Is my Evinrude cooling enough?

[jimbouy]

Following on from yesterdays psot and reasearch the little evinrude is now running.

Needed to free up the recoil mechanism and clean out the carb.

Can anyone tell me how to judge if the cooling is shifting enough water thru' ?

I've had her running in a kitchen bin of water at as low a speed as I can, bear in mind she's always in gear.

The tell tales are producing a mist but not exactly a stream of water. Enough to soak my hand at a distance of six inches with in a few seconds.

The hotest part of the engine, a plate at the side of the cylinder, took a good 20 mins to become too hot to touch.

Appeciate any advice on offer.

jim



<hr width=100% size=1> "It is a pleasure to give advice, humiliating to need it, normal to ignore it"

 

[Talbot]

would suggest that you need more water than that, you could try a bucketful of vinegar or one of these limescale removers in the water, but expect that you will need to split the power head from the shaft, and also the cylinder head from the body and remove the clogging salt crystals.

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[jimbouy]

I haven't looked at the impellor.. could it just be in need of changing, if I can figure how.

<hr width=100% size=1> "It is a pleasure to give advice, humiliating to need it, normal to ignore it"

 

[steve28]

well done, they only ever spit out water. make sure you remove the prop to bucket test.
I have a friend that runs his in a contrate of limescale removing bleach in warm water, he runs it for 30 -40 mins and this increases the flow from the teltale but this is on a 2.2 merc


steve

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[jimbouy]

whoops, I ran it prop on, but in a large ish bin of water and at low speeds.

To clean out or not. To replace impellor or not.

Decisions Decisions.

<hr width=100% size=1> "It is a pleasure to give advice, humiliating to need it, normal to ignore it"

 

[VicS]

Some thoughts:

You could remove the prop to enable a run at higher revs but as there would be no load this might be counter productve.

If it takes 20 minutes before anything gets too hot to touch it may well be ok providing it doesn't keep on getting hotter, but that would be difficult to judge.

The fact that you get a fine spray from the telltale suggests that the pump is producing a good pressure and that the telltale outlet is almost competely blocked but it may also mean that the cooling water passages beyond the point at which the telltale is taken are blocked. Clear the telltale with a piece of wire but take care not to enlarge it.

I would expect most of the cooling water to leave unseen via the leg with the exhaust gasses, but I would expect there to be a small relief outlet near the top of the leg from which a little of the exhaust gas will leave perhaps with some water. If the cooling water is restricted then you will get steam issuing from here.

The Evinrude sales blurb I have describes the water pump on the 2hp. as a "variable volume pump". I have no idea what that is or how it might work but be prepared for something unusual if you do decide to look at it.

I would check that the cooling water telltale then fit it on the dinghy and take it round and round the Marina to see what happens. You don't want to fix what isn't broken and it may not be easy to get spares now

<hr width=100% size=1><font color=purple>Ne te confundant illegitimi.</font color=purple>

 

[lydiamight]

Find someone with a big green wheelie bin, you can clamp the outboard straight onto the top. When filled there is enough water in it to be able to run your outboard in gear with the prop attached for absolutely ages. It's also a cracking way of cleaning out the dirt from the wheelie bin!

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[steve28]

So when you have whipped up the water and airiated it so the water pump is pumping nothing but bubbles and air pockets in the block ..... that sounds like a brilliant idea.
I wonder why the service centers take the props off ?



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[mirabriani]

OOOOOOOH Sarcasm!
Probably right though
Briani

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[sailorman]

perhaps they dont need to clean their wheeelie bin

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[nickjaxe]

A lot of the older small outboards did not have a pump. but got the cooling water from the propeler thrusting water up an intake in front of it. and also from the water going past and up the intake as you go along, is it this type I wonder.

Nick.

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[steve28]

sarcasm, yes i will add that to my profile


cheers

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[Guest]

Funny how a bin .....

bigger than the average yacht club fresh-water running tank should provoke a response like that.

I run my engines in a 40 gall plastic blue drum with a half moon cut out of the top .... and flat mahogany beraer plate screwed to the front for clamps.

If the tank is small enough aeration and cavitation can occur .... but a wheelie bin / oil drum etc. is big enough ....


<hr width=100% size=1>Nigel ... and of course Yahoo groups :
http://groups.yahoo.com/group/gps-navigator/

 

[Guest]

take prop off and see what happens .... if you still get the mist instead of spray ...... then you have the answer ....


<hr width=100% size=1>Nigel ... and of course Yahoo groups :
http://groups.yahoo.com/group/gps-navigator/

 

[sailorman]

Jimbouy as i said on the previous post.
get a mariner those 2hp evenrudes were a bad engine , overheating, head gasket blowing ect

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[Andrew_Fanner]

Supposed to use a test wheel, but you try getting one

<hr width=100% size=1>Two beers please, my friend is paying.

 

[jimbouy]

If I could see one for the £40 I paid I would consider it.

If evin. gets me from boat to pub this season i'll be happy

Jim

<hr width=100% size=1> "It is a pleasure to give advice, humiliating to need it, normal to ignore it"

 

[sailorman]

i once got a bicycle for free, by the time i put gears, chain,brake blocks,mud guards, lights, ect. it would have been cheaper to have bought a new one.
anyway have a great time in the Pub

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[Talbot]

much more likely to be a build up of crystals inside the waterjacket

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[jkim1]

I had the same problem on my Evinrude. I bored a small hole in the cylinder head where the water jacket is. if the pump is working water should shoot out all the time. Writing that of course, after about 4 minutes it stops coming out, I have to slow the motor down until flow is re established. I have completely stripped the thing down and even though the pundits all said it was blocked it most certainly was not. I believe the problem to be that at times the exhaust pressure is greater than the water pressure and that stops the water circulation. Now I concurr with one of the other replies that the 2 HP is a lemon engine, and not worth spending much time on. And like he says buy a 2 HP Mariner.

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