Today I discovered that the plastic caps on my engine raw water
strainers have hairline cracks and are slowly leaking. They are Groco ARG bronze strainers, but the top caps are plastic.
The cracks run along the threaded part of the cap parallel to the threads. I expect they are the result of the previous owner wrench tightening the caps rather than hand tightening.
Has anyone seen this happen before? If it's common, I'll considering replacing them with bronze caps, but they are 3x the cost of the plastic ones. However if it's just due to abuse, I'll stick with plastic and just not abuse them.