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Merc 25H making squealing noises, help!


EBass

Question

I have a 1988 25H merc manual start. Last night I noticed when I slowed down this higher pitched squealing sound was coming from my lower unit. At idle it went away. Then went to a different part of the lake and now it's louder and it still squeals at idle and gets louder when I give her gas. I shut her down a used the trolling motor.

My friend thinks it's my water pump. Has anoyone ever heard of this? Could my lower unit be shot? Would that make a different sound?

I'm a first time boat owner and I have no idea.

Please help out if you can.

Thanks,
EBass

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#39, ah see now. Just to recap (no internet at home to ask you over the weekend) Remove the four main bolts on the lower unit. (plain as day to see) Also, remove the bolt under the counter balance, then it should slide right out? Nothing

We already messed up. When trying to get it off the first time we switched gears while the lower unit was dropped (about an inch)We did bolt it back on and now it shifts hard and not right. So I'll be messing with that. Now that I said that do you guys have any tricks for simple alignment when putting it back on?

Again thanks for all your help.

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Surface Tension, Valv...

I took off part # 39 the counter balance and looked underneath for the bolt. I did not see one. However; I have ran it a few times and no squealing sound anymore!! So the line caused that issue.

Thanks for all your help. Valv with the serial # I posted do I have a different model than what you were thinking?

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