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Old 03 June 2011, 15:52   #1
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is this bad?

Guys

went out for a gentle spin today, before going out fired up as normal on the muffs for 2mins and then properly in the sea 20minutes later once launched, the engine under load sounds normal but has a metallic noise that comes and goes, it never used to have this noise, I tried to film it as best I could, didnt want to open it up for obvious reasons, its a 1990 Yamaha 60FE, premixed with plenty of quicksilver oil, thoughts anyone im scared it could be a main bearing, its not a knocking noise, and I take good care of this engine so im a tad worried

sorry for video noise was a good force5 out there today



[YOUTUBE]
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Old 03 June 2011, 17:18   #2
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Where exactly is it coming from?

It's hard to work out with camera sound quality and wind noise. It doesn't sound good though. I wouldn't use it 'til it's sorted.
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Old 03 June 2011, 20:04   #3
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Does it only do the sound under load? Nothing there when revving up in neutral?
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Old 04 June 2011, 05:35   #4
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Ave a look at end play on the prop ot might be hitting the casing under load

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Old 09 June 2011, 11:11   #5
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thanks I'll check the prop -

thanks for your time guys I took it out gently, its a bit more noisy now, my marine engineer friend assured me it wasnt the main bearing as he'd be able to hear it, I took it out and it was okay, hit "wot" a couple of times, just about managed to get back tot he slipway - it lost at least 50% power, and limped back around 10knots - lucky I wasnt to far out, it would bog down if I throttled up so I pulled back, does this sound like fuel to you?

thanks in advance
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Old 12 June 2011, 19:13   #6
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Originally Posted by ollyit View Post
thanks I'll check the prop -

thanks for your time guys I took it out gently, its a bit more noisy now, my marine engineer friend assured me it wasnt the main bearing as he'd be able to hear it, I took it out and it was okay, hit "wot" a couple of times, just about managed to get back tot he slipway - it lost at least 50% power, and limped back around 10knots - lucky I wasnt to far out, it would bog down if I throttled up so I pulled back, does this sound like fuel to you?

thanks in advance
I had similiar problem with a Yamaha 60, it was in fact fuel pump.

Loss of Power is due to:
1. Not proper combustion
2. Mechanical failure in your gearbox

So to check the first one, do the following;

Does it smoke more? Does it smell of unburnt petrol? Check the cylinder compression (buy a tester from Halfords for like 30, you will use it alot) if the compression test was OK, then check the spark plugs, if the bottom cylinder plug was WET then it is probably fuel pump diaphragm.

Mechanical failure can be identified easily as your engine under load may sound differently than neutral position.

My 2001 Yamaha failed on Gearbox so I am after a new engine now...!
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Old 13 June 2011, 10:19   #7
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Compression test it.
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