Lower unit

rinker209 · Aug 24, 2009

I was greasing my sterndrive and noticed a piece was broke off. I was wondering if it affects anything. Do I need to replace my lower unit. I have not taken it back out on the water yet to check if anything was affected. Any fixes I can do short of replacing the lower unit. I attached a pic the red arrow points to wear the it broke. The piece missing is about 1-2 inches long. What is this part of lower unit called? Could I have a piece of metal welded in it's place if needed. I have heard of people welding Skegs back together after they broke off.

Evinrude Boater · Aug 24, 2009

Re: Lower unit

It's the anti-cavitation plate. It keeps the prop from sucking down air. You know the sound when you turn too sharp and too fast and your motor revs up? That's cavitating. It probably won't make a difference if left. If you have the broken piece you could epoxy it or have it welded. Likely you would have to remove the seals and guts of the gear case to avoid damaging them when welding.

TowRoper · Aug 24, 2009

Re: Lower unit

thats the anti- cavitation plate Ive seen guys form jb weld to fix that and as far as Ive ever heard its a good cheap fix as long as its not broke so that water will get in

rinker209 · Aug 24, 2009

Re: Lower unit

TowRoper said:
thats the anti- cavitation plate Ive seen guys form jb weld to fix that and as far as Ive ever heard its a good cheap fix as long as its not broke so that water will get in

As far I can see there is not a crack through the lower unit.

rinker209 · Aug 24, 2009

Re: Lower unit

Thanks guys for the quick response. I will inspect it closer in the A.M

bigbrownbuku · Aug 24, 2009

Re: Lower unit

*cough.. anti-ventilation plate.

TowRoper · Aug 24, 2009

Re: Lower unit

buku are you cavitating lol

jtybt · Aug 24, 2009

Re: Lower unit

Yup! Anti-ventilation plate. With a cracked in that area, you're likely to introduce air and ventilate the prop.

bigbrownbuku · Aug 24, 2009

Re: Lower unit

that area is more anti splash then any ventilate, you should be fine until you pull it for service in the fall. however if you notice more rpm and less speed chances are the prop is ventilating.

i dont move fast enough to cavitate tow roper, slow and steady wins the race.

TowRoper · Aug 24, 2009

Re: Lower unit

crap i did call it the wrong name...... take a stripe lol

rinker209 · Aug 25, 2009

Re: Lower unit

So do you guys think I will need to replace or fix it. If i do not notice a high rpm at lower speeds I should be fine?

cr2k · Aug 25, 2009

Re: Lower unit

A welding shop should be able to tig on a piece with out hurting anything.

Probably won't cause any problems as it is.

rinker209 · Aug 25, 2009

Re: Lower unit

Thanks for the responses.

. I guess I will ask around and figure how much it will cost to fix. Here is a link for a aftermarket lower unit http://www.wholesalemarine.com/pc/S...t+Lower+Unit+Mercruiser+Alpha+One+Gen+II.html. Would this be a good replacement or should I get a Merc if I need one? The merc lower unti is about double the amount.

rinker209 · Aug 25, 2009

Re: Lower unit more pics

Re: Lower unit more pics

Here is my actual damage. Pisses me off. I am concerned with a chip. If you look on the last pic you will see a white dot, in the pic it is right above the break on the end. It's a decent chip can't tell if it goes all the way through the wall of the unit. How thick is wall of the unit? How can I tell if this chip/possible crack lets water in. I did not see anything coming out of chip. Does anyone know of a good Shop that can repair this break?

Lower unit

Cadet

Attachments

Lieutenant Junior Grade

Petty Officer 1st Class

Cadet

Cadet

Master Chief Petty Officer

Petty Officer 1st Class

Senior Chief Petty Officer

Master Chief Petty Officer

Petty Officer 1st Class

Cadet

Captain

Cadet

Cadet

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