Installing Case Savers in a Magnesium Engine Case

Discussion on all milling machines vertical & horizontal, including but not limited to Bridgeports, Hardinge, South Bend, Clausing, Van Norman, including imports.

Moderators: Harold_V, GlennW

Post Reply
Posts: 32
Joined: Fri Oct 30, 2015 2:28 pm
Location: Owasso, OK

Installing Case Savers in a Magnesium Engine Case

Post by germaneighter » Thu Apr 25, 2019 4:54 pm

Eventually I will be installing steel Case Savers (M14 x 2) into a magnesium Porsche engine case for the head studs. The original threaded holes are bottom tapped M10 x 1.5. The hole depth is approx. 20mm. I have a Rockwell 21-100 mill that I plan to use for the process.

Has anyone here done this? Does anyone have suggestions about the process?


User avatar
Posts: 834
Joined: Sun Dec 08, 2013 1:40 pm
Location: southern Portugal

Re: Installing Case Savers in a Magnesium Engine Case

Post by liveaboard » Thu Apr 25, 2019 5:22 pm

I did something like that for my old Mercedes block. I used fine thread 14mm inserts with 12mm internal threads.
In my case, the engine had 'wet' bolt holes, open to the water jacket, that I wanted to close. And the block is cast iron.
I drilled and tapped the block on a big drill press.
blind inserts om636.jpg
In your case, I think helicoils would do the job well and easily.

User avatar
Posts: 3397
Joined: Thu Mar 18, 2010 2:05 pm
Location: Northern Nevada

Re: Installing Case Savers in a Magnesium Engine Case

Post by warmstrong1955 » Thu Apr 25, 2019 5:41 pm

I've done a lot of VW Beetle cases, for buggies & Baja's. It used to be pretty much a routine to put them in, whether they were needed or not, if you were rebuilding, and bumping up the HP.
Most I did on a mill....easier to stay on center of the cylinder bore, but did some on a drill press. Always used a endmill, rather than a drill, as it stayed on center better.
They used to sell kits....back when VW Buggies were popular.
They are pretty forgiving. I know some people that did them by hand.......

Today's solutions are tomorrow's problems.

Post Reply