Topica Loopframe_Guzzi Archive


Subject: Re: Loctite on carrier bearings?

Author: Greg Field

Date: May 10, 2005, 11:10 AM

Post ID: 1718839734



I haven't got the u-j yet. Should today.

I actually did the test last week.

Found another bearing yesterday, and tried it again with blue loctite.
It stuck really well. It sets up really fast, in under 5 minutes. I had
to pound it out, but I was able to do so with a plastic dead-blow, and
it came out without need for heat or destroying the bearing. This was
after setting up for less than an hour (which is all the time I had),
so I don't know if the bond would become overly strong after longer
setting.

I'm pulling another carrier bearing out of a bike today, so I may try
it again, to see if time makes the bond too strong.

I actually believe that if you don't have to pound the u-j into the
carrier, it may last longer, since you're not side-shocking the carrier
and end-shocking the u-j bearings with hammer blows. Seems like when I
peen them, I have to pound them in, just as I have to with brand-new
parts. If the loctite gives a good enough bond between the slip-fit
parts to withstand the inertia of regular use, and is
"disassembleable," that's surely the way to go. In my opinion, the red
is not disassembleable. The blue seems to be.

So, the question remains, does the loctite hold in service? Have any of
you had occassion to disassemble a u-j/carrier that you had earlier
bonded with loctite? Did the loctite keep the u-j yoke from spinning in
the carrier, or did it give up the ghost in service? I've never had to
go back in to see if it worked.

If I had my druthers, I'd JB Weld the carrier to the U-joint while the
u-j and carrier are on the bench, so I'd be sure of a good bond. Then,
I'd slip them as a unit into the swingarm. This would require slightly
enlarging the swingarm's bearing tunnel for a slip-fit, so you don't
have to pound the u-j/carrier unit into the swingarm.

How then to fix the carrier in the swingarm (you could not install the
circlip)? Maybe loctite around the outside edge of the carrier, leaving
off the circlip? This might work because you usually have to heat the
swingarm to get them out anyway, so that would melt the loctite. The
only question is does the carrier get hot enough in running to also
melt the loctite? I'd bet not, but don't really know. I may try this on
one of my bikes.




On Tuesday, May 10, 2005, at 05:21 AM, John Chicoine wrote:

 Your free subscription is supported by today's sponsor:
-------------------------------------------------------------------
Help us support US Troops - Just Register Here.
http://click.topica.com/caadtaMb1dfltb6KFeCa/PermissionData
-------------------------------------------------------------------

Thanks for that input Greg.

I've got a carrier bearing that turns real nice, but the inner race is
blued. This tells me that the u joint will spin even in a good
bearing if
not tight in the inner race.

Perhaps a temp loctite is the way to go or some prick punch marks. My
goal
w/ my rebuilds is to put a ligh knurl on the u joint yoke. Just
enought to
make it grab. Now if I could only find my knurling tool I'd start
doing
it!!!!!!!

Did you get the u joint that I sent? Perhaps my advice is what
promted your
investigation.

John C.

----- Original Message -----
From: "Greg Field" <gre-@gregfield.com>
To: <Loopfram-@topica.com>
Sent: Monday, May 09, 2005 3:52 PM
Subject: Loctite on carrier bearings?


 Your free subscription is supported by today's sponsor:
-------------------------------------------------------------------
Get both the MiFi XM Satellite Radio and an Apple iPod for Free!
http://click.topica.com/caadtaJb1dfltbN7eKTa/ProductTestPanel
-------------------------------------------------------------------

I've been gluing u-joints to carrier bearings with red loctite for
some
time now, but after an experiment I did the other day with a ruined
u-j
and carrier, I wonder whether it's really a good idea.

I cleaned the parts well, goobered them up with loctite, and fitted
one
over the other. After letting it bond for a few hours, I tested the
strength of the joint by trying to twist and then pound them apart.
Just the two parts, not installed in the swingarm.

No dice, not even with my biggest hammer. To get them to separate, I
had to use the big hammer, lots of heat directly on the carrier race
and enough pounding that the entire carrier was broken to schrapnel.

There isn't a prayer that you'd get them apart if they were already
installed in the swingarm because you could not get heat directly to
the carrier-bearing race, and you'd pound the circlip right out of the
swingarm.

So, if the bond held through all the twisting forces of daily use, you
could never disassemble the u-joint and swingarm again, and if the
bond
didn't hold, what's the point of using loctite? Bad, either way. If I
had another trashed bearing, I'd try the blue loctite to see how tough
that is to disassemble.

GF

Your free subscription is supported by today's sponsor:
-------------------------------------------------------------------
Erase wrinkles without Botox!
Nexiderm SP is clinically proven to reduce wrinkles by 68%. Click
here to start looking younger today!
http://click.topica.com/caadslIb1dfltbN7eKTf/Nexiderm
-------------------------------------------------------------------

Your free subscription is supported by today's sponsor:
-------------------------------------------------------------------
Sign up today for a No Annual Fee Discover®Platinum Card and get�
0% Intro APR on Purchases & Balance Transfers for 8 Months, Up to
2% Cashback Bonus®reward on your purchases & 100% fraud
protection.
http://click.topica.com/caadtrVb1dfltb6KFeCf/DiscoverCard
-------------------------------------------------------------------

Entire thread: