Stripped Flywheel To Crank Bolt Hole

Good morning Jeepers.

AMC 304 circa 1972

I'm in the process of replacing my clutch and trans.

When I removed the flywheel bolts, it appears that most of the thread has come along with one of the 6 bolts. While it the hole seems like it can still retain a bolt, I doubt it will allow proper torque values to be applied during reassembly.

Does anyone know if a helicoil is a potential solution for this?

What is the bolt size and thread pitch for this flywheel bolts on this jeep?


Thanks!

 

If you can find a helicoil that is the right size and pitch I don't see why it wouldn't work. No clue as to a bolt size what size socket took it off?

 

Should be 1/2-20 stock. They have helicoils for that size repair and it'll work just fine if you know what you are doing.

You can drill them all out and go to a larger size bolt as well.

 

Thanks.
My subsequent research also points to the bolts being 1/2-20. I'm going to go with the helicoil, since re drilling all the holes and flywheel correspondingly seems like a recipe for disaster.

 

I assume the engine is still in the vehicle?.............If so you'll only get one shot at getting the hole drilled in straight the first time.
If you have a little fixture that can help you align it , that helps.........for 1/2"x 20 my HeliCoil kit says use a 33/64" drill..........take it slow with some lube as the crank will have been heat-treated ..........it's not super hard but just the same it's not mild steel either.

 

the kit should have the bit and installation tool,at least at my flaps they do.

 

Install the flywheel with a couple bolts to use as a guide if the proper drill bit will fit through it.

 

Thats the plan.

The kit has everything I need except for the drill bit, which I also bought.

Thanks for the input. I'll let you know how it goes.

 

A helicoil or equivalent will be your answer.
You can use the flywheel as a "base" to better get a hole drilled at 90 degrees. There are some inexpensive fixtures that attach to drills, or consider renting a drill with a magnetic base that could be used off the flywheel surface. As Tarry99 said, you only get one chance to get the hole right.
Take your time, and it will turn out fine.
-Donny