Uj and locktight |
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chrisshrops
Senior Member Joined: 23 Jan 2016 Location: shrewsbury Status: Offline Points: 139 |
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Posted: 22 Mar 2018 at 22:37 |
Hi folks I’m on the big rebuild at the mo,any merit putting locktight between the carrier bearing and the UJ ? Next question the uj is effectively dry ,do you grease it up before you assemble ? Sorry for the basic questions this is my first guzzi build
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JayDee24ca
Falcone Joined: 26 Sep 2017 Location: Grand Forks Status: Offline Points: 32 |
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If you have a good snug fit, (as in a little tighter than a mere friction fit), I would not bother with any dope. Just leave it metal to metal.
If the ujoint in a bit sloppy, you can lightly dimple the front and rear faces of the inner race of the carrier bearing to try to get a tighter fit. Along with that, some people have had success in using Loctite that is specifically designed for bearing fitting. Regular Loctite is likely to be ineffective, in my thoughts.
John D. |
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74 Eldorado
74 Nuovo Falcone Militaire 79 G5 79 Convert 87 SPII 00 Quota 1100 |
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jpc
Senior Member Joined: 06 Oct 2016 Location: Belgium Status: Offline Points: 651 |
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As long as the UJ remains on the swingarm when you pull the latter off the frame you should be fine.
Not sure what JD means by "dimpling" the bearing race, but don't try hitting it with a punch ! Externally greasing the UJ, plaster on a wooden leg as the bearings are sealed, think of driveshaft UJs on 4 x 4s, construction trucks... Good luck with the rebuild, what model ? |
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cyclobutch
Senior Member Joined: 08 Sep 2015 Location: Essex Branch Status: Offline Points: 750 |
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On ones that I have found to be loose, I've always cleaned carefully with meths and loctited. No idea if it did any good. I've never found a UJ that was spinning so badly in the carrier bearing inner that it was in any way destructive.
I find that for reassembly I have the best luck putting the UJ up on the g/box output shaft and then offering up the s/arm to it. So I don't like the UJ too tight in that bearing. I'd try practicing that a few times first as dry runs. I consider it a hateful job.
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Butch
V50 II - 'The Black Pearl' T3 - 'Blue' Eldo Loop - 'Jug' |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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Worth trying to get some grease into the U/J if you can.
I still have a big Duckhams tin of chain grease, the type you used to melt then drop the chain in. I warm it up and warm the UJ, rotate it to make sure it's covered then leave it to cool. Hopefully the cooling process (air contracting) will pull some grease into the cups.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Drumnagorrach
Senior Member Joined: 20 Dec 2016 Location: North east Scot Status: Offline Points: 98 |
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Locktite bearing fit will do just what the name implies , I used it quit a bit before I retired from being a maintenance engineer . If the bearing outer isn't an interference fit due to the old one failing and spinning in the housing ,providing the bore is within ,say .5 mm of original and not badly scuffed ,then bearing fit will work fine . there is even a product for dissolving locktite although heating up to just over boiling point does the same .
I found that the rubber boots within the u/j spiders can be gently eased open and grease forced in . On my first T3 I found my u/j s goosed when I took the gearbox of for a clutch change ,I had been given a box of Guzzi bits by an old boy who had sold his bike ,in the box was a u/j ( cardon shaft , two u/j s set at 90 deg to even out cyclic variation ),from the two I built one good one and greased upon assembly worked fine . The bearing housing wasn't tight on that so that was fitted with Loctite . Incidentally ,a leaking gearbox output seal prolongs the u/j life . Something that puzzled me is that Beemer R series certainly up to series seven only have one u/j ,are Guzzi's over engineered ? |
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Drumnagorrach
Senior Member Joined: 20 Dec 2016 Location: North east Scot Status: Offline Points: 98 |
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Dimpling is carried out by making an even pattern of centre punch marks on the surface of either id or od to raise the surface ,a bit like an impact crater where the displaced materiel from the hole forms a raised rim around it . sort of thing you did when you cocked up on the lath and bored something oversize . Very time consuming and impossible on small dia bores . |
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jpc
Senior Member Joined: 06 Oct 2016 Location: Belgium Status: Offline Points: 651 |
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It's what I imagined JD was hinting at, but am I wrong thinking it's a bad idea on hardened, brittle steel such as used for bearing races ? Risks of cracking... (?)
And didn't BMW go straight from "flexiblocks" on singles to double-jointed UJs ? Edited by jpc - 23 Mar 2018 at 16:52 |
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iansoady
Senior Member Joined: 23 Jul 2017 Location: Redditch Status: Offline Points: 2402 |
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You can't dimple or knurl (the other bodge) hardened steel.
I'd use Loctite but not one of the extreme ones as they can be impossible to part again..... |
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Ian
1952 Norton ES2 1986 Honda XBR500 1958-ish Greeves/Triumph in progress |
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jpc
Senior Member Joined: 06 Oct 2016 Location: Belgium Status: Offline Points: 651 |
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Thanks, just making sure ...
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chrisshrops
Senior Member Joined: 23 Jan 2016 Location: shrewsbury Status: Offline Points: 139 |
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Cheers Chaps
It was a nice firm fit so I have just put it together. The uj spins in the bearing so hopefully it will be grand . It’s my mk v lemans build the Engine and gearbox are done ,the frame has been powder coated so I will crack on |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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The support bearing to UJ interface always works loose. Consider, it has to be hammered in when new.
A loose one can be replaced with locktite, but will come loose again. Proper fix is new bearing and new UJ. HTH |
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"Chicken nuggets don't dance on a Tuesday."
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chrisshrops
Senior Member Joined: 23 Jan 2016 Location: shrewsbury Status: Offline Points: 139 |
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Hi Mike
Thanks for that , they are both new and seem a nice tight fit so fingers crossed
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