So you’ve made some repairs to your boat’s engine, and now you want to test the whole thing before putting it back in the water. This is smart thinking, but it hides a complication: a marine engine is different from an automotive engine. It depends on the water it normally sits in to cool things off, and it wouldn’t like to walk around in dry air. Luckily for you, there is a solution, and it looks a lot like a garden hose.
Running your boat’s engine in drydock means depriving it of coolant, unless you can supply it by other means. They come as a means motor flusher muffsWhich adapts a garden hose connector to your engine’s water intake ports. There are different designs, depending on whether your engine is an inboard motor or an outboard like Honda’s first production V8, but all manage the same basic function: putting water where your engine wants it, so it can stay cool while you test things out.
don’t leave the muffs
Now, you can try to think of me here, and expose your engine’s flush port. Of course you could just put a hose straight in there, which sends water through the engine, and avoid spending the whole $28 for the muffs. Correct? Not good. The path that water takes from that connector is not the same as the path it takes from the proper inlet port, and it can burn out your propeller by sucking out air – or worse, cause your engine to overheat due to improper cooling.
If you want to run your boat’s engine without having to deal with the annoying hassles of “being out on the water” or “having fun in the sun”, you can get an inexpensive set of muffs and attach a garden hose to them to provide cooling. Just make sure you get a set that really holds up to your engine well – read some reviews first, and get something that other people have used successfully with your manufacturer’s engine.
