Broken Anti-Cavitation Plate

[Duckinator]

I have a '93 Merc 25hp with a boo-boo. A 3"x4" corner is broken off the back of the anti-cavitation plate. Including part of the trim tab support.

Options:

1) buy a new lower unit housing: I don't think so....I'm too cheap.

2) Try to cut a new corner out of aluminum plate and have someone weld it on. Probably not be able to machine out curvature for the trim tab so the tab would have to be notched to fit.

3) Cut a mild "hydro-foil" out of aluminum plate and bolt it on top of the anti-cav plate. I'm leaning towards this. Perhaps stay within curve at front then gradually extend out an inch towards the back. Don't want to catch weeds on it.

Any one have ideas or comments?

BTW - this is on an 18' flat bottom jon used mostly in knee deep water.

 

[Laddies]

Re: Broken Anti-Cavitation Plate

The shop,that does our prop repair has those type of parts available to them and repair the units

 

[dogdayx2]

Re: Broken Anti-Cavitation Plate

i also have a broken anti gravitation plate but its a small corner...well corner and down one side...

but my friend said you can buy a plate that bolts right over...

have you or anyone aver heard of this ?

 

[Texasmark]

Re: Broken Anti-Cavitation Plate

Like Laddies said prop shops do that with the equipment they have to repair alum props. James Propeller Service in the Dallas, TX. metroplex has been doing that for years.

Mark

 

[ezmobee]

Re: Broken Anti-Cavitation Plate

Welcome to iboats dogdayx2. Please start a new thread for your question.

 

[thefairlaneman]

Re: Broken Anti-Cavitation Plate

I had a chunk broken off of mine and believe it or not I moulded some marine epoxy and stuck it on. It shows no signs of coming off after several hours of running. The best fix is to weld another piece in to fit and fill in any cracks with the putty.

 

[saumon]

Re: Broken Anti-Cavitation Plate

Welcome to iboats dogdayx2. Please start a new thread for your question.

It seems amazing, he have an anti-gravitationnal plate! No more broken skegs

 

[emckelvy]

Re: Broken Anti-Cavitation Plate

Another alternative, find a busted gearcase which has the portion intact that you need. Most likely you'll find one with a broken-off skeg or cracked 'bullet' section, this is more common damage done to these than what happened to yours.

Make a clean cut on the donor gearcase, slightly larger than the damaged portion of your gearcase. Trim/fit the donor piece to your gearcase.

Then all you'd have to do is grind all the welds smooth, paint and you'll have a 'normal' appearing gearcase.

If you do a good job of fitting, any competent aluminum welder should be able to weld it up nicely for you.

Grafting an original piece onto the gearcase is much simpler than trying to make new pieces to fit.

HTH.........ed

 

[ENSIGN]

Re: Broken Anti-Cavitation Plate

Leave it alone and go fishin

 

[Texasmark]

Re: Broken Anti-Cavitation Plate

Leave it alone and go fishin

That's really the best answer if you can stand to look at it......problem with me is that I couldn't. Ha!

Mark