Packard Forum Index » Pre-War (1899-1942)

Okay, here goes!

I'm currently trying to restore a 1929 Model 626 Coupe. Currently the car has almost everything it left the factory with. Some exceptions being tires, certain interior pieces that get brittle with age ect. Anyhoo. The threads are literally GONE where the thermostat housing bolts up to the cylinder head. Okay I know it's not an actual thermostat due to the fact it has the rad shutters but it is where a thermostat would normally go on any other car. I really want to re-use the cylinder head. Is there anything I can do in the way of threaded inserts or SOMETHING. Could I epoxy threaded rod in? I could be grasping at straws here but I'm not sure what I can do.

**topic moved to Pre-War forum***

I'm sure a helicoil would do the trick.

And there are also solid sleeve threaded inserts that might withstand more pressure and have less water seepage than helicoils. Use those along with a good thread sealant when you install them and it should result in a strong and watertight repair.

What you can use would also depend on the overall condition of the head and how much workable and good metal you have around the bad holes. Anything you add will require drilling and tapping a larger hole for the insert or helicoil to thread into.

I'd look into a helicoil. I've used them on my 60's Fords with pressurized cooling systems and they've never let me down....

I also used them on the aluminum head of my 1954 Patrician for the thermostat housing and with the proper gasket, no leaks at all.