2016 R29S water intake valve

S

Skennedy

Member
Joined
Jul 29, 2021
Messages
12
Fluid Motion Model
C-30 S
Vessel Name
Bobber
I always make a habit of closing my water intake valve on my Volvo D4-260 when not in use. I’m away from my boat for the next 4 weeks and believe I accidentally left it open. Curious if this is something I should be concerned about. Not thinking it is but thought I’d ask.
Thanks Steve
 
This is just my opinion, may be wrong. I think it doesn’t matter whether the valve is on or off. After the valve, most of the hoses are above sea level so water can’t flow in if valve is open with engine off. I doubt if the hoses are configured so that sea water could automatically siphon into engine and bilge if there was a leak.

If you spring a leak on a sea water hose above sea level while running engine, you shut off the engine and no more sea water would come in.

I have an inboard ski boat and it has no shut off valve for sea water and it has fresh water cooling.

I think you want to open the valve when boat is out of water to drain off excess water. No freeze that way.

So I wonder why the valves are there. It gives a good feeling that you can turnoff any entrance of sea water.
 
I think you are referring to the seacock which allows raw water to flow to the engine for cooling. It is a very good practice to close all seacocks when not in use.

If the seacock is left open, AND providing that no hose between the seacock and the engine fail/leak, there should not a flooding issue. BUT...if there is a failure, raw water will flood the bilge.

If it were my call, I would err on the side of caution, return to the boat and close the seacock.

Mike
 
Mike
I’m a little new to these motors and confused on what the engine fail/leak is. I believe my system has and independent cooling system and the raw water inlet feeds the heat exchanger and is then discharged. So the seacock just shuts off the water to that. So my vulnerability would just be a hose leak below the waterline. At least that’s my thought with my limited knowledge on the subject.
 
Steve:

I have an R29 Sedan with a Volvo Penta D4-300 inboard diesel. The following comments are based on my boat:

* There is a seacock that controls raw water to flow from under the boat. This water then flows thru a hose, thru a strainer and hose to the impeller which circulates it.

* The engine's cooling system is closed in that the raw water (salt water in my case) cools the internal water (yellow coolant) - cool salt water circulates around the internal water and absorbs the heat before being discharged back into the ocean.

* If I remove the strainer lid and open the seacock, raw ocean water will flow into the boat. The same will happen if any of the connections between the seacock and the impeller housing are compromised.

Flooding can also occur if you have any other seacocks - on my boat, this includes the generator and air conditioning.

Hope this helps. If you want to discuss further, shoot me a PM and I will give you my phone number. This is a very important safety topic.

Mike
 
Omg. It’s fine. If you checked recently and .. Hoses good? Clamps good? If yes, then Fine. Enjoy your trip.
 
Thanks Mike, good info. Mine is setup the same way. I was able to have someone run over and close it.
Thanks again.
 
No problem!!!

Mike
 
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