Johnson Boat Parts

You won't find this on smaller 2-cycle outboards but on larger outboards, water is circulated through the engine to cool the motor. The water pump is located at the bottom of the outboard, forward of the propeller. If you look carefully at your outboard, you will notice small holes on the port and starboard side of the lower unit, these are the inlet holes for water. The water pump housing and impeller will be located above those. The impeller blades spin and force the water up through the lower unit, around the block, and then back down to the lower unit where it goes out with the exhaust.

As you might imagine, this is quite a bit more complicated than an air-cooled outboard. A lot of stuff can go wrong. Here are some tips to avoid overheating:
1. At the start of the boating season, replace your impeller. They are made of synthetic rubber and will wear out on you, *especially* if you are using your Johnson outboard in salt water.
2. Before you take your boat out, be sure to check for anything blocking the inlet holes. Bags, weeds, or debris can get stuck in or around the inlets.
3. Keep an eye on the telltale. If it isn't spitting out a steady stream, something's probably stuck.
3. I like to periodically take my outboard and run it in a tank with some clean water. Call me paranoid.
4. Keep an eye on your thermostat dummy light. If you have a service manual, read the section on testing the light to make sure it works.

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