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Question about bottom bracket bearing preload on Shimano Hollowtech II cranks
Honestly, I see a lot of shops and home mechanics crank down the plastic preload cap way too tight, like they're trying to torque it to 10 Nm. Ngl, that just mashes the bearings and kills them fast. I learned the right way at a Park Tool class in Minneapolis, where they stressed it's just finger-tight plus a tiny nudge to remove play. How do you guys explain this step to customers without making it sound too simple?
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ruby6596mo ago
Wait, they actually torque it to 10 Nm?
8
nathan_palmer6mo ago
Reminds me of a buddy who rebuilt his carburetor. He torqued every tiny bolt with a fancy inch-pound wrench. The thing ran like a dream for a week, then a fuel line clamp he just hand-tightened shook loose. Sometimes the spec is there for a reason, even on the small stuff.
4
brooket434mo ago
Hand tight is usually fine if you know what you're doing and check it later.
1
olivia_lopez986mo ago
Yeah, 10 Nm is a real spec. I learned that the hard way like your buddy, ruby659. I once just cranked on something and stripped the threads.
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