I use a laser heat gun to monitor various spots on my diesel engine. At cruise rpms, oil filter reads around 190, heat exchanger around 180, thermostat housing 180, mixing elbow around 160 and the coupler that connects the heat exchanger to the mixing elbow always reads the highest, around 210 or so.
When I push the boat into head seas or a strong current, all the numbers go up a little but the coupler that connects the mixing elboow to the heat exchanger goes up a lot, approaching 300 degrees. The mixing elbow is stainless and this coupler appears to be cast iron. Why so hot? Is that an acceptable temp?
When I push the boat into head seas or a strong current, all the numbers go up a little but the coupler that connects the mixing elboow to the heat exchanger goes up a lot, approaching 300 degrees. The mixing elbow is stainless and this coupler appears to be cast iron. Why so hot? Is that an acceptable temp?