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#11
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Flushing the Mercruiser
That one has been in my urban legend category for a while.
The muffs start leaking when you turn the water on full so I really don't see how you can get enough pressure to damage anything. Also you've seen that impeller, it is pretty tough. I've always had a hard time seeing how any water pressure could do anything to it. It may be possible to blow out some of the gaskets under the pump housing with enough pressure but I still don't see how you can get the muffs to stay on enough to build up that pressure. "Boots Crofoot" wrote in message . .. One more think on using the muffs. DO NOT run the hose at full blast. Just crack a little cause too much water pressure and flow will damage the rubber water pump impellers. Take it from an x merc. mech. "Lawrence James" wrote in message ink.net... Flushing with the muffs will flush the entire coling system including the outdrive. The raw water pump is in the outdrive. Run for about 5 minutes or until the temp gauge shows normal operating temp to insure that the thermostat opens. You really can't beat this flushing technique, it is cheap and thorough. A closed cooling system can increase the life of some of your engine components. Unfortunately the parts that will deteriorate the fastest in salt water are the exhaust manifolds and exhaust risers. The combination of hot exhaust and salt water makes an extra corrosive mix. No closed cooling system will include the exhaust risers. The raw water from the closed system heat exchanger is used to cool the risers and then dumps into the exhaust. Some closed systems will include the exhaust manifolds and some will not. It takes more cooling capacity to include the exhaust manifolds. There are different gaskets and hose connections for the exhaust system when you convert them to a closed system. In salt water depending on amount of use the life of exhaust risers can be as little as 3 to 5 years. Manifolds a few years longer. They should be removed and inspected when they start to reach these ages. The engine cast iron block its self will wear out long before the effects of corrosion will matter. There are lots of raw water cooled inboard blocks running around and sitting in salt water for 20 years or longer. "Rich" wrote in message . com... I'm fairly new to motor boats, we now have a Mercruiser 5.0, operated in sal****er only. Is there a better way to flush other than the "ears" over the outdrive? I thought at one time there was some kind of setup to flush the motor without running it, anyone know for sure? TIA Rich |
#12
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Flushing the Mercruiser
One other thing I was advised, is not to drain the block. It seems to make
sense as that will expose the block to air (oxygen), with the moisture present will make things worse. Of course if you are winterising, that's another matter and some kind of inhibitor should be used. I don't have this problem, no winters over here. Tan PS "Rich" wrote in message . com... I'm fairly new to motor boats, we now have a Mercruiser 5.0, operated in sal****er only. Is there a better way to flush other than the "ears" over the outdrive? I thought at one time there was some kind of setup to flush the motor without running it, anyone know for sure? TIA Rich |
#13
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Flushing the Mercruiser
Perhaps you could inject rust inhibiting antifreeze. Just a thought. -- Capt. Frank __c \ _ | \_ __\_| oooo \_____ ~~~~|______________/ ~~~~~ www.home.earthlink.net/~aartworks "Tan PS" wrote in message ... One other thing I was advised, is not to drain the block. It seems to make sense as that will expose the block to air (oxygen), with the moisture present will make things worse. Of course if you are winterising, that's another matter and some kind of inhibitor should be used. I don't have this problem, no winters over here. Tan PS "Rich" wrote in message . com... I'm fairly new to motor boats, we now have a Mercruiser 5.0, operated in sal****er only. Is there a better way to flush other than the "ears" over the outdrive? I thought at one time there was some kind of setup to flush the motor without running it, anyone know for sure? TIA Rich |
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