Leaks at petcock

Q 426 - What is the best way to stop a leak at the petcock? The Spark plugs are similarly defective.

 A - A mixture of shellac and graphite to the consistency of paste is very good to stop such leaks. It is possible that the threads are crossed. If so, would suggest that both parts be re-threaded. 

 

Courtesy of:  Motor Query Encyclopedia
Circa 1922