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LM! UJ carrier bearing question

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simonnorthroad View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote simonnorthroad Quote  Post ReplyReply Direct Link To This Post Topic: LM! UJ carrier bearing question
    Posted: 04 Apr 2018 at 12:28
Im about to buy and fit a UJ carrier bearing to my Le Mans 1 Swingarm.  Obv. there are a myriad of choices of bearing. Obv. Im going to buy the best quality I can find.

One option is metal or rubber sealed bearing. I wonder always how mean they have been with the grease in the factory

Im also considering leaving one seal in and prising the other out (easily done) ,fit the sealed end facing the rear of the bike, packing it with grease on fitting and leaving the side facing the engine open, so in future I can slide the rubber boot back and with a syringe or similar fill the UJ cavity with EP90 or thin grease. The intact seal would stop the lubricant migrating down the swing arm but the bearing would get an oiling due to the missing seal. Is this a good idea?
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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 04 Apr 2018 at 12:48
It seems perfectly reasonable to me.I have considered it myself but as yet have not done it.I suppose the downside would be the lubricant draining out of the bearing perhaps.

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simonnorthroad View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote simonnorthroad Quote  Post ReplyReply Direct Link To This Post Posted: 04 Apr 2018 at 12:56
Or the shrapnel going into the UJ when the bearing explodes as it did on an LM5 I used to own.....
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cyclobutch View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cyclobutch Quote  Post ReplyReply Direct Link To This Post Posted: 04 Apr 2018 at 13:00
There is in fact an optimal amount of grease loaded into a 2RS bearing, which I suppose could look 'mean' if you pop a seal for a look. I'd fit the rubber sealed bearing with them both left intact, as is.
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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 04 Apr 2018 at 13:03
Originally posted by simonnorthroad simonnorthroad wrote:

Or the shrapnel going into the UJ when the bearing explodes as it did on an LM5 I used to own.....

But did the bearing explode because it had dried out?

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jpc View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpc Quote  Post ReplyReply Direct Link To This Post Posted: 04 Apr 2018 at 13:17
The pulley bearings on car fan/accessories belts not infrequently start "singing", even when not very old.

On opening them you find they're bone dry, where'd the grease go ?

I never worried about the UJ bearing, until now Unhappy
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kateguy View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kateguy Quote  Post ReplyReply Direct Link To This Post Posted: 04 Apr 2018 at 18:25
I think grease is a dirty word on production lines.....
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jezguz Quote  Post ReplyReply Direct Link To This Post Posted: 04 Apr 2018 at 21:27
My first support bearing went at around 90,000 miles, dumped the clutch at a set of lights and it went bang, it came out in about 25 lumps, glad it went there and not 2 minutes earlier as I was exploring the performanceWink New one went in and I removed it when I had the frame powder coated,no more than 10,000 miles and its notchy. New bearing is a SKF bought at the right kind of priceThumbs Up
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 05 Apr 2018 at 09:20
I was always told to pack the bearing with grease then spin it a couple of times and remove the grade expelled. You would be surprised how little grease remains. Any more than that is wasted.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpc Quote  Post ReplyReply Direct Link To This Post Posted: 09 Apr 2018 at 17:25
I was doing the bevel & gearbox oil change today and it made me think that you don't want a sealed bearing for the UJ at all, because the bevel box depends on the gearbox breather to relieve pressure when it heats up. 
Moreover, oil passages are provided in the pinion bearing carrier to bring bevel box oil to the UJ bearing. A sealed bearing will just transfer pressure to the crown seal, not a good thing.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 10 Apr 2018 at 15:29
I would just keep it factory spec TBH.

The balls in the support bearing will outlast the inner race, which is worn out by the UJ end piece spinning inside it, originally they are a tight press fit, but ALWAYS become loose. Replacing with Loctite works for a while but will just go loose again, in bad cases the UJ spins in the support bearing inner race so that the bearing itself hardly turns at all. Eventually both will have to be replaced. Although rebuilding the needle rollers is often cited as an option, still not a complete answer as the same UJ end piece will still be a loose fit even in a new bearing.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote simonnorthroad Quote  Post ReplyReply Direct Link To This Post Posted: 12 Apr 2018 at 18:49
What is 'factory spec'? Sealed or unsealed?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote theoneandonly Quote  Post ReplyReply Direct Link To This Post Posted: 13 Apr 2018 at 18:50
sealed 
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