The spares company show an alloy type for a Comet, I think it's the same for a " C" Twin.Was the idler bush aluminium?
I think you just have to make sure more clearance and more end float.
The spares company show an alloy type for a Comet, I think it's the same for a " C" Twin.Was the idler bush aluminium?
The breather sleeve is aluminium while the spindle it is on is steel. Aluminium expands at around twice the rate of steel so if there is insufficient end float it WILL seize. Happened to me. To ensure it does not happen set it up with at least 0.015" end float. See MPH 852,page 23, point 1.The spares company show an alloy type for a Comet, I think it's the same for a " C" Twin.
I think you just have to make sure more clearance and more end float.
Yes, it is the expansion of the aluminium that I am wary of. It wasnt longitudinal expansion that caused mine to bite, I believe it was simply a lack of diametral clearance in the area where it was an interference in the pinion.The breather sleeve is aluminium while the spindle it is on is steel. Aluminium expands at around twice the rate of steel so if there is insufficient end float it WILL seize. Happened to me. To ensure it does not happen set it up with at least 0.015" end float. See MPH 852,page 23, point 1.
Like to take the credit - but it was an eagle eyed forum admin that made the fix.I just hate it when aluminum expands at twice the rate of --- well ---- aluminum.
Never read the contents just the grammar and the logic! Once a proof reader is a habit hard to break....
No bronze i would say.Was the idler bush aluminium?
Cyborg, your cases were probably left on the shelf due to the bearing bores being under size, any more than 0.0015" interference and the bearings will be too tight. I would be taking your time and double checking everything. If the outer races on the timing side are too tight, the inner races will either not fit or be too tight. The small race can be honed out quite easily to fix this, but the larger inner will spell the end for that bearing, as removal will most likely destroy it. Do not over heat the cases, an actual 200 deg Celsius is too hot, the metal will start to become annealed, about 170 to 180 max. Remember to install the small outer first, then the oil pump sleeve, inner large race last. Good luck with it.