Re: The Duchess Project: 1940 Super 8 Convertible Sedan

Posted by Owen_Dyneto On 2018/1/12 12:00:57

You might try to double-nut the stud and see if it can be tightened. If not, see if it can be removed (after draining coolant of course) and use some good old fashioned gasket shellac on the threads and try again. You might also add one of those GM/AC coolant sealing pills just for good measure.

If it still leaks, time to suspect a head gasket problem. Many of us have run into the occasion when a new headgasket looked OK but upon removal after leakage we saw some damage that went unnoticed previously.