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Overheard a shop foreman say he'd never use a scan tool on a 12-valve Cummins
I was grabbing parts at the local NAPA and two guys were arguing about old engines. The foreman from a big fleet shop said, 'A real mechanic can fix a 12-valve with a multimeter and a screwdriver, a scan tool is just a crutch.' It got me thinking about how much we rely on computers now. Do you think there's still value in learning the old-school diagnostic methods for mechanical engines?
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jakep245mo ago
That foreman is mostly right, but a multimeter alone won't get you far on a 12-valve. You still need a timing light and a mechanical tach to set the pump correctly. The real skill is knowing which simple tool to use for each step. Relying only on a scan tool is a problem, but so is pretending one tool does everything. The middle ground is knowing how to use both the old methods and the new ones when they actually help.
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nina_hall4mo ago
lol that foreman is kinda right but his take is a little too black and white. You can definitely get a 12-valve running with basic stuff, but you're not gonna set the fuel timing or check the governor properly without a timing light and a decent mechanical tach. A multimeter won't help you with the injection pump timing either, that's all mechanical lock pins and dial indicators. The real trick is knowing which old school tool actually does the job, not just pretending you can fix everything with a screwdriver.
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irisb265mo ago
Honestly that foreman has a point, but it's bigger than just engines. Feels like we're losing the skill of just figuring things out by looking at them and listening. My dad could tell what was wrong with our old truck by the sound it made, and half the time he was right. Now if an app doesn't spell it out for us, we're stuck. There's a real value in that kind of basic problem solving that applies to way more than just fixing a diesel.
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