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Old 03 January 2005, 15:31   #1
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Optimax low on power and running hot?

Hi,

I picked up my new rib just before Christmas and took it out for the first time today. Before I bought it, we took it out for approx 1/2 hour and the engine ran fine.

However, when I took it out today there were a few problems. It started fine but it wouldn't idle too well and kept cutting out. It would start OK again? Once under way it didn't cut out any more, but it was well down on power, only reving to around 4000 with a max speed of around 28 knots. Oh, I forgot to mention that although I know it was full fo fuel the smart gauages were showing a fuel fault and that it was empty? Then, I noticed a warning message saying to reduce speed as engine overheating! Luckily I was not far away from the slipway so limped back home V slowly. The tell tale was working, although I'm not sure how much presure it should come out at?

I am hoping to take it to the local Mariner dealers either tomorrow or Wed but would appreciate any ideas, just so that I know what to expect.

Thanks,

Tony.
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Old 03 January 2005, 15:38   #2
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You don't seem to be having much luck with this new toy Tony! I think its more likely to be an electrical fault than the engine overheating, often engine management systems impose a rev limit 4k in this case when something goes wrong. It happened on my 12 year old Suzuki and all it turned out to be damp in the connections. Best thing to do is to take it to your local mariner/ merc dealer, I assume its still under warranty.
Good luck

Alex
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Old 03 January 2005, 16:04   #3
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Quote:
Originally Posted by ADS
You don't seem to be having much luck with this new toy Tony!
Tell me about it!

Quote:
Originally Posted by ADS
I assume its still under warranty.
Unfortunatley not. It's just over 3 years old so not warranty I'm afraid! Fingers crossed its not to costly.

TB
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Old 03 January 2005, 16:05   #4
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I would have a look and make sure the fuel supply is ok, It may sound odd but if your not getting the right rpm????.
If its getting hot it could be Detonation if the fuel supply is poor the mixture will be weak making the cylinders very hot and eventually melting the Pistons.
Of coures it could just be a Electrial fault.!!
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Old 03 January 2005, 16:09   #5
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Tell me about it!



Unfortunatley not. It's just over 3 years old so not warranty I'm afraid! Fingers crossed its not to costly.

TB

Take it to your local dealer but make sure your sat down when they give you the quote
Assumming its been serviced recently I would find it hard to believe if anything major has gone wrong. 'Melting the pistons' I think turbodiesel had just read your occupation!

Alex
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Old 03 January 2005, 16:25   #6
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sounds like some sort of sensor problem - another case of "crying wolf"??? Hope so for your sake!!!!
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Old 04 January 2005, 16:41   #7
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Quote:
Originally Posted by ADS
Take it to your local dealer but make sure your sat down when they give you the quote
Assumming its been serviced recently I would find it hard to believe if anything major has gone wrong. 'Melting the pistons' I think turbodiesel had just read your occupation!

Alex

Im not joking!, i see quite a few engines a year with fuel starvation problems.
I changed 2 powerheads on a 60hp. The first one was sent out under warranty. Then the engine went bang again so we got the boat back to Barrus, to find the Pistons had detonated. The Fault was traced to air being drawn in though a split fibre washer on one of the fuel filters. Im not saying the opti has that problem im just saying it as a worse case jobby.
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Old 04 January 2005, 16:56   #8
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Originally Posted by Turbodiesel
Im not joking!, i see quite a few engines a year with
I changed 2 powerheads on a 60hp. The first one was sent out under warranty. Then the engine went bang again so we got the boat back to Barrus, to find the Pistons had detonated. The Fault was traced to air being drawn in though a split fibre washer on one of the fuel filters. Im not saying the opti has that problem im just saying it as a worse case jobby.
Sorry to hi-jack your thread Tony!
So hang on a minute, if air is drawn into the engine through a leaky seal it could wreck the engine. I am only mentioning this because someone suggested that my engine had a air leak on the carb mounting gasket. I did the trick where u spray WD40 onto it and it was fine, and it runs fine but there is a sort of hissing, whirring (difficult to describe) noise if you take the cover off when its running, I think its always done it though. Engine is a '92 Suzuki DT40, please tell me if I should'nt be running it!

Alex
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Old 04 January 2005, 19:29   #9
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Bummer

It could well be a potential detonation problem and if so it needs sorting!

I don't think a spray of WD40 is gonna cure it but you mighta been born lucky!

The smartguages are really quite clever and the engine management system provides a good few safeguards but you can have faults that get past them.

The fuel fault. What was the mesage was it low fuel or water in fuel or something else?

Did the mesage appear on the test drive or were you too busy grinning to notice it!

was the boat still fullish of fuel when you recovered it?

I presume you are running with Optimax 2 stroke oil if you didn't put any in what colour is the 2 stroke oil in the tank blue or brown ?

I think it's fair to say that the water temperature and pressure from the engines tell tale should be about the same as from your own tell tale it certainly shouldn' be much hotter!

did you get any messages coming up with injector fault?

was your fuel filter seperator A ok or was it watery?

If the engine management system was unhappy then it would cut your revs down to a very small figure (it's called Guardian mode) which is about 800 revs
so I think the 4000 rev limit was dictated by something else other than the EMU like maybe you was only firing on all 5 instead of just the 6. It not a bad idea to change the plugs on a new to you engine they do come quite dear however?

I am presuming that you didn't snap the drive belt during the end of your little voyage?

Hope it all work out to be a silly one
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Old 04 January 2005, 19:45   #10
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Fuel tank breather open?
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