Unless you’ve added a turbocharger then turned the pump way up, an exhaust pyro will not indicate if you’re overloading your 656.
Rather you need to watch the exhaust color. Once it becomes noticeably smoky the engine is giving all it can. Turning the fuel up further only makes more smoke (and depletes your fuel budget) – it won’t make any more power.
So instead keep an eye the water temperature and exhaust color. So long as temp stays in the “normal” range you are not smoking up the neighborhood you are not overloading the engine.
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Incidentally I’ve never operated (nor even seen…) a non-turbo diesel with an exhaust pyro. So I don’t know what kind of max EGT’s are typical for a naturally aspirated diesel under full load. I’d guess however somewhere around 900 deg - maybe even less.
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