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That injector return line trick saved me 3 hours on a Cummins ISX
I was fighting with a 2015 Peterbilt 579 last week that had a bad injector return line leak. Normally I'd pop the valve cover and fight those little copper washers for an hour. A buddy showed me you can use a small pick to pop the old O-ring out without pulling the whole injector. Then just lube the new one up with some diesel and push it in. Cured the leak in 20 minutes flat. Has anyone else tried this on the ISX or the X15?
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