Raw Water Valve/Impeller Confusion - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Gas > Atomic 4
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Old 04-02-2013
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Raw Water Valve/Impeller Confusion

I realize you are supposed to start the A-4 and THEN open your water intake valve, but doesn't that cause damage to your impeller? On every outboard I have ever flushed, the manual states that you should always have water coming in prior to starting.
Also, how long should you run the engine before opening the valve?
Thanks.
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Old 04-02-2013
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Re: Raw Water Valve/Impeller Confusion

If you are confident the engine will start almost immediately, then you can open the seacock before you start and your impeller will thank you.

If, on the other hand, the engine doesn't actually catch in the first few seconds of cranking, then you should shut the RW off as you continue attempts to start - you should open the through hull immediately after the engine is running.
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Re: Raw Water Valve/Impeller Confusion

Thanks. The one time that it did start, it really pulled a lot of water out of the bucket, so I guess the water pump is doing ok.
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Old 04-02-2013
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Re: Raw Water Valve/Impeller Confusion

I've never heard that you should start an Atomic-4 before opening the water intake as standard practice, and I owned one for nearly 10 years. Never did that. If you're having troubles starting, where there is a risk the cooling water can fill the muffler and then back up into the cylinders, then yes, shut off the intake. But that's only if the engine is turning over (and not starting) for a while: more than 30 seconds I would think, depending on your exhaust system's setup.

Starting the engine without water lubricating the impeller will cause it to wear. If you're having to run without coolant (water) for a while, then you could take the impeller out.
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Re: Raw Water Valve/Impeller Confusion

If the motor is not firing in about 3 seconds its BROKEN and that is on a COLD DAY

The manual choke lets it pull in fuel very EASY
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Re: Raw Water Valve/Impeller Confusion

The choke is stuck- I mean REALLY stuck. Going to try to fix that this weekend, and change the oil, gas, etc.
BTW Tommays you are my HERO, I love your blog.
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Re: Raw Water Valve/Impeller Confusion

I think the A4 uses the Oberdorfer pump. when it comes to replacing the impeller DO NOT get the blue ones from Globe they are too short. GET OEM Oberdorfer.
jus sayin...
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Re: Raw Water Valve/Impeller Confusion

Noted!
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Old 04-09-2013
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Re: Raw Water Valve/Impeller Confusion

I'm going to replace my impeller for the first time this week. We ran the A4 last year after purchase so not sure how long it's been since it was replaced. Does anyone know if, under normal wear and tear, whether the impeller will pull off easily or will it require a puller? I hope the former but want to be prepared just in case.
Thanks,
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Re: Raw Water Valve/Impeller Confusion

The impeller should not need a puller, but if its been there a while you may need to use a couple of screwdrivers to pry the impeller straight out.. Remember to protect the gasket surface of the housing if you need to resort to this.
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