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Old 06 December 2004, 04:36   #1
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Have I got anything to worry about?

Went out a couple of hours yesterday had some petrol I wanted to use up
so I put in an extra 10 litres in the petrol station, after putting the equivalent 100:1
ratio of oil in first, had this really impatient T***ser behind squinnying about having to wait
I just ignored and carried on, after 10 litres I thought I'd put another 2litres in and put the
lizard lick of 2stroke oil for that 2litres in after the petrol thinking that'll be alright, itíll mix when driving down
the bumpy road, - got down to the slip, all going well, launched and turned her over and when first time as normal -
after about 40 seconds of letting her warm before getting in, the alarm went off in the remotes which~
I've never heard until now, in a moment of panic I turned it straight off as huge amounts of smoke came out it,
I thought blimey thatís it game over, turned everything off and waited 5 minutes, tried again and she was
a bit reluctant to go with the alarm in the remotes still blaring, primed the fuel bulb and tried again, after another 5minutes
and power off to everything - primed it again no alarm, started fine, good tell tale and normal amount of
of smoke, and had about 1 1/2 hours playtime all fine - Iím definitely buying a manual now as this really got me going not knowing what was up

It canít be overheating could it be a load of 2stroke improperly mixed and the outboard has some kind
of fuel/oil sensor?


Any opinions out there on what it may have been please? - (1991 2stroke yamaha 60 PTT) (60FE)
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Old 06 December 2004, 04:58   #2
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did you tip up the prop?

missus
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Old 06 December 2004, 05:14   #3
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no the engine was in the fully down position when started
the smoke was pouring out the vent hole on the top of the shaft before the main powerhead section
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Old 06 December 2004, 16:45   #4
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It sounds Funny.... I wonder was the water intake blocked buy a bag or something Like that, while you were waiting near the slip for it to warm up.

Here is one possible explaination

Bag/or object blocks water intake... no water comming in engine overheats quickly and gentaly heat sezises... then alarm goes off , when you go to restart , heat senser is still too hot.... after the 10 mins the engine cools down enough for piston to go back to its normal size and the alarm to not go off.

I know if you badly heat seazed it, It could run Like shit after... BUt if it heat seized at tickover, almost no damage would be done....

The worst type of 2 stroke sezing is heat, from lack of Oil.... and the second is just plan heat at High RPM.. where bits melt V quickly

To be honest I think you are fine
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Old 06 December 2004, 17:02   #5
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I think Tim could be right, in that the intake could have blocked while waiting for it to warm up. Was the tell tale still running?

However I doubt the engine started to seize. The alarm would have gone off long before the engine gets hot enough for that (thats why they're fitted).

Your engine has no fuel/oil sensors since its not got oil injection (it doesn't does it?). If it was smoke it could have been the choke sticking,but that wouldn't have caused the alarm .

If it went Ok after I would suggest it is OK and maybe just a temporary fault with the temp. switch. Try it again or maybe on the muffs/in a bin and see it does it again. If not then just mention it next time you have a service so they can check the senders OK.
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Old 06 December 2004, 17:36   #6
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If the water intake had of been blocked wouldn't the impellor have melted down and failed, therefore there would have been no way Ollyit could have ran ok for an hour and a half with no apparent problems ?

You metioned failure to mix the oil and petrol properly, could neat fuel have gone through and started to cause the engine to sieze ?
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Old 06 December 2004, 17:43   #7
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Can't explain the smoke I am afraid, but I managed to get damp in one of the connectors on my oil gauge and it lit up like a christmas tree, and all sorts of alarms went off. I unclipped the connection and it was full of water, no idea how that got in there, but dried it out and it was fine. Are you sure it was smoke not steam?

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Old 06 December 2004, 17:54   #8
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Quote:
Originally Posted by Bilge Rat
If the water intake had of been blocked wouldn't the impellor have melted down and failed, therefore there would have been no way Ollyit could have ran ok for an hour and a half with no apparent problems ?
Chances are if you pick up a bag there will be some water that will be enough to lubricate the impeller enough to stop it from completely melting.

Quote:
Originally Posted by Bilge Rat
You metioned failure to mix the oil and petrol properly, could neat fuel have gone through and started to cause the engine to sieze ?
Why does everyone want to scare poor olly into thinking he has seized his engine at some point
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Old 06 December 2004, 18:08   #9
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Impeller

Agree with Tue, If engine was in water then the sea water temp would transfer to the casting and pump housing allowing impeller to run dry slightly longer than normal before breaking down.
First sign to look out for is reduction in tale tale pressure with thermo stat open when at idle for a while, this would tell you that the impeller is on its way out and needs changing.
If its running ok now, leave it and check impeller at earliest chance.
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Old 06 December 2004, 18:13   #10
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I am not convinced you could have over heated an outboard in 40 seconds to the point it could have damaged anything seriously, and it did run for 1.5 hours later. 40 seconds of running wouldn't have drawn fuel from the tank, it would have still been running on the fuel in the carbs, which might have evapourated the fuel off hence a rich oil mix, and bunged up one of the reeds. Reed problems on Yamahas normally shows up by the engine "sneezing" because muck stops them closing properly. But if it ran for 1.5 hours I would worry about it. Thankfully its a Yamaha.

Oli your welcome to borrow the compression tester, its busy doing the rounds at the moment and in use this weekend. Nasher has one too.


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