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Thread: Noisy v6 Yamaha - please help.
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12-18-2004, 05:22 AM #15000 RPM
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Noisy v6 Yamaha - please help.
Hi guys, my 1989 200 Yamaha is making this strange noise which sounds sort of like a cross between something scraping/rattling/knocking. Very hard to describe. The boat has gone under (without the motor running) and someone did turn the key with the cylenders full of water but it did not start. After this I washed the motor out and got it going. It did cease up but I squirted wd40 down the cylenders and she freed up. The motor seems to run good but is a bit noisy. Also when I turn the motor over sloly by hand I can hear what sounds like a scraping/draging sound from somewhere in the shaft. My mate said that noise was the water pump impeller turning in its housing?
Any idea what these noises could be? Would a compression test tell me if there was any damage? Im a bit new to this so any help would be great.
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12-18-2004, 06:31 AM #2
Wow, are you serious or not?
When turning the engine around with the starter with the cylinders full of water, a lot of things can go wrong since water, unlike air, is not compressible. A rod might be bent, for example.
If the engine was seized up and then freed up with WD 40, there is a good chance that there is damage to bearings, journals, rings and bores.
The scraping sound from the shaft is most likely the impeller, like your friend says.
I think you should tear down the engine.
A compression test won't hurt, but I would tear down the engine even if the compression test was good.Markus' Performance Boating Links:
www.toastedmarshmallow.com/performance
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12-18-2004, 10:23 AM #36000 RPM
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Markus is right on the money. A complete teardown is in order. Excellent chance you have bearing problems.
Ray Neudecker Over The Hill Gang Outboard Racing
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12-18-2004, 10:28 AM #4
I agree.
Tear it down now, fix or replace a few parts, save the motor.
Run it with something bad, you will be throwing it away soon.mendo
MAD SCIENTIST
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12-19-2004, 07:31 AM #55000 RPM
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How depressing... I've never torn down an outboard before. let alone a v6. Is it a big job? Likely to be expensive? Another guy I spoke to said this noise could be rust on the bore. It wasn't me who turned the key by the way but one of my silly friends. Thanks again guys.
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12-19-2004, 10:29 AM #6
Tearing it down is not difficult at all. Assembling is where things can go wrong.
If you do it yourself, it will not cost you an Australian cent to tear it down. If you ask a shop to do it, it will cost some money.
What will likely cost you some money is the parts, but if you spend the time and look for used parts and use good vendors in the US for the rest, it will not be outrageously expensive. If you let a local shop do all the work and sell new parts at list price, it will very likely cost a lot of money.
Start by getting a service manual to understand what is involved with the tear-down.Markus' Performance Boating Links:
www.toastedmarshmallow.com/performance
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12-19-2004, 10:44 PM #75000 RPM
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Thanks heaps for the help. Will keep you posted if anything interesting happens...