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Old 02-18-2013, 08:09 PM   #1
rbm OP
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How to seal threads on emblem screws

Hi,

I'm going to be modifying my BMW K75 tank to accept /5 tank emblems using screws rather than adhesive. This means drilling and tapping the aluminum. Will I need to use a sealant (such as Locktite 242 or RTV) to seal the threads when installing the badges, so that there is no possibility of fuel leakage later? Or is the rubber gasket between the badge and tank sufficient to stop leakage?

I had also contemplated using slightly longer screws with flanged nuts on the inside of the tank. Bad idea?

BTW, posting in this forum since it's more likely to have someone in the know read this than in another forum, like Road Warriors.
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Old 02-18-2013, 09:04 PM   #2
crazydrummerdude
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I have a hard time believing that this idea won't leak regardless of the sealant.
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Old 02-19-2013, 01:34 AM   #3
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Weld in an aluminum nutsert. You could also cut the heads off of the screws, JB Weld them in place and use 3M double sided tape to hold the emblems on.
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Old 02-19-2013, 05:03 AM   #4
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I second the "fake screw" idea. just glue the heads onto the emblems and use the tape to hold the emblem on, nobody gonna know!
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Old 02-19-2013, 06:45 AM   #5
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I wouldn't penetrate the wall of the tank if I were you. That seems like a losing proposition no matter how you seal it up again. I'd have someone weld or braze a blind threaded insert into the wall of the tank and screw them into that.

EDIT: Considering the difficulty involved in doing the above, the 'fake screw' and adhesive method mentioned earlier is what I would do.
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Airhead Wrangler screwed with this post 02-19-2013 at 07:43 AM
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Old 02-19-2013, 07:25 AM   #6
Bill Harris
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Quote:
Originally Posted by AW
I'd have someone weld or braze a blind threaded insert into the wall of the tank.
That is how the /5 (and earlier) tanks do it.

Quote:
Originally Posted by Euro
cut the heads off of the screws, JB Weld them in place and use 3M double sided tape to hold the emblems on
That is how I would do it.

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Old 02-19-2013, 08:25 AM   #7
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Originally Posted by bikerfish View Post
I second the "fake screw" idea. just glue the heads onto the emblems and use the tape to hold the emblem on, nobody gonna know!
plus 1,000,000+!!!!!
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Old 02-19-2013, 09:05 AM   #8
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Most folks here try and seal old tanks that have holes in them, here you want to go and make holes.............

Fake the screws, nobody will know, whereas if you drill the tank and it leaks it will show
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Old 02-19-2013, 07:53 PM   #9
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Well, good I asked. I got consensus on faking the screws and using double-sided tape so that's the way I'll tackle this modification. Thanks to everyone who responded.
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Old 02-19-2013, 07:54 PM   #10
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Go ahead admit it...you want a /5
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Old 02-19-2013, 11:36 PM   #11
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If I recall, the K bikes have a double wall tanks. In any case, cut off the heads, and glue it on.
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Old 02-20-2013, 12:57 PM   #12
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Originally Posted by wmax351 View Post
If I recall, the K bikes have a double wall tanks. In any case, cut off the heads, and glue it on.
Nope on the double walls.
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Old 02-21-2013, 01:16 AM   #13
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Nope on the double walls.
Good to know. I have a little dent from someone's handlebar I need to pop out.
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Old 02-21-2013, 06:09 PM   #14
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Go ahead admit it...you want a /5
Ya. Wouldn't mine in the least!!
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