jbloyd
Veteran Member
Lehman 120's. Port gauge (upper and lower helm) reads 150, STB reads 170. The engines have been off for almost a week. This is a new to me boat and this anomaly was written up in the survey during the sea trial when the gauges were reading, Port = 180, STB = 195 while running at 1600 rpm. I am assuming this is the coolant temp. I have purchased a temp gun and, after checking its accuracy against known sources, shot the block at the temp sensor. The Port side is 69 and the STB is 71 (a light source had been shining on it for a while). The question is, could this be a new problem that is just now showing up and what would cause it? If the problem is old it could indicate a mismatch between the sensor and the gauge that the PO just ignored and made a mental compensation for. Tomorrow I'm going to be cruising for about 3 hours with a training captain and will shoot the temps again when they reach op temp. I expect the gauges will be close to the temps seen during the sea trial. If so, and the temps found with the gun are, as I expect, about 180, and within 5 degrees or so of each other, what would I need to do to correct the gauge readouts?