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Old 17 May 2010, 10:40   #1
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Quick Flush Question

Hi,

Question relates to a Merc 2005 150hp Saltwater

I have traditionally used 'muffs' to flush my engine. However, I have just purchased a flush attachment which screws directly into the rear of the engine. I presumed this would be a better way ?

I have just read on a U.S. forum that the engine should not be running to use this attachement. Seems odd.

So, simple question really... should the engine be running when I use the screw in attachment to flush my engine ?

Cheers !
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Old 17 May 2010, 10:52   #2
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Just searched the forum and found an answer... don't run the engine

Think I'll stick to the muff's !
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Old 17 May 2010, 12:28   #3
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The attachment uses the hoses water pressure to circulate flushing water, as opposed to the water pump (with the excess pressure being released from between the muffs and the leg.)

No need to run the engine while on the attachment.

Interestingly, Suzuki used to have a video of flushing using the hose attachment, but showed the guy running the motor whilst doing so; haven't been able to find it for a while though.

jky
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Old 17 May 2010, 13:47   #4
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The Yamaha recommends using the flush attachment and not running the engine (rather than muffs).. generally I stick to what the makers recommend.
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Old 17 May 2010, 16:20   #5
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muff or no muff ............thats the question............. i say use muffs run engine
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Old 17 May 2010, 17:45   #6
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Quote:
Originally Posted by neilda View Post
The Yamaha recommends using the flush attachment and not running the engine (rather than muffs).. generally I stick to what the makers recommend.
good point

i use muffs on mine but it does take approx 25 seconds before the fresh water starts pumping back out. ive been informed thats normal as its a big block

when i bought the boat it was from dry stack down at hamble point the guy used to tie up to the jetty turn the engine off .then tilt the engine until the prop was fully out of the water then like you connected the hose fitting to flushing devise for about 3mins
i just thought it was a alterative method of flushing the engine if you was on a mooring

going forward both options are available to me which method would be best?? for my engine

muffs or the flushing connection????
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Old 17 May 2010, 19:30   #7
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I always use the flush muffs as it seems to me that you are actually flushing the impellor as well as the block then.
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Old 19 May 2010, 17:22   #8
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I always use the flush muffs as it seems to me that you are actually flushing the impellor as well as the block then.
I agree
using muffs covers all areas
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Old 19 May 2010, 18:02   #9
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How much time do you guys flush on the muffs? I always give it 5 mins
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Old 19 May 2010, 19:48   #10
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How much time do you guys flush on the muffs? I always give it 5 mins
Probably about 1 min when I did mine on muffs. A lot of fresh water goes through the engine in that time.
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