I own a 1977 Hunter 30 with a Yanmar YSM12 inboard diesel engine. I recently took the boat out of the water for the winter. I started the engine up to warm up the oil for an oil change. I disconnect the intake hose from the Kingston cock and put it into a bucket with fresh water to flush the system. The water pump did not operate. I checked the obvious things - obstruction in the hoses and such. I tried a new impeller in the pump. When that did not work, I rebuilt the complete pump with new bearings and seal. I thought for sure that would do the trick because I found the old seal in very bad shape as well as a scored shaft. After replacing the rebuilt pump I tried again. It still does not suck up any water. Is there something I am overlooking? And, can I winterize the engine with anti-freeze without pumping it through? Can I remove the zinc on top of the engine and pour anti-freeze in? I am looking for any suggestions at this point.
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Prime the pump!
John: I would try priming the pump. Use a funnel to get enough antifreeze to the pump. Once it starts sucking it should work just fine.
John: I would try priming the pump. Use a funnel to get enough antifreeze to the pump. Once it starts sucking it should work just fine.
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bob shultz
water filter
You should also check the water filter bowl to make sure that you have a tight seal. If the gasket is worn you will have an air leak and the pump will never suck the water through the system.
You should also check the water filter bowl to make sure that you have a tight seal. If the gasket is worn you will have an air leak and the pump will never suck the water through the system.
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John Power
T
Terry Arnold
Be careful!
I think Steve Dion's probably on the right track. just needs to be primed. The pump is basically a displacement vane type but doesn't fit gas tight, particularly on the side of the impeller and thus may not prime itself with the water source above the engine. With the boat floating, the water pump is normally under the water line and thus self priming. Here is a link to my experience in running an engine out of the water. Don't do what I did. As far as anti freeze, rather than trying to pour antifreeze through zinc openings, seems far safer and eaier to just run anti freeze through the engine that way being sure that there is antifreeze everywhere before shutting off the engine. Catch the discharge if the yard doesn't like you discharging antifreeze on the ground.
I think Steve Dion's probably on the right track. just needs to be primed. The pump is basically a displacement vane type but doesn't fit gas tight, particularly on the side of the impeller and thus may not prime itself with the water source above the engine. With the boat floating, the water pump is normally under the water line and thus self priming. Here is a link to my experience in running an engine out of the water. Don't do what I did. As far as anti freeze, rather than trying to pour antifreeze through zinc openings, seems far safer and eaier to just run anti freeze through the engine that way being sure that there is antifreeze everywhere before shutting off the engine. Catch the discharge if the yard doesn't like you discharging antifreeze on the ground.
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R. Young
Check for suction
You say you bypassed the filter. I assume that means you connected a hose at the impeller input to a bucket of water. Make sure the hose is tightly connected to the pump inlet. You should be able to feel (with your finger) a significant sucking pressure on the hose inlet. If not, then remove the hose and check for pressure directly on the pumps inlet. If no pressure then you still got a problem with the pump otherwise it must be a loose connection or an air leak somewhere downstream.
You say you bypassed the filter. I assume that means you connected a hose at the impeller input to a bucket of water. Make sure the hose is tightly connected to the pump inlet. You should be able to feel (with your finger) a significant sucking pressure on the hose inlet. If not, then remove the hose and check for pressure directly on the pumps inlet. If no pressure then you still got a problem with the pump otherwise it must be a loose connection or an air leak somewhere downstream.
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Paul Akers
Basically, I think ...
...there's no suction because you are so far above the water (and out). But as Steve indicated, use a funnel and pour the antifreeze into the intake. It will suck it up and shut down when it begins to expel. This is a two-person job to make it a lot easier. I usually use non-toxic antifreeze for this. Also use the -100 (purple) type to ensure that it won't freeze. The pink stuff will begin to gel at 12 degrees.
...there's no suction because you are so far above the water (and out). But as Steve indicated, use a funnel and pour the antifreeze into the intake. It will suck it up and shut down when it begins to expel. This is a two-person job to make it a lot easier. I usually use non-toxic antifreeze for this. Also use the -100 (purple) type to ensure that it won't freeze. The pink stuff will begin to gel at 12 degrees.
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J. Tesoriero
Vibration
All of the prior suggestions are good. On most engines, you can also drain most of the water out by openning the drain cocks on the block and the exhaust manifold. If your boat is out of the water and up on the hard, I hope it is in a cradle. Those old Yanmars shake, rattle and roll so much that the vibrations could knock you off the jack-stands. Be careful.
All of the prior suggestions are good. On most engines, you can also drain most of the water out by openning the drain cocks on the block and the exhaust manifold. If your boat is out of the water and up on the hard, I hope it is in a cradle. Those old Yanmars shake, rattle and roll so much that the vibrations could knock you off the jack-stands. Be careful.
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Kate
Water pump
We have always primed as Paul explained, then while primed placed the hose in a pail with 50% water and 50% permanent anti freeze. We do not use non toxic as it has no corrosion inhibiters. Once the mixture comes out the exhaust we shut it down.
We have always primed as Paul explained, then while primed placed the hose in a pail with 50% water and 50% permanent anti freeze. We do not use non toxic as it has no corrosion inhibiters. Once the mixture comes out the exhaust we shut it down.
but Kate....
Kate: You mentioned that you use permanent antifreeze instead of the non toxic. Does the water that you pump through the engine have corrosion inhibitors? I would think that pumping toxic antifreeze though your engine is about the same as spilling diesel fuel on the ground or in the water. The antifreeze for the raw water side can protect down to 100 deg below zero too.
Kate: You mentioned that you use permanent antifreeze instead of the non toxic. Does the water that you pump through the engine have corrosion inhibitors? I would think that pumping toxic antifreeze though your engine is about the same as spilling diesel fuel on the ground or in the water. The antifreeze for the raw water side can protect down to 100 deg below zero too.
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