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Thread: flushing engine

  1. #1

    Join Date
    Jun 2010
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    flushing engine

    Cant seam to find old post or able to watch video. So How long should I flush my engine? Am I correct to say flushing just really cleans the pump. It doesnt circulate water through out the exhaust?


  2. #2

    Join Date
    Jan 2006
    Location
    Texas City, Texas
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    Really don't know what engine we are talking about. For the most part, you can follow the water hose line. It flows into the bottom of the exhaust manifold, fills up the cylinder jackets, then to the head. From there it goes into the water jacket of the exhaust pipe. A lot of the water is dumped back back overboard through the rear of the boat, but a small amount of it continues through the end of the stinger part of the exhaust where it mixes with the exhaust gasses. This water is used to create back pressure on the exhaust to help the engine work more efficiently.

    Remember to start your engine first, then turn the water on. You can flush it for just a few minutes. When water starts coming out of the exhaust and out of the back of the boat, then all of the engine and pipe jackets are full. You just flush it for a couple of minutes after that.

    You then turn the water off, and rev your engine a couple - 3 times to get all of the water out of your exhaust piping. You should not rev the engine out of sight because it has been said that it is hard on your reed valves. After a couple of revs, you should no longer have any significant water being blown out, then shut your engine down. DO NOT let your engine idle for any significant time without the water hose.

    It benifits you to leave the seat off so that the engine compartment can air dry.

  3. #3

    Join Date
    Jun 2011
    Location
    Locust Grove, VA
    Posts
    48
    what would happen if you cut the jetski off first and then turn the water off?

  4. #4

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    There is a potential for you to back up water from your exhaust system into a cylinder, filling up the crankcase. It won't happen immediately, but it potentially can happen. Don't even give it a chance.

    The rule is "water is the last to be on and the first to be off".

  5. #5

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    thanks

  6. #6

    Join Date
    Jun 2011
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    Locust Grove, VA
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    second that.....thanks.

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