Our 4600 is a Yanmar engine like yours, and it seems to run a little cold, but it always comes up to the same spot on the gauge, and stays there while operating regardless of load, so all is well. I checked it once with a heat gun and it was a little on the cool side, but was told that's OK, and it has been for 20 years. If your worried about it check it with a heat gun for hot spots, and then put some kind of gauge on it as suggested.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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