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Old 04 December 2011, 11:32   #1
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mariner 25hp 2 stroke

hi all, with regards to my early xmas present, (25hp mariner 2 stroke) I fired her up yesterday on single sided flush muffs, and noticed the stream of water from the tell tale was pretty weak and rather warmer than usual.

Is this normal ?

Stream is a lot stronger when submerged in my wheelie bin, but I dont fancy lifting 51kg into a wheelie bin everytime I flush it out.
Am i doing something wrong, my tohatsu is no problem on the same flush muff.

regards. paul.

btw thanks b&o for the quick response regards the kill cord
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Old 04 December 2011, 12:04   #2
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turn the tap on a bit more?. my old 75hp mariner barely had a tale tell on a hose unless i cranked the tap right up. i had the bottom off it quite a few times as better safe than sorry and everytime i done it the impeller was fine and outboard worked when in the water.

cheers
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Old 04 December 2011, 13:41   #3
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Thermostat

Those models tend to pump as and when needed rather than a constant cool flow

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Old 04 December 2011, 14:39   #4
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Thermostat

Those models tend to pump as and when needed rather than a constant cool flow

Peter ~ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007
Unless is an EX MoD one (there are hundreds knocking about) The cooling system is modified to have a colder tell tale so it runs all the time. You can tell the Ex MoD ones as the tell tale comes from the exhaust cover on the block instead of the top of the Thermostat housing.
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Old 04 December 2011, 14:41   #5
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Unless is an EX MoD one (there are hundreds knocking about) The cooling system is modified to have a colder tell tale so it runs all the time.
True, but I'm not sure if they were still in commission in 2006 when this one was made ?

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Old 04 December 2011, 14:45   #6
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True, but I'm not sure if they were still in commission in 2006 when this one was made ?

Peter ~ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007
Yeah, MoD had them from about 1995/6 and they still use them today (although the engine went out of production in late 2008.
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Old 04 December 2011, 15:11   #7
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Out of interest how were they modified ? Did the stat get replaced with a washer etc to restrict the flow ?

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Old 04 December 2011, 15:20   #8
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I fired her up yesterday on single sided flush muffs
Does that mean only one intake port is getting water?

or is there only one intake port on this engine?
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Old 04 December 2011, 15:58   #9
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Out of interest how were they modified ? Did the stat get replaced with a washer etc to restrict the flow ?

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Its a Secret!!!
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Old 04 December 2011, 16:06   #10
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Its a Secret!!!
LoL

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Old 04 December 2011, 16:44   #11
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just moving the muffs slightly on the ports makes all the difference on my 75
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Old 05 December 2011, 04:14   #12
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Hi

as above some engines are v fussy with muffs on them so turn tap on full and keep moving them around a wee bit.

Also why were you not shown by the person you bought it from? Even more so if it was a dealer?
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Old 13 May 2012, 05:30   #13
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hi all, took my mariner 25hp 2 stroke for its first outing last weekend.
used it on the back of my aerotec 380 and it really flew.
great weather and a great weekend
my question is... (as previous thread) when i came to flush on single sided flush muff, the water from the tell tale was barely noticeable and what little water did come out was very hot.
am i doing something wrong or do i buy a set of double sided muffs or maybe a collapsible bucket i can throw in my camper for flushing when on the campsite.
i also read somewhere that these engines dont like flush muffs and when flushing you may have to block off certain outlets with gaffer tape.
any ideas would be much appreciated.
btw tell tale was strong when flat out but trickled when in neutral out at sea.

many thanks in advance
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Old 13 May 2012, 06:16   #14
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bucket or muffs

hi all, took my mariner 25hp 2 stroke for its first outing last weekend.
used it on the back of my aerotec 380 and it really flew.
great weather and a great weekend
my question is... (as previous thread) when i came to flush on single sided flush muff, the water from the tell tale was barely noticeable and what little water did come out was very hot.
am i doing something wrong or do i buy a set of double sided muffs or maybe a collapsible bucket i can throw in my camper for flushing when on the campsite.
i also read somewhere that these engines dont like flush muffs and when flushing you may have to block off certain outlets with gaffer tape.
any ideas would be much appreciated.
btw tell tale was strong when flat out but trickled when in neutral out at sea.

many thanks in advance
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Old 13 May 2012, 12:27   #15
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mine used to flush fine on single sided muffs, though had to make sure they were positioned just right. check out the water pump itself for signs of wear.
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Old 18 May 2012, 12:18   #16
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Quote:
Originally Posted by uny1965 View Post
hi all, took my mariner 25hp 2 stroke for its first outing last weekend.
used it on the back of my aerotec 380 and it really flew.
great weather and a great weekend
my question is... (as previous thread) when i came to flush on single sided flush muff, the water from the tell tale was barely noticeable and what little water did come out was very hot.
am i doing something wrong or do i buy a set of double sided muffs or maybe a collapsible bucket i can throw in my camper for flushing when on the campsite.
i also read somewhere that these engines dont like flush muffs and when flushing you may have to block off certain outlets with gaffer tape.
any ideas would be much appreciated.
btw tell tale was strong when flat out but trickled when in neutral out at sea.

many thanks in advance
Hi Uny, sounds like I have similar issues! Recently bought an old 15hp selva, tried in the bin and wasnt really pumping water, fitted a new impeller and bought some cheap single sided flush muffs... fired up today and just a trickle from the 2 telltales. Whilst I was replacing the impeller I had the hose on the water pipes so I know the passage ways are clear.. I found very difficult to get the muffs to seal so i think half the problem is not enough water getting to the impeller.. will have to wait till tuesday and I can try it in the bin again when its been emptied!! Bit reluctant to take it somewhere to try as its lots of work loading up, blowing up sib to find engine not running properly!previous owner said pumped much better when flat out and where the inlets are located I can see that there would be quite a bit of pressure generated by forward motion....however previous owner also told me it had a thermostat..which it definitely doesnt! if the bin test is an improvement may have to just bite the bullet and go try it... I would think if you had a whole day out without problems yours may be ok??
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