Quote:
Originally Posted by
RickM
I can only put the whole thing down to a series of unfortunate circumstances: condensation in engine (hot engine/cold garage at night) and not getting the engine to warm up quick enough in the morning due to taking too long to allow the oil to distribute before opening up the throttle and/or constantly trying to max out on fuel efficiency by chuffing along in highish gear on barely open throttle - for most of it's 91,000 miles.
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Just something else to throw in the mix, but sadly isn't really help you... Since fitting a water temperature gauge to my Z, I've noticed that bimbling around in high gears up to 4K revs the engine barely gets warm enough to open the thermostat even through the summer and on longish rides. Spirited riding (not thrashing) seems to maintain "normal" engine temperatures. Needless to say I am now much more careful about engine warm-up times now because I know what's going on.
Cold running is a possible cause of you woes, not so much from condensation but from acid oxide build ups in the oil over time, which have different corrosive effects on different bearing materials. Could explain why only one bearing is affected?