Hoping to get some thoughts from others on a problem I have with my outboard.
Some background:
It's a 60HP 4 Stroke Yamaha outboard made in 2003. I was in the Pine River about 12 months ago doing some fishing with my young bloke when I ran aground on a rocky/shale bottom, not large solid rocks, probably about half a fist size. I had to replace my prop afterwards and it also started making a pretty bad whine around 1500RPM, the noise stops at about 2000RPM. There is no noticable vibration, just the whine.
Here's a vid of the noise:
[YT]https://www.youtube.com/watch?v=RoJJnmypY5k[/YT]
Since the noise has started it has had a full service and also had the lower unit removed to check the clearance of the drive shaft, the noise is still there.
I'm pretty convinced now that the problem is in the gearbox, it dosn't make the noise when the boat is out of the water, it needs the pressure from the water to make it occur. Perhaps it's a thrust bearing? It also doesn't make the noise around 1500 to 200RPM in reverse, only forward. More ammo for gearbox/thrust bearing fault.
What do you guys think? Anyone with any outboard knowledge/skills?
Has anyone stripped an outboard gearbox before? I'm happy to give it a go as long as there are no pitfalls?
Cheers for any help.
Edit: The new prop is fine, it clears well and there are no telltale rub marks where it might be touching. The motor hits 6000RPM so it appears to be well matched.
Some background:
It's a 60HP 4 Stroke Yamaha outboard made in 2003. I was in the Pine River about 12 months ago doing some fishing with my young bloke when I ran aground on a rocky/shale bottom, not large solid rocks, probably about half a fist size. I had to replace my prop afterwards and it also started making a pretty bad whine around 1500RPM, the noise stops at about 2000RPM. There is no noticable vibration, just the whine.
Here's a vid of the noise:
[YT]https://www.youtube.com/watch?v=RoJJnmypY5k[/YT]
Since the noise has started it has had a full service and also had the lower unit removed to check the clearance of the drive shaft, the noise is still there.
I'm pretty convinced now that the problem is in the gearbox, it dosn't make the noise when the boat is out of the water, it needs the pressure from the water to make it occur. Perhaps it's a thrust bearing? It also doesn't make the noise around 1500 to 200RPM in reverse, only forward. More ammo for gearbox/thrust bearing fault.
What do you guys think? Anyone with any outboard knowledge/skills?
Has anyone stripped an outboard gearbox before? I'm happy to give it a go as long as there are no pitfalls?
Cheers for any help.
Edit: The new prop is fine, it clears well and there are no telltale rub marks where it might be touching. The motor hits 6000RPM so it appears to be well matched.
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