#1
IP: 71.222.198.204
|
|||
|
|||
Running the engine with through hull closed
If I want to start the engine with the through hull closed, how long can I wait to open it before the impeller burns out?
Jean-Luc |
The Following User Says Thank You to Jlmatt For This Useful Post: | ||
TimBSmith (09-07-2020) |
#2
IP: 24.224.206.117
|
||||
|
||||
Jimatt,
Once your engine starts the water should be turned on. There is no set amount of time for safely running the impeller dry. Impellers are meant to be lubricated by the water coming through. I've heard of up to a minute, however I would think that repeated running of the impeller without water would inevitably shorten it's life. That said, I've seen advertised impellers on the internet that state they can withstand prolonged water starvation....I've never had one so can't comment on how good they are. Is there something in particular that you are trying or planning to do?
__________________
Mo "Odyssey" 1976 C&C 30 MKI The pessimist complains about the wind. The optimist expects it to change. The realist adjusts the sails. ...Sir William Arthur Ward. Last edited by Mo; 10-29-2011 at 09:00 AM. |
#3
IP: 69.156.56.52
|
|||
|
|||
Running the engine with through hull closed
My thinking is that the impeller is lubricated with the thru hull valve closed until the thermostat opens. The engine coolant is in a loop until then but once the thermostat opens the water is discharged and if the valve is closed then the water pump will pump dry. If I'm wrong about this then someone please correct me.
Larry |
#4
IP: 76.118.149.176
|
|||
|
|||
The standard thermostat is a bypass, which meanss that some of the water bypass's the therm and exits out. This is used to cool the exhaust.
Why wait so long, start the engine and turn on the water, alot of folks do it that way. Steve |
The Following User Says Thank You to smosher For This Useful Post: | ||
TimBSmith (09-07-2020) |
#5
IP: 24.224.206.117
|
||||
|
||||
Jean Luc
To be honest, I don't turn the water off. I'm at the boat near every day and it starts within seconds of hitting the switch. Just have to remember that if it doesn't start immediately the first thing you do is close the intake thru hull.
__________________
Mo "Odyssey" 1976 C&C 30 MKI The pessimist complains about the wind. The optimist expects it to change. The realist adjusts the sails. ...Sir William Arthur Ward. |
#6
IP: 108.15.39.241
|
|||
|
|||
I always turn off the inlet water valve and gas valve. It seems strange to not turn them on when I get the boat ready. (I do this for all my boats- sail and motor.) I usually leave the inlet valve off until the motor starts, it takes me about 5 seconds to skip downstairs and open the valve. Not sure if this harms the impeller but it has worked so far.
|
#7
IP: 71.222.198.204
|
|||
|
|||
Quote:
So here is another version of my question: If I close the through hull with the engine running, how long does it take to evacuate most of the water from the cooling system? |
#8
IP: 98.101.207.195
|
||||
|
||||
A closed pump will not evacuate any water. To do that you'd need a good blast of compressed air, then the next time you go to use the pump you'd have an partially empty block and some air pockets to contend with, so that's no solution, even if it were easy to do.
|
#9
IP: 24.224.206.117
|
||||
|
||||
Hi Jlmatt,
Where are you. If you are in an area that doesn't get colder than -10C (15F) and are Raw water Cooled. When you hear the weather is getting cold. - remove the T-stat for the winter - use receational / plumbers antifreeze ... suck it into the engine via your T and wait until you see it spit out the stern. It will take 2 litres to do a good job for those temperatures. A four litre jug would allow you to protect twice. An idea would be to have a Jerry Can of antifreeze ...that would be could for many many protection cycles. Hope that helps.
__________________
Mo "Odyssey" 1976 C&C 30 MKI The pessimist complains about the wind. The optimist expects it to change. The realist adjusts the sails. ...Sir William Arthur Ward. |
The Following User Says Thank You to Mo For This Useful Post: | ||
TimBSmith (09-07-2020) |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
For Sale: Atomic 4 Gas Engine in Excellent running condition in boat | SeaFever | For Sale - Engines and Engine Parts | 22 | 05-17-2016 03:10 PM |
Wiring spaghetti | ndutton | Electrical | 35 | 09-07-2011 06:18 AM |
Engine Sputters and Coughs, and Needed Choke to Run Smooth | CaptainChas | Troubleshooting | 9 | 06-30-2009 10:50 PM |
Removing the engine from your boat | Don Moyer | General Interest | 13 | 06-27-2008 11:06 AM |
Removing the engine from your boat | Don Moyer | Ranger | 7 | 12-12-2005 12:24 PM |