Brief Description: Checking Valve Cover Welds for Leaks
After welding up the drain tubes in the valve covers, I decided to check the welds for pin holes. I applied fluorescent penetrant to the inside of the cover and after allowing time for the liquid to penetrate, checked the other side with a blacklight. One of the six welds leaked through and had to be repaired. I'm glad I found the pin hole before the covers were installed.