Rubber O-Rings on FSA MegaExo Cranks
David White
only a single, blue rubber o-ring that is installed on the right arm.
The instructions say that there should be another for the left side. I
don't have it. My buddy says the only one is needed and the one I have
should be installed on the left side. But...
Also, I see an install update on the FSA site that says some form of
loctite (yellow, I think - not an adhesive) should be put on the left
side splines instead of the grease called-for in the instructions I
have. Of course, I don't have this either. How important is this?
Thanks
d...@boomerbicycle.ca
Well, FSA seems to think it's vital. It's Loctite number 641 if I
recall correctly.
Qui si parla Campagnolo
The two teeny o-rings are pretty essential, one on each side. BUT put
the one on the RH side, install and torque and see if the setup has no
play. If it doesn't, go with it. Be sure you prep the frame as these
bearings aren't the most robust in the world.
We use a sleeve retainer(purple)as the included yellow uberloctite
that comes with these when new lasts for only one or two
installations.. Rather than change the design, they added loctite to
keep the LH crank arm on.
Doug Taylor
Check out the "Megaexo FAQ" from the FSA website:
http://www.fullspeedahead.com/fly.aspx?layout=tech&taxid=74
Q: I am missing one of the two small rubber O-Rings that fits over
the BB spindle as shown in the diagram in the installation
instructions.
A: Take a closer look. One of the O-Rings usually comes pre-installed
on the on the drive side arm.
Q: What are the small rubber O-Rings for on my Mega Exo crankset/BB?
A: Our Mega Exo crank/BB system utilizes two small washers that fit
over the bottom bracket spindle and sit between the crankarms and the
outer bearing face of the Mega Exo bottom bracket. There is one for
each crankarm. There are several reasons for these washers, which
include the reduction of noise as well as achieving correct bearing
adjustment. Until December of 2004 FSA used a solid rubber O-Ring.
Starting in approx December of 2004 we started to use a rubber coated
metal washer/O-Ring. When using the new rubber coated metal washer the
‘metal side’ of the washer should face the crankarm. If necessary to
achieve correct bearing adjustment you may use two of these washers on
the left crankarm. When using two washers, they should be oriented
metal side to rubber side.
Note: I had to purchase as second O-ring to keep my bearings from
binding.
As far as the locktite, it is Locktite 641, and yeah, you should use
it to insure you have a tight fit with these poorly designed cranks.
And like me and others, don't buy FSA cranks next time. I installed
Truvativ (SRAM) Stylo cranks on my 2 mountain bikes (single speed and
geared) with zero problems with bearings binding or loose cranks.
raa...@gmail.com
> On Sat, 18 Oct 2008 17:22:38 -0700, David White
>
any part requiring locite as part of installation is poorly designed.
incidently, is 641 the blue suff or the red ?
David White
According to the FAQ, it is yellow. Here is the complete Q and A:
What is that yellow liquid that came with my cranks?
Some crank models—nearly all of the carbon cranks, as well as stoker
tandem cranks—require the use of an assembly compound. This compound is
made by Loctite. It is called Loctite 641 retaining compound. Do not
confuse 641 with more common threadlockers. It is designed to be applied
to the splines of the crank spindle and the left arm spindle . It
hardens after assembly to fill the micro-gaps that are needed to
allow the two parts to press together. Loctite 641 is not an adhesive
and does not affect the disassembly procedure for your crank.
raa...@gmail.com
>
> - Show quoted text -
thanx, my curiosity got the better of me and I looked it up. I did not
realize it was a cf crank.