Flange nuts continue to looses?
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Tourer
Joined: Sep 2022
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From: Ireland
Flange nuts continue to looses?
Hello people.I recently added a set of Big Shots staggered to my 114 fat bob.6 spins later and the flange nuts continue to looses.Ive been tightening them to 10Nm but they keep loosening.I've heard that this happens for a few hear cycles but I've a feeling this isn't what's going on here with me.Either the tightening torque is lower than recommended or something else.
Any ideas?
Any ideas?
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From: England
Looking at the big shots I would assume after lightly doing up the bolts you do up the flange bolts to pull in the headers and then do the fixing fasteners at the bottom of the pipes?
I can only guess the headers aren't making a sound connection in the ports so they can vibrate. The only suggestion is to undo all the fasteners so the pipes are loose and do up the flange bolts first.
10Nm is what is also specified for the Sportster.
I can only guess the headers aren't making a sound connection in the ports so they can vibrate. The only suggestion is to undo all the fasteners so the pipes are loose and do up the flange bolts first.
10Nm is what is also specified for the Sportster.
Thread Starter
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Tourer
Joined: Sep 2022
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From: Ireland
Looking at the big shots I would assume after lightly doing up the bolts you do up the flange bolts to pull in the headers and then do the fixing fasteners at the bottom of the pipes? I can only guess the headers aren't making a sound connection in the ports so they can vibrate. The only suggestion is to undo all the fasteners so the pipes are loose and do up the flange bolts first. 10Nm is what is also specified for the Sportster.
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Tourer
Joined: Sep 2022
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From: Ireland
I understood.Also does it matter which cyl head port is done 1st and also which flange nut top or bottom 1st?
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Tourer
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From: Ireland
as I do also.I meant for the 'final' tightening does it matter.Id guess not.
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Tourer
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From: Ireland
Also the mounting bolts need to be 'started' before you tighten the flange nuts down.Otherwise it's nearly impossible to get them near the nuts to get them started.
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This all suggests they are not a particularly good fit and metal is being sprung but probably why the instructions get you to install all of the fasteners before going round and tightening them up.
The flange nuts will be at final torque before you do up the pipe mounting bolts/screws to the brackets.
The flange nuts will be at final torque before you do up the pipe mounting bolts/screws to the brackets.
Last edited by Andy from Sandy; Dec 13, 2022 at 07:59 AM.
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Tourer
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From: Ireland
This all suggests they are not a particularly good fit and metal is being sprung but probably why the instructions get you to install all of the fasteners before going round and tightening them up. The flange nuts will be at final torque before you do up the pipe mounting bolts/screws to the brackets.