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Old 06 January 2005, 04:15   #11
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Hi Bruce,

Petrol these days will last for a good few months before turning as they tend to add a lot of chemicals and preservatives. I have a can of petrol that I use for the chain saw and that's still fine 7 months on!

Although for your opti I would wait this length of time to test it! 3 months is probably your limit.

I flush my engine's twice a year and I've never had any problem, but then none of them have been laid up for more than 3 weeks without use.

Good question about the running engine fully trimmed with muffs on, I'd be very interested to see why this isn't good for the engine!?
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Old 06 January 2005, 06:30   #12
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Quote:
Originally Posted by Pettal
Good question about the running engine fully trimmed with muffs on, I'd be very interested to see why this isn't good for the engine!?
I may be completely wrong but is it something to do with the cooling passages and the possibility of water finding its way back into the cylinder??

Also why bother running the engine when you are flushing it out. I regularly just screw out the plug next to the tell-tale exit and screw in a hose with an attachment I got from my Merc dealer. The pressure from the hose then flushes out the salt in all of the cooling passages. At the end of the day, by flushing out your engine you are simply just cleaning the cooling passages so why would you need to run the engine??
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Old 06 January 2005, 13:05   #13
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Quote:
Originally Posted by swginn
Also why bother running the engine when you are flushing it out. I regularly just screw out the plug next to the tell-tale exit and screw in a hose with an attachment I got from my Merc dealer. The pressure from the hose then flushes out the salt in all of the cooling passages. At the end of the day, by flushing out your engine you are simply just cleaning the cooling passages so why would you need to run the engine??
As far as Iím aware most modern engines have thermostatic values within the cooling system so unless you run the engine its not going to get warm enough for all the cooling passages to be opened. My Mercury manual states that even when the screw in adapter is used the engine should be run - this method has been debated before.
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Old 06 January 2005, 13:12   #14
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flushing

Hence why i said, run engine up to normal operating temp.This will allow thermostats to open..
Paul
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Old 06 January 2005, 16:04   #15
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If your engine is fully trimmed up (trailer position) i would not run it on muffs all that water that is in the leg has a very good chance of getting back into the powerhead.

Running the engines Trimmed up normally (not trailer postion) is probably ok, but thats just the way I was taught at the Merc Marine factory.

If the boat is in the water im guessing you will have to trim it right up to get the water pickup out of the sea water.
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Old 06 January 2005, 18:10   #16
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No, put the muffs on then lower the engine down into the water with the hose running. Start up the engine in its normal attitude. Freshwater from the hose goes up and round the engine then out the usuall way into the sea along with all the brine. Salt water doesnt get in because of the seal from the muffs. when you trim the engine up you then pull the muffs off and rinse the leg off.

If I get the boat in at the w/e ill take a picture.

Tim.
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