shimano BB seals?
The question of what to use for seals when the ball and cone shimano BB
seals fail from mechanical ignorance received no response.
But a length of common 5/8" radiator or fuel hose flew into the
garage and this fits the sugino axle/spindle OD.
I cut the hose mounted on a snug ID fit copper pipe with a socket as
outer guide.
The width was cut oversized 3/16"?. Check the crank arms inner
surface for depression depth. The inner crank squeezes the hose just so
against the cup. Lube with waterproof silicone before mounting.
Cutting goes well with a serrated knife: saw with a slight rocking
motion.
The seals worked on the left side but not on the right. The right CR
side hose disintegrated. Reason for disintegration is unknown-does
valvo synthetic gear lube dissolve fuel or more likely rad hoses? Or
was the disappearance mechanical abrasion? Not much over flow from CR
to axle...?
The BB was repacked and adjusted twice after the hose seal and grease
cleanliness was good. Did castrol marine grease ease out and eat the
seal?
Tweak! The hose (and mil spec hoses or nuke hoses are desirabbble)can
be bearinged by cutting a plastic flat washer(doughnut) to fit over the
spindle for inboard and outboard sides getting pressed up against the
cup and/or crank if this shape is acceptable. Fine roundness and
accuracy of the sugino spindle/axle hole cut is not required-just flat
sealing here
Better! The left side rubber seal from shimano rear MTB hubs, cut with
forms as with the rad or fuel hose, slips over the hose assembly. When
dimensionally eyeballed adequately then squooze between crank and cup,
the MTB seal section diaphragms, seals over the hose.
is the MTB rear hub seal an available part?
On the hose, what are shimano seals made from? A hose from shimano seal
material is the ideal choice.