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Mfuller
121 Posts |
 Posted - 23 Jun 2016 : 15:21:58
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Hi All,
OK, so got my boat back in the water with a new to us Evinrude 15HP that replaced our old Honda 100 (10hp).
Took her for it's first test drive and initially worked well. Decided to open her up to see what she could do, and motored for about 300 yards. The engine then started to splutter and cut out.
I was then able to restart.. it would dle for about 10 seconds, then start to cough, splutter and die. (Meanwhile we're floating down the river).
I managed to limp her back to our dock by continuously restarting, throttling up a little.. cut off.. rinse repeat.
Once back at the dock I stop/started her a few times (See the video.. issue starts around the 19s mark). And it slowly got better and better until it now seems to be idling fine.
So, any ideas why this happened?
https://www.youtube.com/watch?v=z95n25EZQ7I
Thanks
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trevork
3949 Posts |
Posted - 23 Jun 2016 : 16:44:06
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Even though I know less than nowt about outboards, that sound suggests a fuel problem to me. Intermittent supply. Maybe using it has cleaned the system through a tad?
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df
United Kingdom
5994 Posts |
Posted - 23 Jun 2016 : 16:47:19
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Tank vent been closed while out of the water?
I've had the stand pipe inside an outboard tank split letting it suck air unless completely full, it had gone brittle with contact with fuel, not the best pipe to use in a fuel tank...
NBAS--The communal colostomy bag of the boating community.
Visit leomagill.co.uk |
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IanM
United Kingdom
2238 Posts |
Posted - 23 Jun 2016 : 17:06:01
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Yep, that's gotta be fuel related.
Partial blockage, or sucking in air, or contaminated fuel, or old fuel?
Now that it seem to be running better go and repeat the test (but stay close to home!) |
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Lester Mayo
United Kingdom
289 Posts |
Posted - 23 Jun 2016 : 19:45:40
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| Just a thought have you tried it with the lid off, if it runs ok off then you have exhaust gasses leaking into the hood, this causes the engine to run until the oxygen level is affected. |
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Lester Mayo
United Kingdom
289 Posts |
Posted - 23 Jun 2016 : 19:48:27
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| I meant to say does it run ok with the lid off. |
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Mfuller
121 Posts |
Posted - 24 Jun 2016 : 08:48:51
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Thanks all, some fantastic advice. I was thinking is was a fuel issue but was panicking that I had over-revved the engine and broke something :)
The problem did happen with the lid on, but continued to happen with the lid off. It's running fresh fuel and the tank valve was open. The only thing I can think of is debris in the tank. Although I emptied the old fuel out.. I wasn't very thorough so I may have stirred up some gunk.
Thanks for all the advice. I'll take her for another run (and take a paddle this time!) |
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cliveshep
Thailand
1324 Posts |
Posted - 24 Jun 2016 : 14:49:42
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Clean the carb and the fuel filter, you might well heve filth in the carb or even water in the filter can cause these problems. The jets on these engines are very small so almost anything can block one causing problems.
Finally living the dream!
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jud
United Kingdom
113 Posts |
Posted - 24 Jun 2016 : 21:33:01
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bloke on the yard said crap in the carb.
didn't say how often to do it, tho.
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Mfuller
121 Posts |
Posted - 28 Jun 2016 : 13:14:29
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Shame I didn't know about these issue until it was back on the water.. will make working on the engine interesting :(
The weird thing is.. once it's stuttered and died, you can restart it instantly and it'll be fine again for anything from 2 seconds to a minute. You'd think carb issue would make starting it hard? |
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cliveshep
Thailand
1324 Posts |
Posted - 29 Jun 2016 : 03:50:59
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That last statement of yours could signal a different problem - float needle valve sticking or faulty fuel pump or leak in fuel line as it sounds as though it is using up the fuel in the float chamber, you prime and start it and of it goes again until the float chamber is empty again.
Just a thought!
Finally living the dream!
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Mfuller
121 Posts |
Posted - 29 Jun 2016 : 13:14:55
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Crap.. wouldn't know a float valve it it slapped me in the face.
I've got the service manual for the engine, but might as well be in French. Sadly no marine engineers willing to come out and look at it :\
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cliveshep
Thailand
1324 Posts |
Posted - 30 Jun 2016 : 09:25:34
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Well, think of your toilet at home, it has a big valve with a plastic ball that floats up and shuts off the water.
Same with your engine except it is a lot smaller!
Follow the petrol pipe from where you connect your tank, it goes to a fuel pump, possible via a little filter. THe fuel pump looks like a flat aluminium box bolted to the side of the engine with the rubber pipe going in one side and coming out the other.
When it comes out it wanders round the engine to the carburettor. Where it goes in is the float chamber and if you carefully remove the carb and put it on a newspaper on the dining room table 'err indoors will wack you round the ears with last weeks Radio Times but after she has expended all her energy you can set to unscrewing the float bowl which is under the carb and next to the ful pipe connection.
Try and drop the bowl off with the carb the right way up because sometimes the pivot pin drops out and then float, lever and needle valve fall out onto the carpet - they are small and the devil to find again. Once the bowl is off you can very carefully turn the carb over noting exactly how everything fits together. I suggest you take a pic of it.
There is often a pin holding the float lever to the carb body, and you can see the little needle valve above that that lifts as the fuel lifts the float up, that is what controls the level of fuel in the float chamber. Some carbs have the float on a central tube and the lever is separately hinged. Either way slide out the little stainless pin, remove lever and float and the little float needle will drop out.
Then you can remove the valve seating and clean everything up before re-assembling. Make sure the needle does not stick in the up position - if it does you'll have to by a new float valve assembly. The usual problem is muck in one of the jets or the float needle sticking.
In the red-outlines area in the pic below, 16 is the float chamber, 24 is the float, 19 is the pivot pin that holds it and 20 is the needle valve assembly.
Seemples! Don't mullah (no pun intended) up the gasket or it will leak petrol all over the engine.
Finally living the dream!
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Edited by - cliveshep on 30 Jun 2016 09:39:52 |
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Mfuller
121 Posts |
Posted - 01 Jul 2016 : 15:08:37
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Thanks Clive, really appreciate the info.
I've just purchased a carb kit for the engine that includes new gaskets, and I believe a float valve. Once I receive it (I could only find a US supplier) I'm going to give it a go!
Many Thanks for all your help. Your a star! |
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df
United Kingdom
5994 Posts |
Posted - 01 Jul 2016 : 17:14:15
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quote:
bloke on the yard said crap in the carb.
quote:
Well, think of your toilet at home
FFS Clive, the man has an engine problem not a personal hygene or toilet training issue! (as far as I know, I stand to be corrected)
 
If all else fails consider a litter tray.
NBAS--The communal colostomy bag of the boating community.
Visit leomagill.co.uk |
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IanM
United Kingdom
2238 Posts |
Posted - 01 Jul 2016 : 21:21:58
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I'm pretty sure I could crap on the carb but crapping in it is beyond my skill level. Soz.
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Topic |
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Evinrude 15HP Issue
