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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: 3dachshunds on September 30, 2025, 03:22:08 PM

Title: Steering bearing removal - bump on the stem
Post by: 3dachshunds on September 30, 2025, 03:22:08 PM

I am working on 1985 K100 which seems never spent a single day in a garage and possibly has not seen any service whatsoever… I took apart the bike and was going to replace headstock bearings today, which were completely seized. I finally dislodged remains of bottom bearing, but there is what appears a bump or bent lip on the stem, which prevents it from sliding off. Is this something done on purpose during assembly,
? Is it OK to grind it off to remove the bearing? In a separate question, when installing new races, do I need to heat head tube, or freeze race to facilitate installation? Or just whacking with mallet will suffice? Thank you.

Title: Re: Steering bearing removal - bump on the stem
Post by: Ingo on September 30, 2025, 04:59:00 PM

That slot is for the steering lock. Fine to grind off the bump. Put the stem in the freezer, heat up p the race, it'll slip right into place.
 Be fast with that.

Title: Re: Steering bearing removal - bump on the stem
Post by: bocutter Ed on October 01, 2025, 06:59:05 AM

Quote from: 3dachshunds on September 30, 2025, 03:22:08 PM

when installing new races, do I need to heat head tube, or freeze race to facilitate installation?

Ingo has it. What you were thinking will only make it tighter.