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Exhaust Manifold stud broken
Posted: Fri Oct 06, 2017 9:58 am
by Nickerz
|Does anyone know what the thickness of the material around the studs are. As in how close are they to the water jacket. Will a m12 thread with an m8 thread insert be ok.?
Re: Exhaust Manifold stud broken
Posted: Fri Oct 06, 2017 2:59 pm
by jimmyspeed
well they often get helicoiled - which needs a larger tapped hole to fit the insert
why the jump from m8 - to m12?
Re: Exhaust Manifold stud broken
Posted: Fri Oct 06, 2017 3:20 pm
by martauto
With an internal thread of M8 x 1.25 the drill size is 8.3mm for helicoiling.
Mart.
Re: Exhaust Manifold stud broken
Posted: Fri Oct 06, 2017 3:32 pm
by jimmyspeed
less than i thought, but after tapping its in essence like tapping a standard m9/m10 hole
Re: Exhaust Manifold stud broken
Posted: Fri Oct 06, 2017 4:32 pm
by biffer
When a garage repaired a broken stud on my NO.1 cyl., they ended up with a timesert screwed into a larger timesert so there must be a fair bit of metal around them?
Re: Exhaust Manifold stud broken
Posted: Sat Oct 07, 2017 5:38 pm
by martauto
jimmyspeed wrote:less than i thought, but after tapping its in essence like tapping a standard m9/m10 hole
It is indeed but the only other option is to circular mill the hole and weld an insert in which will not be cheep.
Mart.