Coasting with the engine off: was I doing harm?

SLOVFR · Aug 26, 2010

down hill coasting competition are the cats meow...although Regi likes to cheat!

Jakobi · Aug 26, 2010

TheUnnamed11 said: ↑

i guess i have more to learn about torque converters/
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Apparently you're not the only one. That's okay. Manuals are still better.

-Jake

digitallyhip · Aug 26, 2010

Lgn001 said: ↑

The 6th gen shop manual shows "oil jets" that I assume spray oil in a "blanketing" fashion for the gear teeth, shift drum and shift forks. I also remember that my old CB450 ('74?) had oil passages to the mainshaft and countershaft bearings, as does the CB1100F. Where I'm ultimately going with this is that I personally would not coast for very long, even in neutral, without the engine idling. Most, if not all, bearings in manual transmissions are ball or roller, so they don't need nearly as much oil as engine plain bearings (crankshaft and rods). But they do need a constant oil supply to stay healthy while they are rotating. I would think that an occasional short coast with the engine off would be tolerable, but once a rolling bearing element is damaged, it goes downhill pretty quickly. The localized bearing damage is bad enough, but what makes it worse are all the little bits of metal that start finding their way in between gear teeth, which load the bearings even more, which accelerate the wearing process, etc.

I would counter the above, to some degree, by stating that modern lubricants and metals are incredibly resilient compared to what was commonplace 20 years ago. Odds are that your transmission is fine, especially if there are no funny noises or other noticeable problems. I just like to err on the side of caution.
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Thank you!

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