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Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3976
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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2001 Mercury 25hp 2stroke serial #OT186868 prop driven gh

Customer Question

2001 Mercury 25hp 2stroke serial #OT186868 prop driven
High pitched noise after warmed up, sounds like belt squeal on a car. happens in gear or neutral. Have recently found auxiliary stator (charging coil) bad. Replaced that and the rectifier, also put in new impeller and spark plugs as maintenance . Engine runs great but noise is alarming. Sounds like it is coming from lower end of engine in between the engine and lower unit. Is there a way to lube the lower engine bearing or is there any other bearings between the lower engine roller bearing and the outdrive?
fellow expert in the auto repair side
Submitted: 2 years ago.
Category: Boat
Expert:  Charles replied 2 years ago.

Hello Tom, my name is Charles.

Could you take a video of the engine and post it here. There is nothing that should be rubbing where you are talking about. The driveshaft just goes thru a large opening in the drive-shaft housing.

Customer: replied 2 years ago.
Have to do that next time on the water or in the driveway with ear muffs.
Expert:  Charles replied 2 years ago.

Driveway might be better as you can move around the engine.

Customer: replied 2 years ago.
Ok I'll get back to you tomorrow then. Thanks. I've been wondering about the lower roller bearing on the power head. Is there a way to lube it? Looks like it would have to be torn all the way down to replace right?
Expert:  Charles replied 2 years ago.

is is lubed by the fuel/oil mixture as it flows thru the engine. There is a hose that leads directly to the front of it.

I come online after 530 PM CST weekdays. I do have a normal day job as well.