F115 High Pitch Noise

[Papajohn]

We have a 2000, F115 Yamaha, it's really been trouble free, other than a clogged injector, it has just started making a high pitch whine noise when running at around 1800 rpm and above. Does anyone have any idea what might be causing this?

[fairdeal]

Drive shaft bushing?

mine made a "squealing" sound

[DennisG01]

Is it more of a whistling (air) noise? Does it do it out of gear, too? If so, maybe it's something to do with the intake (dirty, or something out of place)? I don't really know, but those are just a few thoughts going through my head.

[TownsendsFJR1300]

+1^^^^^ re Fairdeal

My F150 mid bushing / drive shaft did the EXACT same thing. Same RPM's, sounded like birds squeaking/chirping nearby. Very annoying...

The lower unit needs to be dropped, Yamaha's WATERPROOF grease applied to the shaft (the machined part) and splines.

Automotive grease will NOT HOLD UP and wash out (don't ask).

[Papajohn]

F115 High Pitch Noise

+1^^^^^ re Fairdeal

My F150 mid bushing / drive shaft did the EXACT same thing. Same RPM's, sounded like birds squeaking/chirping nearby. Very annoying...

The lower unit needs to be dropped, Yamaha's WATERPROOF grease applied to the shaft (the machined part) and splines.

Automotive grease will NOT HOLD UP and wash out (don't ask).

What's involved in dropping the lower unit? I'm a mechanic but not a marine mechanic, I've never dropped a Yamaha lower unit. Thanks for the info!!

[Papajohn]

F115 High Pitch Noise

Drive shaft bushing?

mine made a "squealing" sound

Thanks for the info!!

[Papajohn]

F115 High Pitch Noise

Is it more of a whistling (air) noise? Does it do it out of gear, too? If so, maybe it's something to do with the intake (dirty, or something out of place)? I don't really know, but those are just a few thoughts going through my head.

It's not a whistle noise, more of a squeal. Thanks for the info!!

[TownsendsFJR1300]

Here's the parts fisch for your engine;

http://www.boats.net/parts/search/Ya...115/parts.html

You'll see numerous bolts on the outside of the LU. There's also one under the trim tab. (bolts 8 and #6) Those need to come out. They'll be a water tube hanging down, don't disturb it.

You also may have a piece of hose for the speedometer that gets disconnected.

I don't know if there's a separate linkage for the shifter. The newer models have a splined shaft so there's nothing to do there. It likely needs to be in neutral pulling apart/re-assembling( not positive on your model)

The LU will drop out then.

The long drive shaft will have a machined surface approx halfways up. Clean and re-grease with Yamaha's WATERPROOF GREASE. (DO NOT USE MARINE WHEEL BEARING GREASE, etc. IT'LL BE SQUEAKING WITHIN A MONTH OR TWO).

While your there, if you don't know the age of the water pump, I'd replace it. Might take 45 minutes going slow. Get the kit, not individual parts.. Re-grease the splines too when re-assembling..


PM sent...

[DennisG01]

It's not a whistle noise, more of a squeal. Thanks for the info!!

Sure. Hope you get it figured out!

[TownsendsFJR1300]

Please post back

[TownsendsFJR1300]

Any updates?