Help im not sure wat its means

[Paza]

Hi all please help. So i have a 1970s evinrude 4hp 2stroke outboard. It doesnt miss a beat and goes really well a few pulls and shes off. I used it yesterday and when coming in to th boat ramp it looked like it was steam coming out of th exhaust holes. I turned it off and thought now thats not right. I started it up again and it started half a pull and off it went but still a bit steamy any ideas. It doesnt feel like its down on power or missing. I can c water coming out of the exhaust holes.

 

[Vic.S]

It means that there is inadequate cooling water flow. You may just need a new water pump impeller or you may also have to unblock the water passages in the power head

 

[Paza]

Thanks is it worth checking compression?? So do i just pull th leg off and check the water pump. Does it even have a thermostat and where is it located. Also does it have a pee pipe?? there was water coming out from th exhaust holes

 

[Vic.S]

Thanks is it worth checking compression?? So do i just pull th leg off and check the water pump. Does it even have a thermostat and where is it located. Also does it have a pee pipe?? there was water coming out from th exhaust holes

Check the compressions by all means but if it starts easily and runs well there is no reason to suspect they will be other than satisfactory.

The water pump is accessed by removing the gear case but it may be necessary to remove the power head and the cylinder head if the water passages are becoming choked.

If there appears to be plenty of water being blown from the relief ports check if its overheating or not before doing anything major. It should be possible to touch and maintain finger contact briefly on any part of the block and head except for the exhaust cover and the head around the spark plugs.

There is no telltale or thermostat.

The engine is covered by one of the manuals that you will find on http://boatinfo.no/lib/library.html#

You will also find the exploded parts diagrams on the BRP, shop.evinrude.com and other, parts websites useful.

 

[Paza]

Thanks heaps again iv pulled th water pump out and going to get another one this week hopefully i cant c anything wrong with it but not sure wat im looking at hahaha,. So i should remove th head as well and check that. How do i check if its over heating, just by holding th block when running. il put another water pump in it to start with and c wat happens from there.

 

[Vic.S]

Thanks heaps again iv pulled th water pump out and going to get another one this week hopefully i cant c anything wrong with it but not sure wat im looking at hahaha,. So i should remove th head as well and check that. How do i check if its over heating, just by holding th block when running. il put another water pump in it to start with and c wat happens from there.

While you have the gearcase off connect a hose to the watertube. Make sure you can get a good flow of water through the power head.

 

[Vic.S]

Thanks heaps again iv pulled th water pump out and going to get another one this week hopefully i cant c anything wrong with it but not sure wat im looking at hahaha,. So i should remove th head as well and check that. How do i check if its over heating, just by holding th block when running. il put another water pump in it to start with and c wat happens from there.

While you have the gearcase off connect a hose to the watertube. Make sure you can get a good flow of water through the power head.

 

[Vic.S]

Thanks heaps again iv pulled th water pump out and going to get another one this week hopefully i cant c anything wrong with it but not sure wat im looking at hahaha,. So i should remove th head as well and check that. How do i check if its over heating, just by holding th block when running. il put another water pump in it to start with and c wat happens from there.

While you have the gearcase off connect a hose to the watertube. Make sure you can get a good flow of water through the power head.

 

[Paza]

So take th motor out side and run water through that long tube.And that tube goes up to the head and i should c water coming out of th exhaust ports????
Do u know how much water i should expect? and if i dont get alot out then th power head blocked is that right.
Can i clean the exhaust holes out with sumthing.

 

[Vic.S]

Not particularly from the relief ports but coming back down the exhaust tube from the power head.

If you dont get a decent flow then its probably easiest to pull the powerhead remove the cylinder head and clean out any scale by hand .

Hopefully you will get a decent flow and a water pump overhaul, or perhaps just a new impeller, will be all you'll need but it would be silly not to check while the gearcase is off

 

[Paza]

cool i im going to try get a water pump today and il try and c how much flow iv got out th exhaust. Thanks heaps for all ur help.

 

[Paza]

Hi again i have got a new water pump impeller, th old one was buggered. I also ran water up th tube and through th power head and lot of water coming out so im guessing gud flow through head. This weekend i will be putting motor in my bucket and running it up to c wat its like. Oh and i did a compression test and they were both 100 even. so heres hoping its ok now.

 

[Paza]

hi so iv put a new water pump impeller in and checked flow out th exhaust. At idle i can see it running out th holes but when i open it up i can feel sum spray, but then when i drop it back to idle there is no flow out holes.iv pulled th leg off again and checked th water pump is round th right way and yep looks good. Im lost now haha. Does the exhaust only come out th holes or down th bottom somewhere. It looks like when i turn it off and leave for a few seconds then start it up again i have flow out th holes again. I dont know if its over heating or not.

 

[Vic.S]

All should now be OK. You've replaced the knackered pump impeller and you've proved that there's no flow restriction in the power head.

You'll only get a few spits and spots or a mist blown out of the relief ports.

Put it on the boat and take it for a run.

If all is ok you should be able to touch and briefly maintain finger contact with the head and block except for the exhaust cover plate and the head around the spark plugs. If you can't or if a splash of water sizzles and boils or if the paint starts to discolour its overheating.

 

[Paza]

Cool thanks il try that. il let u no how i get on. not sure when il get out, as its winter here and weather not too flash haha.