On these old L-Heads, has anyone come across flogged out threads in the block that the breather tube screws into? For some reason, on this engine I couldn't get the breather tube to screw down, on inspection I noticed the threads were gone on the breather tube, so I ordered a new one.

[Linked Image from i.postimg.cc]

[Linked Image from i.postimg.cc]

[Linked Image from i.postimg.cc]

[Linked Image from i.postimg.cc]

As I had expected, the threads in the block were gone as well, so the new part didn't tighten down. Now, this is a 23-year-old engine and I know financially it doesn't make sense dropping money into a basic Briggs. As I have mentioned before, this mower and engine hold sentimental value, to the point where I re-ringed the engine last year.

To repair this, I'm considering a helicoil, which with the valve cover removed, it wouldn't be depositing metal fragments into the block.

Would love some feedback on this.

Last edited by DFB; 08/04/25 06:56 PM.