Gemma_k said:"DeF" <""d.farrow\"@your finger.murdoch.edu.au"> wrote in message
news:[email hidden]...
Quoted message said:when the one I've ordered comes from OS. I'm a bit
surprised that the headset has worn out so quickly.
The horrid noise has gone but surely I'm not going
to have replace a headset every 18 months or so.
Getting the bracket of the top of the forks is going
to be a challenge.
Poor tensioning of the bearings greatly shortens the bearing life. Too
loose or too tight - either way is bad news. Same goes for head tubes where
the faces aren't exactly parallel.
The bottom race tends to go the first in my experience, usually because it
also suffers the most amount of [censored] getting in there sprayed up from the
front wheel, as well as any moisture and [censored] getting in from the top
bearing can run down the steerer and get into the bottom bearing. If it
didn't have much grease in there to begin with it starts life behind the
8-ball, especially if it's got a cartdrige bearing installed 'dry'.
Getting the cone off the top of the forks is easy if you want to throw away
the cone- hammer it off with a screwdriver, working your way around.
Getting the new one on is must more difficult, a special tool is important
to not damage the new one's face, and getting it to start on square.......
whacking it with a bit of tubular pipe isn't recommended :-)
Gemm
My guess is that the short life is partly due to poor tension
early in its life. I did have to tighten it up not long after
it was installed. There was certainly lots of road [censored] as well.
I didn't mention it in my original post but when I took the headset
apart, the race at the bottom had come apart. There are two races,
the balls and a hard, ridged plastic clip that snaps the whole thing
together. The plastic clip is a bit damaged. I cleaned it all up,
generous grease and put it back together with (hopefully!) all the
balls (may have lost one or two on the floor of the shed). Noise
has gone but the races have some pitting and headset feels "lumpy"
when rotated with wheel off the ground.
I've replaced threaded headsets before with no dramas and this one
doesn't seem much different. The only problem I'm anticipating is
getting the bearing support off the forks. The carbon forks are
nearly as wide as the support so there's not much room for getting
a drifter and a hammer in there. Much care to be taken methinks.
The new one I've ordered is this one: http://tinyurl.com/qhowf
In my mind, needle bearings should stand up to higher loads
than spherical bearings. Bit worried about alignment though.
I've probably got enough [censored] kicking around the shed to make
up any special stuff I might need.
DeF.
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