MX6.com - View Single Post - helicoil head repair how-to

SleepCounter · 9-6-04, 3:32

Some will recommend tapping out the head to 10 mm or to 3/8". While that is cheaper, it necessitates doing some serious clearancing of the bolt holes in the manifold. Different rates of expansion and different coefficients of thermal expansion mean you need a bunch of clearance around the manifold studs.

When you start removing material from exhaust manifold, you are compromising it's rigidity and ability to clamp and seal exhaust pressure. So I did it the right way, rather than the cheap way.

helicoils are coils of diamond-shaped wire

with a tang on one end used to insert in a specially threaded hole.
To use them, you must remove your exhaust manifold and turbo. I'm certain there is a how-to explaining that stuff. Even if there isn't, it's not all that tough.

9-6-04, 3:32	#3 (permalink)
SleepCounter Banned Join Date: Mar 2003 Location: Calgary, AB, Canada iTrader: (0)	how'd i do that? Some will recommend tapping out the head to 10 mm or to 3/8". While that is cheaper, it necessitates doing some serious clearancing of the bolt holes in the manifold. Different rates of expansion and different coefficients of thermal expansion mean you need a bunch of clearance around the manifold studs. When you start removing material from exhaust manifold, you are compromising it's rigidity and ability to clamp and seal exhaust pressure. So I did it the right way, rather than the cheap way. helicoils are coils of diamond-shaped wire with a tang on one end used to insert in a specially threaded hole. To use them, you must remove your exhaust manifold and turbo. I'm certain there is a how-to explaining that stuff. Even if there isn't, it's not all that tough.