2007-08-02 11:49:37 · 19 answers · asked by Dan 1 in Cars & Transportation ➔ Boats & Boating
In all fairness to the posters above, they are thinking of lower units as well as closed sytems with raw water cooling.(heat exchangers) Now think out of the box folks......what about those boats that DO NOT use raw water at all and are a true closed system with no heat exchanger much like your vehicle in your driveway.
Source::: uncle and brother in B.C. airboat bulders and tech.
2007-08-02 14:01:21 · answer #1 · answered by vfisher27 2 · 1⤊ 1⤋
Boat engines require cooling water from the sea. If you start the engine out of the water, you have to provide an external source of water.... there are special connectors available so you can use a garden hose. Starting an outboard or an I/O without a source of cooling water will blow the water pump in about 10 seconds and the entire engine in about 30 seconds.
2007-08-04 13:53:25 · answer #2 · answered by squeezie_1999 7 · 0⤊ 0⤋
No, and not for the reasons posted. Though it is true that prolong running of the engine will cause damage the biggest reason NOT to start an engine is because of the water intake impeller. Every boat engine has to kinds of water pumps. The fist is the impeller which pushes water from the bottom of the lower unit up to the engine. The second is the engine’s own water pump. If you start the engine without putting the lower unit in water you will tear up the impeller. I know, been there and done that, just once.
2007-08-02 12:00:48 · answer #3 · answered by Anonymous · 0⤊ 1⤋
I cant believe some of the answers.
Get yourself a set of muffs at your local marine supplier and make sure anytime you run engine you have muffs attached to garden hose and water turned on .
It only takes seconds to burn up impeller.
The clearance the rubber impeller has in its housing is tight so when you run it dry the friction wears it down and it burns away the impeller. The more you run it without water the weaker it gets or just burns up completely.
Oh the few answers you got regarding closed cooling you still need to run it with raw water .
The raw water goes into a heat exchanger to keep antifreeze side at a reasonable temperature
2007-08-02 12:06:29 · answer #4 · answered by paultech6 4 · 2⤊ 0⤋
As long as you have a set of water muffs or a fresh water flush kit atatched to the motor and you have a hose suppling water to it, you can run it indefinately.
Without water only 15-30 seconds max.
Do not run it in gear and out of the water unless you have a test wheel on the prop shaft. The prop needs backpressure from the water or it will tear up the transmission real quick.
2007-08-02 23:49:07 · answer #5 · answered by Anonymous · 0⤊ 0⤋
only run it for a few seconds, the water pump impeller is rubber and will ruin if it gets hot, same fo the engine, no water = no coolant in the engine.
there are adapters to connect a water hose to the lower unit to allow water to circulate thru the engine... they work ok, but not made to use for long periods of time... just be careful and always look and make sure water is coming out the overflow hole... only way to know for sure that the water is actually circulating thru the engine.
2007-08-02 12:00:12 · answer #6 · answered by Anonymous · 0⤊ 0⤋
If your boat has an inboard engine with inter-cooling, you can do it for a brief moment in order to be sure your engine will start, once in the water. Make sure your gear-controls are not on; you might people there..
I do not recommend it for outboard engines.
2007-08-02 17:55:24 · answer #7 · answered by glljansen 3 · 0⤊ 0⤋
Its ok but you must use flush muffs or a container of water that the bottom of the engine can draw up water to keep it cool, it always a good idea to flush the motor when its been used in dirty or salt water, flush muffs are the ideal way to do this.
2007-08-04 22:56:54 · answer #8 · answered by Anonymous · 0⤊ 0⤋
I would definately not recommend this.You can get a cheap set of "muffs" that you attach to your garden hose that will deliver water to the motor.I also have a crate that fits neatly under the motor with enough water in it so I dont have to worry about how long the motor is running without coolant
2007-08-02 16:15:22 · answer #9 · answered by geoffrey s 1 · 0⤊ 0⤋
No it is not OK ! besides the engine seizing up due to no water cooling, the exposed propeller blades is VERY dangerous. And as the engine is desinged to run in water there will be no resistance to the propeller and the engine will run faster than it was desinged for and will cause very expensive damage.
2007-08-02 12:02:41 · answer #10 · answered by John L 5 · 0⤊ 0⤋