Repairing cracked Hemi head.

[rev.ronnie]

Here Is a few pictures of a head I just repaired. This is a "cold repair". The threaded, tapered crack repair plugs are interlocked and sealed. The crack is 100% repaired and good as new...probably stronger. The initial crack is punched from start to finish for clarity.

This method has been around for many years. I've been doing it for over 25 years without a failure.

The entire chamber will be polished when they are finished.

Here is a few pics of the process.

 

[440+6]

Nice job, as good as new. I have seen that type of repair on cast iron before many years ago.

 

[aldal]

Looking good.

 

[khryslerkid]

Did you drill a thru hole at each end of the crack? Preheat also before welding? Tig? Or are you using a special threaded plug of some kind?

 

[69Bee]

This a cold welding process khryslerkid. Rev.Ronnie, did you use Lock-N-Stitch? I use that myself, and works real well.

 

[rev.ronnie]

Did you drill a thru hole at each end of the crack? Preheat also before welding? Tig? Or are you using a special threaded plug of some kind?

I drill each end all the way through, tap and plug, then interlock them all the way in to the center. No welding, just threaded taper plugs.

- - - Updated - - -

This a cold welding process khryslerkid. Rev.Ronnie, did you use Lock-N-Stitch? I use that myself, and works real well.

I used Irontite plugs on this one.

I also use Sealace plugs. Look into them too. They are very unique in that the thread pitch actually draws the metal together. They are corrosion coated too.

I use seal Lock Fluid Weld to seal the plugs as I go. It's an excellent product.

 

[69Bee]

Irontite is made by Kwikway, Sealace is sold by Silver Seal. They have a reverse angle on the thread so that it actually pulls the crack together. I have used the fluid weld in the past, and it is a great product.

 

[khryslerkid]

Where have I been all these years?

I actually have never known about this type of repair.

Is that a water jacket behind the crack?

Thanks Rev!

 

[69Bee]

Where have I been all these years?

I actually have never known about this type of repair.

Is that a water jacket behind the crack?

Thanks Rev!

Yes it is.

 

[nm9stheham]

New to me... cool!

 

[2059]

Hey Rev. Thanks for sharing an age old, and proven, repair technique. Never done it myself but have seen it done. two thumbs up!!

 

[Meep-Meep]

I believe this repair is quite popular with big diesel engines. Windowed blocks, etc.. are a perfect platform for this repair.