OMC 3.0 Liter 4cyl engine 1979 OVERHEATS when slow or stopped in water
I have a 87 bayliner, I had to replace the engine with a new block..(OMC 3.0 liter 4cyl, drive unit is a OMC cobra)I found 1979 block and head. The engine will run fine when crusing, but when slowing for docking and stopping for skiers the unit will over heat. ENgine is very hard to start when shut off at this point. I have replaced the water pump (engine) and I have installed a new impeller and cover. When the engine is running with a hose, the unit runs fine and stays cool. I have no thermo.. When in the lake, the main water hose to the waterpump when squeezed doesnt seem to have must water going thur it.. Recap. Engine runs fine with water hose attached, runs fine at the lake when running over 1500 rpms, but below that in the lake it over heats and then does want to start. New waterpump, new impeller, NO thermo installed.
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