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| Front wheel bearing service!!!! http://ducatipaso.org/forum/viewtopic.php?f=2&t=2547 |
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| Author: | JWilliam [ Mon Jun 16, 2008 12:22 pm ] |
| Post subject: | Front wheel bearing service!!!! |
I heard a rumour about this a few months ago and tried it out this weekend. You can remove the dust seal for the front wheel bearing to clean and repack them with grease. Owing to the awkward removal procedure for worn front bearings this should fill the average Paso owner with joy! Using a small flat blade screwdriver, ease this in from the centre of the seal and flip out the dust seal. When finished use a rubber mallet to flatten the seal because it will probably distort its shape and push back in by hand. (Apologies for the non-standard brake disc) |
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| Author: | enzo906 [ Mon Jul 07, 2008 2:20 am ] |
| Post subject: | Re: Front wheel bearing service!!!! |
Replacing the bearings is one of the easiest jobs to do on a paso. Chock the frame remove the wheel Use a old scredriver or if you have one a drift and knock the te old ones out. Tap the new ones in using a socket so as to only contact the outside of the bearing that's it I did it recently as the left bearings always need replacing due to the poor seal. If you remove the seal and repack you may be hiding the fact that the bearing is past it's best. |
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| Author: | Desmo_Demon [ Tue Jul 08, 2008 12:59 pm ] |
| Post subject: | Re: Front wheel bearing service!!!! |
| Author: | JWilliam [ Wed Jul 09, 2008 12:16 pm ] |
| Post subject: | Re: Front wheel bearing service!!!! |
| Author: | jomo [ Wed Jul 09, 2008 1:09 pm ] |
| Post subject: | Re: Front wheel bearing service!!!! |
It has been a few years now, but from memory, I heated the rim slightly. I hope I am not thinking of another bike. Terribly sorry if I am wrong  I sometimes help friends with their bikes, drink too much, play too hard, and after all that....the memory can drift.I'll have to do a bearing check now!!!! Well not right now! |
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| Author: | Laddie907 [ Thu Jul 10, 2008 2:06 pm ] |
| Post subject: | Re: Front wheel bearing service!!!! |
the rubber seal bearings are commonly known as RS or 2RS bearings (RS for single shield and 2RS for double). The 2RS deep groove ball bearings are common in bike wheels and RS type in automotive gearboxes. The amount of lube [base grease] is controlled so it doesn't piss out during operation. Also the type of grease used to fill them is lube-oil stable (usually an EP grease) so the lubricant oil doesn't weep out from the grease base. I work in the conveyor industry; we don't commonly use RS type bearings because the roller RPM is too high and the contact seal has high drag. The rubber contact type seals burn out and become ineffective after a short time...but this is thousands of hours doing 24/7 operation. The seal drag is not a problem on a bike wheel because the drag is minimal compared to the power and the hours for seal life very low..comparatively... Picking the seal out isn't a great idea; you need to ensure the lip contacts perfectly when you re-seat it. Otherwise it will not really seal well. This will mainly be a problem in areas with very fine dust or high moisture (riding in the wet). Most greases have a "life" of about 7 to 10 years...then the performance drops off. This doesn't mean it doesn't work any more - just not as well as new lube. A bike wheel is not a very demanding application so the life can be very high. The main cause of problems for bike wheel bearing failure is contamination and corrosion; very rarely over-loading. to re-grease or not to re-grease that is the question.... If you're going to replace the grease you need to get the old stuff out. Why? Well, if the old grease is OK why change it in the first place? No use leaving the old stuff in if it is contaminated or crappy. No easy answer to this one; re-greasing is OK...so long as you don't push contaminants in. Excess grease will pump out in operation / rotation. In reality, if the lubricant had failed, discoloured or needed replacing the bearing may be on the way out...if the grease is brown I'd replace the bearing - it is probably fretting corrosion - the brown is tiny metal particles that have rusted. Bearings often suffer internal corrosion from galvanic current from dissimilar metals...like a magnesium rim and a steel shaft - the bearing is the bunny in the middle that cops the current (albeit very low). The problem with these tiny bearings is you can't really inspect the bearing for serviceability until it's stuffed. you certainly can't inspect the bearing while it's in the rim because the outer race is pre-loaded with pressure from the rim - so any clearance is already taken up. [This is why the bearing is so hard to push out, by the way]. Because the wheel is a large diameter compared to the spindle the bearing can be quite bad but still rotate because of the leverage; you can find that what was easy to spin with the wheel won't turn in your fingers. Rotate the bearing with your finger tip, try to feel for any "notchiness" or tight spots. If any irregularity is present I'd advise to change it (them) and be done with it. The bearings are comparitively cheap; compared to a road-side stop and associated crapping around. I'd be inclined to replace the bearing if at all suspected of being failing - just to be sure, but if it ain't broke - don't fix it. If you need to replace the bearing make or use a proper puller. These are magnesium rims - I'm sure i don't need to tell you they are easily damaged and #$%^&*ing expensive. Yes, it will be a pain in the ass and expensive for the DIY handyman. Using a drift is OK only if you push the bearing out square to the axis; a screwdriver is not recommended. |
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| Author: | JWilliam [ Thu Jul 10, 2008 5:52 pm ] |
| Post subject: | Re: Front wheel bearing service!!!! |
I admit that a grease repack for a bearing is far from ideal, but when we look at the quirky design of the front wheel spacer I dont think I can be blamed for wanting to squeeze a few more miles from those bearings. |
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| Author: | ducapaso [ Fri Jul 11, 2008 5:37 am ] |
| Post subject: | Re: Front wheel bearing service!!!! |
| Author: | enzo906 [ Wed Jul 16, 2008 11:15 am ] |
| Post subject: | Re: Front wheel bearing service!!!! |
I stand by my comment that it is easy to do, no special tools were used. I don't use a pressure washer so my spacer and bearings still looked like new after 50,000kms. I replaced them as the left is not protected from the elements by the speedo drive and was showing signs of getting tight. The bearings (if originals etc) are a size for size fit. Not interference so they only need to be tapped out with a drift or screw driver. If there is oxidation of the rim and rust on the bearing and spacer then you can use some heat but I wouldn't use much as the alloy of the wheel will expand with little heat, thus releasing the bearing. To replace was simple as well, so I don't understand what the issue is? You can hammer away at the old ones to remove them as their trash anyway, you could probably knock it out using a socket!. The new ones tap in with a nylon mallet ( a piece of wood on the outer rim only will do in a pinch). I used a pin punch to ensure they were seated correctly. Granted there is a spacer involved but this was way easier than some of the dirt bikes I have owned. Either way hard or easy, regreasing went out with the old ball bearing cup and cone steering heads on Ducati singles. |
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| Author: | Desmo_Demon [ Wed Jul 16, 2008 12:16 pm ] |
| Post subject: | Re: Front wheel bearing service!!!! |
| Author: | Laddie907 [ Fri Jul 18, 2008 4:43 am ] |
| Post subject: | Re: Front wheel bearing service!!!! |
...another 2 cents worth. I admit I'm an arm-chair expert because: I haven't done the job on a 906 so I'm working on theory...and I own a 907 with 20mm axle the way I see it there are 2 "safe" options for the home mechanic: option 1: get a long 5/8" UNF bolt, nut and flat washer, grind the bolt head to 19.8 diameter - so it fits up and through the bore of the stepped spacer except the bolt head. you need to make a pulling cap that is larger than the bearing OD (42mm) - a large 1 inch drive socket is good ensure the bolt head isn't catching on the bearing bore...just the spacer drawbacks: 1) some risk of damage to the spacer if the bearing is ultra-tight 2) this method will only get one bearing out option 2: if you're going to pull the bearing(s) out you might as well destroy it (them). it will make the whole job a lot easier - particularly if you're worried about damaging the stepped spacer. all you need to do is drill the cage (spacer) that holds the bearing balls, then pull the cage out. once the cage is removed push ALL the balls to one side of the bearing in the race groove. the inner race will then move to one side. because the stepped spacer is through both bearings you need to take the balls out of both at the same time the balls come out easily, then the inner races can be removed...leaving the outer race in the hub bore. the stepped spacer should be able to be removed now. the outer race should be pulled with an appropriate puller...but if it taps out easily go for it.. |
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| Author: | JWilliam [ Wed Jul 23, 2008 4:48 pm ] |
| Post subject: | Re: Front wheel bearing service!!!! |
Well I have ridden the machine for a few miles now since trying the grease repack and am happy to report no mishap. No grease out of the bearing seals, just its usual predictable self. When I do have to replace the bearings I expect I will have a new front axle bolt and bearing spacer made to eliminate the problem but that is a year or two away. Had to do that for the steering head nut but thats another story. |
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