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TIL I've been setting valve lash wrong on my old 7.3 Powerstroke for a solid year.
I was watching a guy on YouTube rebuild a 12-valve Cummins, and he mentioned checking lash with the engine at full operating temp, not just warm. I'd always done it after a 10-minute idle. Grabbed my feeler gauges and checked my truck hot, like after a 30-minute drive. Every single exhaust valve was way too tight, some by almost 0.002. I guess I was just following what the old guy at my first shop taught me. Is checking lash at full temp the standard for all you guys, or is this just a specific engine thing?
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daniel_martinez841mo ago
That old guy at your first shop had you checking lash 0.002 off on a hot engine. I can't believe that method got passed around for so long.
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wyattbennett1mo ago
Worked fine for decades, man.
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