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Warning: I used to think a quick tap with a hammer could fix anything until a fuel line fitting proved me wrong.
I was working on a 6.7 Powerstroke in a shop in Boise, trying to free a stubborn high-pressure fuel line connection. After three tries with a wrench, I gave it a firm hit with a ball-peen hammer. The fitting cracked, spraying diesel everywhere and costing me over $200 in parts and a full afternoon of cleanup. That mess taught me that force is never the right answer with precision fittings. Now I reach for the proper line wrench and a bit of penetrating oil every single time. Has anyone else learned this lesson the hard way on a modern diesel?
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rivera.susan6mo ago
Disagree completely, sometimes a hammer is the only language some parts understand. I've freed dozens of seized brake line fittings on old farm trucks with a few sharp raps on the wrench handle after penetrating oil did nothing. The trick is knowing where and how hard to hit. You can't treat a plastic housing the same as a solid steel nut, but writing off all percussive persuasion because of one broken fitting is throwing the baby out with the bathwater. A lot of this new stuff is over-engineered and too fragile anyway.
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the_wren6mo ago
But what about those fragile plastic fittings...
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paulc935mo ago
My buddy tried the hammer trick on his washing machine's plastic drain pump. He gave it one solid tap with a rubber mallet and the whole housing just shattered into pieces. Had to order a whole new pump assembly, cost him eighty bucks and a weekend. Sometimes the new plastic stuff really is just that brittle.
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