Re: 1941 Packard Clipper Eight Special Sedan

Posted by JWL On 2016/9/8 14:31:49

Yep, that bolt is in a main oil gallery plug hole. Problem is the threads for the plug hole are 1/8" NPT and the bolt has different threads. The plug hole may be salvageable by using a pipe thread tap to clean up the threads. If not it will have to be drilled out for the next larger size, 1/4" NPT. Pipe threads have a slight taper to them, while bolt threads are not tapered. Surprised the bolt is not allowing a leak.

(o[]o)