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Old 04-20-2017, 12:36 PM   #1
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Default A.C. Issues and prop

Hello.

I have 1997 3000 scr. It has twin 4.3, alpha 2 out drives, Kohler generator.

First issue ac. Cleaned out filter that feeds pump, that feeds ac. Was very nasty. Pump appears to run, but not getting any water discharge out front of boat like typical. I took boating maintenance course few years back seem to remember this being a common issue. Can't remember the remedy, anyone have any information to share.

Also I believe I have spun hub. At high rpm props or prop not turning. No power to get on plane. Engines sound run find. Boat operates fine at low rpm, not when putting under pressure. I can't find owners manual anywhere. Wanting to know what type props came out on this boat. SS, alum, pitch etc.

Thanks for any help you can give me.



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Old 04-20-2017, 01:27 PM   #2
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Weclome aboard seanbaker2010 !!!!

I'd suggest two separate threads. Otherwise this is going to get messy.
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Old 04-20-2017, 02:07 PM   #3
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Weclome aboard seanbaker2010 !!!!

I'd suggest two separate threads. Otherwise this is going to get messy.


Sure thing. Thanks.


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Old 04-20-2017, 02:36 PM   #4
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Welcome Seanbaker2010... Try taking a vac hose from a drynvac to suck the water out of the outlet opening on the left front side of your boat. But before all this make sure there are no blockages from your hull opening to your pump etc etc. Sometimes I have to do that to get things started at the first part of the boating season.

Good luck

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Old 04-20-2017, 02:40 PM   #5
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Welcome Seanbaker2010... Try taking a vac hose from a drynvac to suck the water out of the outlet opening on the left front side of your boat. But before all this make sure there are no blockages from your hull opening to your pump etc etc. Sometimes I have to do that to get things started at the first part of the boating season.

Good luck

Roger


Thanks roger. I have water to pump, even coming out of pump. Just not to ac unit. I thought about using air compressor to blow out line and make sure no blockages. Also will do as you recommend. Appreciate your time.


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Old 04-20-2017, 03:11 PM   #6
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Originally Posted by seanbaker2010 View Post
Thanks roger. I have water to pump, even coming out of pump. Just not to ac unit. I thought about using air compressor to blow out line and make sure no blockages. Also will do as you recommend. Appreciate your time.


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You can use water hose and try to run it through the ac circuit and see if the water goes through. Just don't put to much pressure in it to avoid damaging the system.
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Old 04-20-2017, 03:39 PM   #7
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Is the boat out of the water? I couldn't get my AC pump to prime out of the water since it's above the strainer where I had the hose, but in the water, the pump is below the water line and works fine.
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Old 04-20-2017, 03:46 PM   #8
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Is the boat out of the water? I couldn't get my AC pump to prime out of the water since it's above the strainer where I had the hose, but in the water, the pump is below the water line and works fine.


In water. It's getting water. Just not getting up to ac unit. Ac will run, gets hot, no water flow kicks off.


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Old 04-20-2017, 03:54 PM   #9
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I would backflush.
If there is gunk in the line or in the a/c unit, flushing in the normal direction will just jam it in further. I disconnect the hose from the pump in the engine room and then put a garden hose (city water) on the thruhull in the bow. Let the debris, etc flow into the bilge.
You could also isolate where the restriction may be by disconnecting the supply hose from the a/c unit & check that portion of the run.
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Old 04-20-2017, 03:55 PM   #10
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Regarding the potential spun prop, is the rpms shooting up but no increase in speed? Any smell of burnt rubber in the engine compartment at the rear of the engine? This would be a spun coupler.
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