Talked to a retired train mechanic at the diner who said 'the best tool for a diesel is a clean rag and a patient ear' | Diesel Mechanics

Guess he never had to listen to a diesel engine with a bad knock... that's a patient ear I don't have.

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Used to think a good socket set was everything, but yeah, listening first saves me a ton of hassle now.

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Used to think like @wyatt_fox68 until I saw how much a mechanic could fix just by listening first.

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