Thanks man!!!
Quick Question about heli-coil
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I don't see why not. Should be as strong or stronger than whatever was there.
JIM
JIM
Team Owner
Joined: Jan 2006
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From: Crossville TN
In fact, lots of places design heli-coils [or other similar brands of inserts] into aluminum parts for high torque bolts...just because they are stronger. However, be sure that you have just as many threads [or more] engaged in the insert as were in the head. You can't hold a head bolt with 1/2 the number of engaging threads as it originally had. Sometimes this means that you have to buy a bottoming drill and tap to get all the engagement possible.
Drifting
Joined: Mar 2004
Posts: 1,873
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From: Savannah Ga
In fact, lots of places design heli-coils [or other similar brands of inserts] into aluminum parts for high torque bolts...just because they are stronger. However, be sure that you have just as many threads [or more] engaged in the insert as were in the head. You can't hold a head bolt with 1/2 the number of engaging threads as it originally had. Sometimes this means that you have to buy a bottoming drill and tap to get all the engagement possible.
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Racer
Joined: Jan 2007
Posts: 365
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From: Glenview IL
Like copter said, helicoils are required in the aerospace industry if your going into aluminum. We even use them in steel. Other than tool cost, there is no downside to installing them. Use at least a 1.5D helicoil, 2D if possible. That means the length is 1.5 to 2 times the diameter.
Melting Slicks
Joined: Mar 2003
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From: Franklin IN
Melting Slicks
Joined: Oct 2001
Posts: 2,062
Likes: 1,361
From: Halifax, Nova Scotia, Canada
If a Cadillac Northstar requires a head bolt repair, the ONLY approved method (by GM) is the use of a timesert insert.
http://www.timesert.com/
When installed correctly, it's stronger than the original threaded aluminum.
The head bolt repair "Kit" for the Northstar engine was designed by GM in conjunction with Timesert.
A heli-coil repair is not recommended for the Northstar head bolt repair.
I would think that a heli-coil repair in a low torque application would be fine.
Barry
http://www.timesert.com/
When installed correctly, it's stronger than the original threaded aluminum.
The head bolt repair "Kit" for the Northstar engine was designed by GM in conjunction with Timesert.
A heli-coil repair is not recommended for the Northstar head bolt repair.
I would think that a heli-coil repair in a low torque application would be fine.
Barry
