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Old 04-27-2011, 11:25 PM
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Default mercruiser flush

first off i want to thank everyone who contrubutes here, i have learned so much by just reading over the years...

but now i have to ask a question, i have ready many threads both here and other places and cannot seem to get direct answers.

i am about to drop in a reman'ed merc 5.7 into my boat, new exhaust and the works. the boat is raw water cooled and has an alpha drive. motor is the early 80's spec, so it seems my options are really limited for flushing the engine after use- the boat sits in salt water full time.

i cannot use the perkos and other similar flush systems becuase the water will not pass the thermostat with the engine off, and i cannot run the engine becuase the alpha has the raw water pump in the drive. the merc. flush adapter does not work with my year (gen 1) circulation pump hose...

FWC is too much $...

i have been told that the muffs are no good becuase hoses do not have enough water pressure and will burn my impellar out faster... plus the hassle of getting them on in the water.

the only option i keep seeing is the superflush

http://www.superflushsales.com/sf-400.html

i have to admit, i am skeptical... but i have talked to them a few times and they reassure me. i like the concept, but does anyone have any first hand experience?

or should i just let it go with rwc and replace the manifolds and risers in a few years... how long is the lifespan on a new cast ironn intake manifold in rwc?

just trying to weigh out the options. i should have the motor ready to drop in the boat in the next week. i see my options as leaving it rwc and no flush or trying superflush...

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Old 04-28-2011, 05:44 AM
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They work well. They used to be called something else - but I forget the name.
Used it on a Merc 502. When I changed thermostat, there was zero salt build up. The Navy also uses the same system for their motors. Highly recommended
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Old 04-28-2011, 10:55 AM
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BillR- thanks for your input!... "highly recommended" is encouraging

from my research i saw that mst guardian was the previous product that was similar. the company has since gone out of business and someone involved split off to create superflush which uses a turbine type system instead of the shuttle valve in the mst.
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Old 04-28-2011, 11:08 AM
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Quote:
Originally Posted by Billr302 View Post
They work well. They used to be called something else - but I forget the name.
Used it on a Merc 502. When I changed thermostat, there was zero salt build up. The Navy also uses the same system for their motors. Highly recommended
I'm pretty sure he's talking about the MST Guardian, if they still make them under that name.
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Old 04-28-2011, 08:07 PM
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This is the cost of fresh water cooling...maybe you want to consider this?:

http://www.mrcool.us/engine-products...oling-kit.html

Between the flushing constantly, it may not be that bad.

We also do manifolds and may be able to help with costs there:
http://www.mrcool.us/mercruiser-v8-2...5-270-280.html

It's just information to help you make decisions about the overall costs/benefits.
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Old 04-29-2011, 09:45 AM
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thanks for the info Russ
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Old 05-06-2011, 05:07 PM
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I talked to Ed Dennison at superflush again today and pulled the trigger on a unit... it should be here next week just in time to install it on before i drop my new motor in.

I will post some pictures and a review when i get it on.
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Old 05-19-2011, 05:52 PM
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Default don't get "Superflushed"

I know some folks have miraculously had good experiences with these but I hope you haven't paid for this system yet. I got suckered in by their marketing and FOOLISHLY bought 2 of these units direct from the manufacturer for my F225s. After a year, YES A WHOLE YEAR, of countless emails (seldom returned), phone calls (seldom returned) I got the units installed and the flow out of the engines is barely 1/2 of when I use the flushing attachment.

I tried both units on both engines and got the same pitiful results. I ran a whole quart of salt away through each engine, no difference. I have videos of the units working, or not working, if you are interested.

Thank God I didn't drill the holes in my cowlings before testing the units !!!!!

I guess it's possible that I got 2 bad units but the customer service is so incredibly bad that I would rather give the $250 to a homeless person and save myself the hassle of having to deal with them again. Once again this was directly with the factory / owner Doug and not any of their distributors.
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Old 11-26-2011, 05:02 AM
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searoy,

What were the results of installing your superflush system?
Did you experience anything like "swimdad" did as far as the water flow?
How was the installation process?
Do you recommend it?
What model superflush did you purchase?

I have a 97spec Merc 5.7L 350 Vortec remanufactured from the GM plant. I installed it last June '11 and put about 20 hours on it prior to winterizing and getting deployed (USMC). I'm still deployed but am looking into corosion protection for next season. I'm considering a fresh water cooling system but don't like the price. Also I read somewhere if you don't do it before the engine is run in salt water, then don't do it at all...I guess something about the existing salt in the motor will form a gel with the anti-freeze/coolant resulting in clogged passages. Not sure how true that is but I plan on looking into that one.

Any info on the superflush system will be much appreciated!
Thanks
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