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how long can i run the engine safely without cooling water
how long can i run the engine safely without cooling water? engine is a Merc 3.0L.
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On Fri, 05 Nov 2004 20:23:05 -0800, IDT 512 wrote:
how long can i run the engine safely without cooling water? engine is a Merc 3.0L. There was a thread here recently about someone loosing an impeller vane or something like that after running a motor very briefly out of the water. But I know that the fishermen in certain places in Mexico beach their boats at full speed, and lift the motor up out of the water while it is still running as the bow hits the sand. Doesn't seem to hurt their impellers. This was probably not a really helpful post, but it's about all I know. ;-) --Mac |
Assuming the outdrive is not connected (impeller would fail within a few
seconds) and assuming adequate lubrication and assuming raw-water cooling and assuming the boat had been in the water and therefore the block was full of water and assuming the belt to the water pump was disconnected ... the water would soon boil off ... after that ... or assuming no cooling water .... exhaust is water cooled so manifold/risers could warp, water hoses could melt, head could warp, depending on the engine lubricant (some of that synthetic stuff is pretty good) pistons may or may not seize ... . Wild guess ... 3 minutes tops ... please post your findings :-) "IDT 512" wrote in message om... how long can i run the engine safely without cooling water? engine is a Merc 3.0L. |
Old Nick wrote in message . ..
Let's know when you find out! Actually i was wanting you to conduct the experiment for me :) |
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engine will overheat within about 5 minutes. Bigger problem is you will
destroy the rubber impeller on the water pump. "IDT 512" wrote in message om... how long can i run the engine safely without cooling water? engine is a Merc 3.0L. |
"Edward Quillian" wrote in message ...
engine will overheat within about 5 minutes. Bigger problem is you will destroy the rubber impeller on the water pump. "IDT 512" wrote in message om... how long can i run the engine safely without cooling water? engine is a Merc 3.0L. 5 minutes??? i was thinking closer to like 15-20 seconds! I want to start it up in the garage every once in a while and was wondering if i can run without the flush kit to avoid getting the garage floor all wet, otherwise id have to pull it out to the street each and every time. |
"IDT 512" wrote in message om... "Edward Quillian" wrote in message ... engine will overheat within about 5 minutes. Bigger problem is you will destroy the rubber impeller on the water pump. "IDT 512" wrote in message om... how long can i run the engine safely without cooling water? engine is a Merc 3.0L. 5 minutes??? i was thinking closer to like 15-20 seconds! I want to start it up in the garage every once in a while and was wondering if i can run without the flush kit to avoid getting the garage floor all wet, otherwise id have to pull it out to the street each and every time. Plus - no need to drag the trailer out of the garage Minus - possible engine overheating - possible water pump impellor damage - engine fumes in the garage And then I'd wonder about the plus and minus of starting it "now and then" and not really being able to run it long / hard enough for it to warm up. I'd be talking to your dealer, but if it's properly shut down, the battery is kept charged, and the fuel you use to start it is fresh, I'd suspect that it would be more reliable and last longer if it was left alone between seasons. This from a person who lives where we can boat all year, and has a diesel inboard. Now that's sure to attract some criticism.... David |
Oh what a predicament...
For smaller(liftable) engines, get a barrrel with fresh water and run the engine in that (a blue nylon barrel is perfect for that) For a BIG engine - or one attached to the boat with many rods, cables etc., buy a flushing kit and get a basin that'll fit under the engine. It catches the runoff and you get your engine flushed out of salt. Just open the gate, so you do not choke to death on the fumes. Dry run kills the impeller - which should be checked before each sailing season anyway! NATO4EVER Ole "IDT 512" skrev i en meddelelse om... "Edward Quillian" wrote in message ... engine will overheat within about 5 minutes. Bigger problem is you will destroy the rubber impeller on the water pump. "IDT 512" wrote in message om... how long can i run the engine safely without cooling water? engine is a Merc 3.0L. 5 minutes??? i was thinking closer to like 15-20 seconds! I want to start it up in the garage every once in a while and was wondering if i can run without the flush kit to avoid getting the garage floor all wet, otherwise id have to pull it out to the street each and every time. |
If that's the plan, just put a big e.g. plastic garbage pail under the
outdrive and fill it up with water to protect the impeller. My opinion, the engine thermostat won't even be opening so except for exhaust/riser cooling water, very little water if any will actually be input to the engine cooling system from the pail ... and the water coming out the exhaust will go back into the pail ... 15-20 seconds, no problem. And starting up like that a coupla times between outings, no problem ... but why bother? "IDT 512" wrote in message om... "Edward Quillian" wrote in message ... engine will overheat within about 5 minutes. Bigger problem is you will destroy the rubber impeller on the water pump. "IDT 512" wrote in message om... how long can i run the engine safely without cooling water? engine is a Merc 3.0L. 5 minutes??? i was thinking closer to like 15-20 seconds! I want to start it up in the garage every once in a while and was wondering if i can run without the flush kit to avoid getting the garage floor all wet, otherwise id have to pull it out to the street each and every time. |
There was a thread here recently about someone loosing an impeller vane or
something like that after running a motor very briefly out of the water. That would likely have been my problem. This was with a small outboard (4hp) and I ran the engine very briefly out of water and it trashed the water impeller. I got the damaged one back and I can see why it was destroyed. The impeller has rubber vanes which make direct contact with a hard plastic housing. Use in water works just fine as the water acts a lubricant and removes any heat real fast. But out of water, it would be like taking a peice of rubber and rubbing it on a peice of hard plastic. It would heat up very fast and leave rubber on the hard plastic in no time at all. Once a little rubber gets put down on the hard plastic, the friction goes up, more heating, more damage.. Dont know whats in your configuration but my advice would be to not run the engine at all out of water. Its not about overheating of the engine, its all about the water cooling pump getting destroyed and costing you a big hassle. |
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