Stripped Threads

While searching for the source of an oil leak in our '48, I discovered that one of the screws that holds the oil pump cover (225 odd fire) on was stripped. Not the screw itself but the mating threads in the oil pump housing. Turns out it is not the source of the leak but I still would like to fix it. Any recommendations on how? Heli coil, or try to drill it out one size and tap it?

Thanks,
Wayne

 

I would be using a Helicoil-permanent fix and all the stock fasteners still fit.

 

Helicoil.

 

Helicoil.
The stainless steel insert makes stronger threads in aluminum than the way they came factory. I've done it on several with good success. Make double darn sure no chips get in the cover, oil pump cavity, gears, or in the relief valve.

 

Thanks for the replies. Helicoil was what I thought the answer might be but wanted to make sure due the the housing being aluminum. I'm not sure on the wall thickness where the heli will go...just hope it's thick enough for the oversize hole the heli requires.

Wayne

 

Best to take off the timing cover to do the work. Always nice to check the timing chain while you are in there. Seems like I usually end up replacing the water pump if it has any play and shows signs of excess leakage.

 

I use EZ-LOK inserts. It is what I learned to fix threads with.
http://www.ezlok.com/Home/index.html

Scott