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Author Topic: Silencer heat shield hardware strangeness  (Read 775 times)

mattsz

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Silencer heat shield hardware strangeness
« on: October 08, 2012, 07:38:43 PM »
I started my bike today and heard a faint clattering sound - quickly chased it to the shield on the silencer.  One of the three hex-head screws securing it was gone.  I went to the hardware store with allen wrench in hand (pocket, actually), and removed a second screw to find a match.  It came out with little difficulty, with threads slightly surface-rusty but otherwise intact.  The shortest replacement I could find was just a hair longer than the original.

I put both back on the bike (they both went on fairly easily), and sure enough, the longer screw bottomed out just before the head clamped down on the shield.  I thought I'd grab a washer to fill the gap, but...  darned if I could get either screw back out again.  After I got home, I waited for things to cool down a bit, then went after both screws with penetrating oil, all the while thinking I was going to strip the hex socket or break the tool (not likely to break the head off the 6mm screw).  I eventually got them both out, with threads intact,  but what the heck is going on here?  I was going to lock-tite them, but now everything is saturated with penetrating oil.  Anyway, I don't see how they would have come out on their own as tight as they were.

Ideas?

Will residual penetrating oil bother blue lock-tite?  Will blue lock-tite work at all with the heat of the exhaust?

Ducati Scotty

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Re: Silencer heat shield hardware strangeness
« Reply #1 on: October 08, 2012, 07:46:24 PM »
Heat promotes oxidation.  Thing that get hot rust faster, simple as that.

I threw those silly little allen head screws away the first time I got them out.  I replaced them with standard hex head bolts in stainless steel.  I had to cut them down a bit but that was easy enough with a Dremel.  Now when I need to take them out past the accumulated rust I know I can get enough torque to do it.

The residual oil will block Loc-Tite.  Just use some solvent and a Qtip to clean them out.  At those temps no LocTite is going to hold BUT it will fill the gap with it's plasticky-ness and help prevent more rust.

Scott

barenekd

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Re: Silencer heat shield hardware strangeness
« Reply #2 on: October 08, 2012, 07:59:07 PM »
The Loctite will work, but a better plan is to get a different muffler. I had the same problem with my stock muffler the day I picked it up. I heard the rattling but kinda dismissed it, and a few weeks later, got an EFI muffler and when removing the bazooka, found the heat shield screws loose.
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mattsz

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Re: Silencer heat shield hardware strangeness
« Reply #3 on: October 08, 2012, 08:07:10 PM »
My Boys!!!   ;D

Thanks guys!  I think I would like to replace the bazooka with an EFI, but I don't want the bike to be any louder.  Anyway, that will probably be next season's "project".

Solvent: Alcohol?  Acetone?  Mineral Spirits?  (That's all the solvents I have...)

Bulletman

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Re: Silencer heat shield hardware strangeness
« Reply #4 on: October 08, 2012, 08:17:36 PM »
My Boys!!!   ;D

Thanks guys!  I think I would like to replace the bazooka with an EFI, but I don't want the bike to be any louder.  Anyway, that will probably be next season's "project".

Solvent: Alcohol?  Acetone?  Mineral Spirits?  (That's all the solvents I have...)
Mattsz, I would enjoy a drink while doing it... Alcohol works really well..  ;D
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Ducati Scotty

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Re: Silencer heat shield hardware strangeness
« Reply #5 on: October 08, 2012, 09:06:16 PM »
Acetone would work fine.  You just need something that will cut the oil.

Scott
« Last Edit: October 08, 2012, 09:29:16 PM by Ducati Scotty »

Arizoni

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Re: Silencer heat shield hardware strangeness
« Reply #6 on: October 08, 2012, 10:25:36 PM »
I doubt that Loc-Tite will last in that area of the muffler.
Based on the colors of the chrome plating I would guess it could get well over 700 degrees F.
A heavy split lock washer would probably do a better job of securing the screws.
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Ducati Scotty

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Re: Silencer heat shield hardware strangeness
« Reply #7 on: October 08, 2012, 10:27:28 PM »
Yeah, but it can't hurt either.

Scott

gremlin

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Re: Silencer heat shield hardware strangeness
« Reply #8 on: October 08, 2012, 10:42:56 PM »
Heat promotes oxidation.  Thing that get hot rust faster, simple as that.

+1
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mattsz

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Re: Silencer heat shield hardware strangeness
« Reply #9 on: October 12, 2012, 11:18:26 PM »
A heavy split lock washer would probably do a better job of securing the screws.

... and, the washer might just be thick enough so I don't have to shorten the screws...