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Bolts and nuts loosening over time (Read 57 times)
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Bolts and nuts loosening over time
06/06/21 at 13:45:00
 
I have a 2105 S40 with a little under 8000 miles on it.

Last year this forum solved a lot of my exhaust backfiring by suggesting that I check the two exhaust bolts (that attach the exhaust pipe to the engine) for looseness.  It worked!  Thanks!  They were looser than they should have been.  I then resolved to check them about every 1000 miles of additional riding.

I checked them again this year after about 1000 additional miles, and they were somewhat loose again.


So based on this I have two questions:
1.  Is there some way to solve the problem of the bolts loosening over time?
2.  Are there other bolts/nuts on the bike that are known to loosen over time?


Thanks in advance for your help.
Ron G
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DragBikeMike
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Re: Bolts and nuts loosening over time
Reply #1 - 06/06/21 at 15:20:44
 
The header fasteners loosen over time because the thermal cycles work at the thick spiral-wound gasket.  Each heat-up and cool-down cycle alters the stress on the gasket.  Over time, the joint stress relaxes a bit.  It's normal.

You might want to keep an eye on the 8mm cylinder head nut directly below the exhaust port.  That one also tends to loosen up.
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justin_o_guy2
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Re: Bolts and nuts loosening over time
Reply #2 - 06/06/21 at 18:34:20
 
It's Much Better to tighten occasionally than decide to get it TIGHT and not worry about it again.
Snugging something once in a while is a Lot easier than fixing broken volume stripped threads.

Snug them cold..
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Keifer
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Re: Bolts and nuts loosening over time
Reply #3 - 06/09/21 at 05:51:50
 
Yep I'm scared to over-tighten and strip something in the soft aluminum - as a newb wrencher there's nothing worse than that!  I periodically just snug them up.  Same with the head cover and side cover bolts all around... as advised on this forum  Wink
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Mavigogun
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Re: Bolts and nuts loosening over time
Reply #4 - 06/14/21 at 09:58:40
 
Ideally, the Savage is to be ridden towing a trailer featuring a foam cut-out of the entire parts catalogue; as things inevitably fall off, having a convenient place to store and reference the missing parts is invaluable.
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Re: Bolts and nuts loosening over time
Reply #5 - 06/14/21 at 10:34:22
 
Grin Grin Grin
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