Broken chain guard post repair

[CB2NR]

Received a CB175 case which had a broken post. Mostly likely happened when the chain was too loose or let go. I’ve also seen this break when the case is accidentally dropped.

First the case was machined smooth. Measurements were taken, and a new post made. I chose to thread the post into the case via a 6mm x 1.0 stud. The stud is sealed with red Loctite, and threaded firmly into place. Welding the post is another option.

Save thoses cases

Photo after repair.

[ancientdad]

Very nice repair. Even though the work is fairly obvious, a few pics of the steps along the way for the lesser-knowledgeable among us would be great if you have them.

[LongDistanceRider]

Good idea and execution.

[CB2NR]

Very nice repair. Even though the work is fairly obvious, a few pics of the steps along the way for the lesser-knowledgeable among us would be great if you have them.

Thanks guys.

Could only find two other photos. The first show the machined spot, the other with case half held in place.

Once the area was cleaned up, the chain guard cover was installed, and an appropriately sized center punch was used to locate where the threaded stud would be installed. The other measurement was taken to know how long to make the new piece. Both ends of the new piece was drilled & threaded to 6mm x 1.0.

[ancientdad]

Thanks for adding them. Not everyone will have the tools to work with that you do, but the plan will still work the same way.

[Richard Pitman]

I made a much less elegant repair using a piece of aluminium bar and JB Weld. Against all odds, this repair has lasted several years.

Bar cut exactly to length, drilled and tapped to take sprocket cover screw. By attaching it to outer cover, this ensured exact alignment by using the other two screws to attach cover to case whilst JB Weld cured.

[CB2NR]

Nice work, Richard. Always good to have options.