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exhaust bolts coming loose

  • Thread starter Thread starter dr_fosg8
  • Start date Start date
The problem with using bolts is the wear and tear on the aluminum threads in the head. They are already worn, any more only makes them looser, easier to strip out.
Use studs.
 
I did look for studs but could not find anything suitable. Tkent, do you have and measurements for a stud for this application? And a source to get them?
 
dr_fosg8 said:
I did look for studs but could not find anything suitable. Tkent, do you have and measurements for a stud for this application? And a source to get them?
Click to expand...

I think they are 8 x 1.25 x whatever length you need for your pipe. A little too long is fine.

I put them in with Blue Locktite, finger tight until it bottoms then back out 1/4 turn. This prevents bottoming the stud in the hole which is bad, it helps put pressure on the threads, helps to strip them out. Ask an aircraft mechanic about this part. Nothing should ever be bottomed out.

Are you using the original pipes with the cast rings or an aftermarket pipe? If the original rings the lockwasher should lock, use a new one as they get hardened with time and heat cycles too.

With most aftermarket pipes the flanges are curved, so a lockwasher won't work well. Then use anti-seize and a locknut, not a Nylock but one where the nut itself is deformed to make it stay on.

I like the copper locknuts used on BMW cars, they withstand the heat a long time and don't rust up. They should also have suitable studs, if you don't find them elsewhere.
http://www.autohausaz.com/search/pr...0@Exhaust System Nuts, Bolts, Screws, Washers
 
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So basically what I am looking for is a small piece of all-thread to loc-tight into the head?
 
dr_fosg8 said:
So basically what I am looking for is a small piece of all-thread to loc-tight into the head?
Click to expand...

No, all thread is soft, get good quality automotive studs. Don't think you could find all thread in the right size anyway.
 
As Tom said, you need proper metric exhaust studs. You may find that some small Japanese or Euro cars have the same size if you can't find bike ones. Go to an auto parts store.
 
This pic is from Z power in the UK.

P1015514.JPG


Similar to what you are after.
 
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Before tightening those exhaust bolts you might want to make sure the muffler hanger bolts are loose; you want to exhaust system to be free and able to float with the position of the head pipes. After the head pipes are snugged down, tighten the muffler hangers back down last.
 
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