Groco Safety Seacock Conversion

[SlackwaterJack]

Does anyone know what the flow rate is for the raw water pump on the Yanmar 3ym30 ?
I was looking at the Graco Safety Seacock Conversion as a possible emergency bilge pump backup. However, if the raw water pump only moves a small amount of water it may not be worth the effort. (might be a good idea for the R-25 or 29 though). It includes an adapter for flushing or running the engine while out of the water. I imagine it could also be used as an emergency raw water intake if the thruhull got clogged by a plastic bag or some other piece of floating junk.

 

[rt11002003]

Can't one attach a hose to the inline flushing fitting, put a filter of somekind on the end of the hose and toss it intothe bilge? 😉 Same concept as the Graco device? :? I have a filtering device on a hose that came with a sump pump, fits both pump and flushing device, serves two purposes. 😀

Gene

 

[SlackwaterJack]

I presently have a flush fitting (T) on the suction line near the engine, but it is made out of plastic (came with the boat)so I really don't know if I should trust it. The tiny raw water filter is also made of plastic. I was thinking that maybe a proper bronze raw water filter and a bronze safety seacock conversion (located lower in the boat) would be better...Sort of like the difference between an inline plastic fuel filter and a properly mounted Racor marine water sep. fuel filter (yet another project?...yikes!).

It's probably over-kill, so I'm very willing to be talked out of sacrificing even more dollars and knuckle skin to the Bilge-Gods.

Just out of curiosity though...any idea how many gallons per hour or minute the raw water pump can move?

 

[tuggertoy]

According to the Johnson Pump website it looks like it might be between 3 & 6 gallons/minute depending upon the head pressure. Here is a link to the page that shows the chart I used to get this information http://www.johnson-pump.com/JPmarine/pr ... eries.html. I believe that the F4B-8 is the closest to the F4B-903 customer branded pumps we have on our Yanmars.

Hope this helps.

I think you might be onto something. This seems like enough capacity to be of some value in an emergency and the conversion would simplify flushing the heat exchanger and winterizing the cooling system. The biggest benefit, as you mentioned, would be switching over to an emergency raw water intake hose if some trash got sucked into the through hull fitting.

Thanks for creating more work for me. 😀

Eric

 

[SlackwaterJack]

OOPS...sorry 'bout that Eric.

But hey!, after seeing the cool fuel filter system you installed, I think this is something you could do on a rainy Saturday. Between your first cup of coffee and waiting for the toast to pop 🙂

I guesstimated about 4 gallons myself doing the "how much water went into a 5 gal bucket in 30 seconds test" but I was unsure if the house water pressure was affecting the result. I'll be home tomorrow AM, so I'm going to do some measuring and see what can fit where in the bilge ... Ideally, I suppose it would be nice to come up with a way to be able to control things without the engine cover open. Needing to lift that cover (and keep it open) in a gyrating boat while trying to rig an over the side intake hose seems daunting.

Alex