yam 225 ox66 faint "squeel" at lower rpms

[pharmatsea]

Hello,<br /><br />I have a 2000 Yam 225 ox66. Once the motor warms up, I hear a faint, high pitched squeel that (this is the best example i can give) sounds like dry fan/ac belts on a car. I've noticed that the noise does change pitch sligtly with an increase in rpms. It makes this noise in forward, reverse, and neutral positions w/ only change in pitch relating to change in rpms. I can hear the noise from 7k rpms until the motor sound drowns it out.<br /><br />This motor has approx 400 hours. The impellor was changed in March--thermostats in May. The motor was running perfectly until i had the impellor changed--then it would run hot at idle. Thats when i took it back to the dealer and they changed the t-stats--one was very corroded. Since then, it ran flawlessly--until now. It still runs strong throughout the RPM range--no effect on performance noticeable.<br /><br />A dealer looked at it--but we couldn't hear the sound at the shop. We even muffled the prop w/ a towel, but still the sound isn't loud enough to hear out of the water. He did perform a compression check, checked for gasket leaks around the block, and says he can do no more w/o an on the water test... <br /><br />any ideas?

 

[rodbolt]

Re: yam 225 ox66 faint "squeel" at lower rpms

hello<br /> is this a 25" motor?<br /> if it is check the shaft busing in the exhaust housing just above the water pump.<br /> good luck and keep posting

 

[edwardschnog]

Re: yam 225 ox66 faint "squeel" at lower rpms

The noise you are hearing is the same I had on my same 225 XL engine. To find the problem you would need to take off the lower unit of the engine (the part where the propeller is fitted on) and just above the waterpump house you'll find a bushing, looks like a coper bushing. Try making this inner diameter of this bushing (where the shaft runs through) a little bigger in diameter. Also polish the shaft at this same location. When ready put a huge amount of grease arround that erea and assemble everything together again and you'll be done.

 

[Osprey]

Re: yam 225 ox66 faint "squeel" at lower rpms

I would not try to modify this bushing as suggested. Drop the lower unit replace the bushing and throw an impeller kit in while your there. Grease the main shaft where it rides in the bushing and re-assemble.

 

[rodbolt]

Re: yam 225 ox66 faint "squeel" at lower rpms

hello<br /> the f225 has a modified bushing but I am with Osprey.<br /> I would replace the original making sure to clean all the corrosion from the housing then grease it.<br /> good luck and keep posting

 

[pharmatsea]

Re: yam 225 ox66 faint "squeel" at lower rpms

Sorry for the dumb question...But what is the purpose of the bushing??? Is it part of the driveshaft? Why does it make the noise in neutral? If this is the problem, could there be another underlying issue causing it?<br /><br />thanks

 

[pharmatsea]

Re: yam 225 ox66 faint "squeel" at lower rpms

Are there any sources/downloads of an exploded view of this moter? I believe I can order the repair manual from a local dealer--does it have the info needed to complete this job? Thanks for the help,<br /><br />bk

 

[Osprey]

Re: yam 225 ox66 faint "squeel" at lower rpms

I believe this bushing is used on the long shaft engines only. Would think its there to provide additional support and prevent any flexing at the lower unit end.<br /><br />Link to Yamaha Outboard Parts and exploded diagrams: http://parts.yamaha-motor.com/ <br /><br />Note use the Zoom button when viewing diagrams.