lower unit noise

[produceguy]

Hey guys, I started my boat yesterday on muffs and I hear a rattleing noise in the lower unit when I give it gas it gets louder and faster. My question would be, just by starting the boat and no gears being engaged. What is moving in the lower unit to cause this noise? I have an alpha1 gen 1 sterndrive.
Thanks.

 

[Bondo]

Re: lower unit noise

My question would be, just by starting the boat and no gears being engaged. What is moving in the lower unit to cause this noise?

Ayuh,.... Everything but the propshaft is turning...

 

[Howard Sterndrive]

Re: lower unit noise

no gears being engaged.

or half engaged - that would be noisy
might want to check shift cable adjustments

 

[produceguy]

Re: lower unit noise

or half engaged - that would be noisy
might want to check shift cable adjustments

Please forgive me for my stupidity but if the gears were half engaged, woudn't that cause the prop to spin? As is, props not turning.
I did change out the lower shift cable and she feels like she's shifting properly.
I,m very new at this so please take it easy on me.

 

[Howard Sterndrive]

Re: lower unit noise

if the gears were half engaged, woudn't that cause the prop to spin?

yes it would, assuming everything else in the lower was ok.

might be more issues there. You could try draining and refilling the gear lube to see if any metal washes out.

I'd still look at the cables. Good to check adjustment anyways if the boat is more than 5 years old.

 

[produceguy]

Re: lower unit noise

I'll adjust them and see what happens.
Thank You

 

[captk]

Re: lower unit noise

Could be exhaust shutter noise.