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 Exhaust Header Stud broken at manifold

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peterc9
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PostSubject: Exhaust Header Stud broken at manifold   Mon Feb 12, 2018 10:14 pm

I was wondering if this has happened to anyone else - what sounded like an exhaust leak turned out to be a big one! Left hand header, the outer stud has sheared at the manifold and broken off, taking the bolt with it. The other stud/bolt is still in place, and the header has twisted around its axis about 5mm. The problem of course, is that half the stud is well buried in the outlet. The bike is with Motociclo in Sydney - way beyond my meagre allotment of mechanical skill.
Now - I didn't drop the bike, and nothing external has put any pressure on the pipe... a mystery, or is it more common than I think?
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Pete Roper
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PostSubject: Re: Exhaust Header Stud broken at manifold   Mon Feb 12, 2018 10:41 pm

Can't think it's common. The only one I've ever seen bust was one on my own bike. Yes, I felt like a complete goose!

Whenever I get something shit like this I just call up Capital Thread Repair, a mob who specialise in removing broken shit. Saves taking the head off but even that is only a half hour job.

Pete
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peterc9
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PostSubject: Re: Exhaust Header Stud broken at manifold   Mon Feb 12, 2018 10:43 pm

Thanks Pete.
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sidrat
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PostSubject: Re: Exhaust Header Stud broken at manifold   Tue Feb 13, 2018 1:35 am

The last time i took my headers off i snapped two of them off!!!! and i thought i as carefull. luckily there was enough thread to get some nuts back on and I have ordered some replacements, but like you i am not happy to have a go at replacng them, as they may break off flush and then a distinct lack of happyness will pervade the garage. So next service, i will get the garage to do it :-)
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peterc9
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PostSubject: Re: Exhaust Header Stud broken at manifold   Tue Feb 13, 2018 4:57 am

sidrat wrote:
The last time i took my headers off i snapped two of them off!!!! and i thought i as carefull. luckily there was enough thread to get some nuts back on and I have ordered some replacements, but like you i am not happy to have a go at replacng them, as they may break off flush and then a distinct lack of happyness will pervade the garage. So next service, i will get the garage to do it :-)

Yep. The stud has broken off flush, or a few mm's inside the head. This didn't happen while removing the header though - it happened while riding.
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eeyore
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PostSubject: Re: Exhaust Header Stud broken at manifold   Tue Feb 13, 2018 7:16 am

Somebody somewhere will have a drill jig for these - with a good extractory and bit of heat they will come out quite easy but to save the pain get someone in and remove all 4 then replace with factory items.
The nuts are easy to get at so remove and copperslip once a year. Don't over tighten. They will have a low cold torque setting around 15-18 lb/ft.
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Oz1200Guzzi
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PostSubject: Re: Exhaust Header Stud broken at manifold   Tue Feb 13, 2018 12:48 pm

Brass nuts, neverseez, Bob's ya uncle!
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pauldaytona
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PostSubject: Re: Exhaust Header Stud broken at manifold   Tue Feb 13, 2018 3:29 pm

If you have a steady hand, you can drill them out. Mark the center, and start with a 3 mm new drill, get that hole in the center. After that each time a bigger one.

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But with the head I had the same, someone put a stainless steel stud in. But that one was enough outside that a grip could get it out.

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Oz1200Guzzi
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PostSubject: Re: Exhaust Header Stud broken at manifold   Tue Feb 13, 2018 3:35 pm

Go to "Wot a lota crap" or your favourite auto/tool store and buy a set of easyouts. They generally come with a drill that matches the extractor.

Oh and don't use the extractor in a drill like a bloke did here at work - extractor snapped off in the hole - got pretty messy after that!

These are hand tools not power tools - gently, gently is the way to proceed.
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peterc9
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PostSubject: Re: Exhaust Header Stud broken at manifold   Tue Feb 13, 2018 6:38 pm

Thanks all - they fixed it at Motociclo, as I reckoned they would.
Apart from Pete though, no one has picked up the reason for my post... the stud sheared right out of the blue, as I was riding... WTF?
I wasn't working on the headers, hadn't dropped it, wasn't even looking at it. Heard a noise and ... header falling off. OK - only makes me love the Guzzi more, its not a Honda.
Glad it didn't happen on the Tasmania trip I just got back from...
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peterc9
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PostSubject: Re: Exhaust Header Stud broken at manifold   Tue Feb 13, 2018 10:52 pm

...just picked the bike up from Motociclo. Have to say, those guys are incredible - the heart of Moto Guzzi in Sydney, I'd say.
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Pete Roper
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PostSubject: Re: Exhaust Header Stud broken at manifold   Wed Feb 14, 2018 12:18 am

I have a lot of time for John's shop. Believe me, that's a big compliment.

Pete
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peterc9
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PostSubject: Re: Exhaust Header Stud broken at manifold   Wed Feb 14, 2018 2:37 pm

Totally. Motociclo stand by the bikes they sell.
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Oz1200Guzzi
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PostSubject: Re: Exhaust Header Stud broken at manifold   Wed Feb 14, 2018 3:12 pm

peterc9 wrote:
Totally. Motociclo stand by the bikes they sell.

unlike others...
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guzziownr
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PostSubject: Re: Exhaust Header Stud broken at manifold   Sat Feb 17, 2018 4:09 pm

The old guy down the street taught me to use three reverse thread drill bits. Mark with a punch and start with the smallest with plenty of penetrant for lubrication. The medium bit usually has the stud spinning out.
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Diablo Loco
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PostSubject: Re: Exhaust Header Stud broken at manifold   Wed Feb 21, 2018 5:11 am

peterc9 wrote:
...just picked the bike up from Motociclo. Have to say, those guys are incredible - the heart of Moto Guzzi in Sydney, I'd say.

One went last year same as yours, just riding. Wasn't too difficult getting it out. extractor and heat gun.

As to it snapping, my money is on a combination of corrosion and high revs.

Probably the most mistreated GRiSO ever that lives leaned up against the wall of my office, out in the weather. If a storm is coming I might chuck a tarp over it. Sun is making the dash white. Running great at 50,000.
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sideshowbob
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PostSubject: Re: Exhaust Header Stud broken at manifold   Wed Feb 21, 2018 5:51 pm

GRiSO abuse, bad karma!
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