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Rubber O-Rings on FSA MegaExo Cranks
On Oct 19, 8:15*pm, David White wrote:
wrote: On Oct 19, 5:35 pm, Doug Taylor wrote: On Sat, 18 Oct 2008 17:22:38 -0700, David White wrote: Again, I am installing these for a friend. The stuff he sent includes 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? Check out the "Megaexo FAQ" from the FSA website: http://www.fullspeedahead.com/fly.as...=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. any part requiring locite as part of installation is poorly designed. incidently, *is 641 the blue suff or the red ? 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.- Hide quoted text - - 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. |
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