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euro911
post Nov 13 2017, 08:41 PM
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Wow (IMG:style_emoticons/default/yikes.gif)

Good to know that new ones need special attention and are 'serviceable'. The '71 has been rolled around extensively since the axle shafts were pulled out, but I was planning to replace the old bearings anyway. Just didn't know new ones were coming out of the factory with a built-in defect (IMG:style_emoticons/default/mad.gif)

Has anybody chided their QC department?
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mepstein
post Nov 14 2017, 07:07 AM
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Here's my theory on why the boxster guys have trouble with the bearings while most of us do not. I think the brand new bearings are filled with a bead of grease from a machine instead of having grease worked into the bearing retainer. The boxster spec cars are getting used on the track. So the guys take out there cars and immediately start driving some hot laps. This sudden increase in speed doesn't give the bearing much chance to warm up slowly so the grease can soften and flow to the bearings. So for at least a while, there is hot metal on metal. The bearing gets trashed before it ever has time to get lubricated. Most non track cars would be driven slowly for a while and the grease has time to warm up and flow around the bearing before any one part gets too hot.
The boxster guys are not modifying the bearings, just making sure they are completely lubricated.

just a theory...
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paintguru
post Nov 14 2017, 11:41 AM
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QUOTE(ThePaintedMan @ Nov 13 2017, 06:34 AM) *

The double row bearings are very difficult to over-torque. In fact, they rely on a great amount of torque to seat the balls and extend the life of the bearing. Went through 3 of them on a client's racecar till he trusted me that 100 ft lbs wasn't enough (IMG:style_emoticons/default/rolleyes.gif)

I'd be willing to bet that once you torque to 217+ ft-lbs, you'll see the slop disappear,

I'll do this. The bearing is an FAG unit.
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paintguru
post Nov 14 2017, 11:43 AM
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Thanks for all the help. I'll torque on it today and let you know what happens.
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porschetub
post Nov 20 2017, 03:44 PM
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QUOTE(paintguru @ Nov 15 2017, 06:43 AM) *

Thanks for all the help. I'll torque on it today and let you know what happens.

Hi ,did you have a good result after torqueing your bearing?,I would like to know and I'am sure others would (IMG:style_emoticons/default/beer.gif) .
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