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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Gas > Atomic 4
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  #1  
Old 01-15-2011
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Water Pump

I read somewhere the first A4's produced had gear pumps for the water pumps instead of impellers. At that time the engines were raw water cooled and, apparently, the gear pumps did not work out well. I have a FWC A4 and I am interested in finding one of these old gear pumps to install on my engine. It is really hard to get to the impeller on my boat. Any help in locating one of these pumps will be much appreciated.
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Last edited by nickmerc; 08-18-2011 at 07:20 AM.
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Old 01-15-2011
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try this one Torresen Marine

There are other sorces listed online. this is just one.
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Old 01-15-2011
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I looked there but the pump is no longer available. It's the same story with all of the suppliers I have found. I think I will have to talk to someone with an older A4.
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Old 01-21-2011
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HMP in Mississuaga, ON alwasys has Atomic4 impellers. In fact I bought one yesterday for the Oberdorfer pump on my Atomic4, the blue run dry type. They are starting to get a little expensive. CDN$39.99

Patrick
SV Eclipse, Toronto, ON
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Old 01-21-2011
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A gear pump (or any other constant displacement pump) is NOT a good idea on most applications unless you also install a pressure relief valve. The reason being that a constant displacement pump will not 'slip' - as a vane, etc. pump will, when the system becomes restricted or blocked - A4 manifolds can easily block the water flow due to 'slab rust' formation. If the pressure goes towards 'infinity' you can have some serious consequences: rupture of the circuit, flying metal, injuries, etc. A vane pump will 'slip' and 'self-relieve' the over-pressure; a constant displacement pump will 'keep on a pumping' until something either explodes, etc. or the gears fail.
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Old 01-21-2011
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A pressure relief is part of my retro fit. I am not as worried about sudden blockage on my engine as it has always been FWC. With a FWC system, at least my system, I can have the pressure relief empty into the HX so I won't have a huge mess in my engine room. This is basically a high flow, low pressure hydraulic system.

I feel that it is more likely an impeller will fail and a piece of it will get lodged in my HX causing overheating than the entire system will get plugged up and break something.
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Last edited by nickmerc; 08-18-2011 at 07:21 AM.
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Old 01-24-2011
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I went with a new moyer pump with the thumb-screws and insatlled two ball valves so i dont have to dump the anti-freeze in the rare event of a problem
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