C-121 Hydro. Release valve seized.

[Fordiesel69 271]

Part of me says don;t touch it, but I will regret it when the engine quite some day and it can;t be pushed.  Busted a stanley open end, and bent a snap on.  Any ideas how to break this loose without breaking it?

[Fordiesel69 271]

Back up top.

 

The release valve is just a 3/8" stud you turn counterclockwise.  Does anyone have any ideas how to break this loose?

[Kelly 1,033]

Heat, but not too much.

[jeremi3210 742]

Try pb blaster for about a week. If you can find a nine point socket it will fit on the sqaure head. Also when you try to turn it lightly tap on the case next to the plug. Again i mean lightly.

[Jeff-C175 7,206]

 

If you can find a nine point socket...

 

Jeremi, surely you mean an EIGHT point socket?

[jeremi3210 742]

Yep. Thanks fot the correction jeff.

[608KEB 796]

Heat on the side of the case worked for me on three of them. I put a little anti-sieze on the threads. I open the valve 2-3 times a year.