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I found by accident that brake clean is a pretty good crack detectant. I was cleaning the bore of a small engine flywheel with brake clean and when I wiped it off I could see the brake clean weeping out of the otherwise invisible crack. So if the pan is clean and dry and you spray some brake clean inside the joint. you'll see it weeping through on the outside if there are leaks. A quick check if you don't have dye penetrant.This is what I use. Having said that it might be to costly for some but I do a lot of weld repairs that are open to atmosphere and cant be pressure tested. Just repaired my oil pan on the coyote and welded oil return bungs for the turbos and spotted a pin hole on one of the welds. A must have product for me. There is nothing more aggravating than finding a slight leak in an oil pan after it is sealed on the block and full of fresh oil. You simply spray the white developer on the outside of the pan covering the weld area and then spray the red dye penetrant on the inside of the same area. the obvious pinhole or crack will appear immediately but leaving it for an hr. or so is best to reveal any cold lap in a mig weld .
https://www.vallen.ca/products/220-...t-developer-standard-12-oz-aerosol-can-cloudy
Jason: This has been discussed before, but it's worth bringing up again.Interesting, but I’d be concerned about the risk of creating poisonous fumes if there’s any residual brake cleaner in the joint when you try to weld it up. I’m not a welder but have read there’s a risk of phosgene gas being released, and I know the welding shop at work prohibits the use of brake cleaner for that reason.