I inherited a V-6 Johnson from my father-in-law. I can run this engine all day at 4500 rpm. Any faster, and within a minute the overheat alarm comes on. The water discharge is always strong; the water gushes out the two holes at the top of the engine. The scenario never changes. Any help?
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By: Grid Michael
February, 2010
You’ll need a friend for this one. One of you drives while the other uses one of those handy temperature guns to check the external cylinder temperatures. I’d bet that at 4500 rpm, all six cylinders are showing about the same temp. Concentrate on the odd number cylinders. If it’s number one, odds are that you’ve got a piston-seizure problem, and the heat is transferring to the sender, despite the excellent cooling you describe. Unfortunately, that’s expensive and requires a powerhead teardown, but it costs less than a new engine.