Yamaha outboard problem after it had been on seabed for 24hrs.

[westcoast]

Hi guy's, I have a 2002 Yamaha 8hp 4stroke outboard (F8CMH) which was submerged for 24hrs after dingy sank.
I've flushed out the fuel system & changed oils, plugs etc.

The engine starts no problem but when I try to give it revs it's fine for around 20-30 seconds then it starts getting very rough,engine shakes & the emergency warning light starts to flicker dim & sometimes bright.
When I started it at first after flushing the light was on constantly but the more I start it the less bright the light gets.

The light is still flickering & it idles fine until I give it revs.

Any help will be much appreciated. /forums/images/graemlins/grin.gif

 

[Topcat47]

Solid state ignition system? Washed it with clean fresh water? Cleaned carb with proprietary carb cleaner? They'd be my first ideas.

 

[Csail]

Water in part of the electrics .. just WD40 it and give it time to dry.

 

[clyst]

If its been under tidal water you can bet that sand /mud is in the main and big end bearings . Unless a complete strip down is done the engine wont last but a few hours . Sad but true seek the advice of a qualified outboard engineer . Can you seek compensation from your insurance ??

 

[Lakesailor]

I'd agree. We stripped a Mariner 25 that had been under flood water on Ullswater (for quite some time). The engine was packed with silt, and straw. Absolutely amazing how much debris was in there.

 

[cliff]

Give it a good clean, spray everything with WD40 or Duck oil, clean the carb well and get it running then put it on Ebay and get rid of it. - Sold as seen - running!
--------------------

"Artificial intelligence is no match for natural stupidity"
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[westcoast]

Hi, thanks for quick replies. The engine was drained of oil & fuel & put into a tank of fresh water for a few hrs after the divers brought her up.
It was lying on hard ground sitting on the hull with engine still on tilt so mud & silt shouldn't be a problem.
I'm hoping it's just a problem with damp electrics & have taken off the coil etc to dry off in doors.
Found a few tests to be done with digital tester so I'll do that when things get dry.

Thanks again for your help, Sandy.

 

[clyst]

"so mud & silt shouldn't be a problem." Believe me it will . Its the water bourne particals that cause the problem .

 

[westcoast]

"so mud & silt shouldn't be a problem." Believe me it will . Its the water bourne particals that cause the problem .

Yea I appreciate what your saying, I'm on west coast of scotland where the ground is hard & has very little water bourne silt & mud particals compared to Cornwall.

I suppose time will tell after a season of running as the engine gets used every day.

I'll keep you posted, Sandy.

 

[westcoast]

Replaced oil pressure switch & she runs a treat! Thanks. /forums/images/graemlins/smirk.gif

The shafts too long for the new pioneer 13 so looks as if she'll be getting sold soon.