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914World.com _ 914World Garage _ Fresh Air Box Drain Nipple Repair - Simple

Posted by: jrmdir May 12 2022, 02:27 PM

Hi:

Something like this may have been posted before but I couldn't find anything. Posting in case it may be of help to someone down the line.

Based on my car it seems that the drain nipples are prone to snapping off. Someone mentioned trying ABS cement to try to butt weld them back on, but while I have my air box out I wanted to try something more durable.

Turns out a standard 1/2 copper coupling is almost a perfect fit to make a sleeve. The ID of the broken nipple is slightly tapered going toward the box so while the copper fitting slides in perfectly from the drain end, it sticks about 1/8 inch from the other end. But just a few minutes hogging out that end, as well as the opening in the box and it all came together perfectly. Now to add a bit of epoxy and it should be pretty reliable.

Ron

Posted by: autopro May 12 2022, 02:30 PM

Nice solution, wish I would have known before. I recently did this but just used epoxy to glue the broken piece back on. If after installation it breaks again then I will do as you did. Thanks for posting it!

Posted by: dlee6204 May 12 2022, 03:11 PM

I completed this exact repair recently. I used black some black epoxy, sanded smooth, and in the end you couldn't really tell it was cracked.

Posted by: Van B May 12 2022, 03:18 PM

Both of mine are broken and this is the repair I had in mind. But I plan to use Hysol and anodized aluminum tube.

Good to know about the taper!

Posted by: Van B May 12 2022, 03:28 PM

QUOTE(dlee6204 @ May 12 2022, 05:11 PM)

I completed this exact repair recently. I used black some black epoxy, sanded smooth, and in the end you couldn't really tell it was cracked.

I like the black epoxy idea. What brand and temp rating did you use?

Posted by: Root_Werks May 12 2022, 04:02 PM

Nice! Both mine drains were broken and I sourced another box. Didn't even think about a repair like this.

Well done.

Posted by: MM1 May 13 2022, 12:38 AM

Good idea-thanks for sharing.

Posted by: barefoot May 13 2022, 06:35 AM

I also did this same repair using epoxy as glue, works just fine.

Barefoot

Posted by: StarBear May 13 2022, 06:46 AM

Neat! Have never checked or noticed if mine are broken. Might investigate.

Posted by: Van B May 13 2022, 09:05 AM

Both of mine snapped off like glass when I pulled my tank. It's unlikely yours are broken if they've never been disturbed.