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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: RobP on May 20, 2015, 09:48:53 AM

Title: Stripped Thread Repair for Gas Cap Screws
Post by: RobP on May 20, 2015, 09:48:53 AM

A couple of the  gas cap retaining screw holes are stripped out on my tank. I have found thread repair kits for M4 course threads, but not the fine threads.  Has anyone had any luck drilling and re-tapping for M5 screws?  This approach would probably involve re-countersinking the holes in the cap assembly.   

Or another solution?

Title: Re: Stripped Thread Repair for Gas Cap Screws
Post by: Scott_ on May 20, 2015, 08:21:43 PM

Check with a local machine shop?
If they have/can tap M4 fine, the lip area of the tank is aluminum, possibly they could "fill" the stripped hole with aluminum filler and then re-tap the hole again.

Title: Re: Stripped Thread Repair for Gas Cap Screws
Post by: TimTyler on May 20, 2015, 09:29:51 PM

Or drill the hole all the way through and use a longer screw and a bolt?

Is that a bad idea?  :dunno

Title: Re: Stripped Thread Repair for Gas Cap Screws
Post by: RobP on May 20, 2015, 10:03:03 PM

I pulled out my tap set to re-confirm the thread size, and found that the threads appear to be M4 x .70, and was able to find thread repair inserts in that size.

I originally got bolluxed up when I read the parts fiche and the screws were listed as M4x10, but those appear to be the WxL dimensions, not the thread size.

Title: Re: Stripped Thread Repair for Gas Cap Screws
Post by: wmax351 on May 21, 2015, 01:14:50 PM

JB Weld may be your friend here.

I'd drill and tap larger to give the JB weld something to grip. Then fill with JB Weld, drill and tap. I wouldn't torque it fully, but it should hold pretty well.