mariner 25hp broke cavitation plate

[Dino89]

split the gearbox off to do impeller and broke the cavitatiion plate phot0 attached
is there any repair kit, add on or diy repair that can be done on this ?
i have the other piece as well

[spartacus]

What did you hit it with a lump hammer?

Always a rubber mallet.

Anyway - yes it can be repaired, but not DIY. Tig weld will do it. Will need the paint from the mating surfaces removed. Apparently needs a gap so the weld draws the surface edges together for a solid repair. File down, prime and paint.

Seems to be far enough away from the gearbox seals not to cause an issue.

[jeffstevens763@g]

Ive seen on YouTube an aliminium rod that's melted with a gas torch (plumbers type) to form a weld sorry i have no more details

Found it low temp too

https://www.welduk.com/product/alumi...yweld-10-rods/

[Dino89]

Got my plumbers torch and done copper for years only worry is as mentioned above would seals or gearbox be damaged withe the heat generated , how would it affect the boat to use it as is ?

[jeffstevens763@g]

Originally Posted by Dino89

Got my plumbers torch and done copper for years only worry is as mentioned above would seals or gearbox be damaged withe the heat generated , how would it affect the boat to use it as is ?

As Spartacus has said your a long way from the gear box 360 degrees isn't going to travel down the leg and heat up gear oil to such a temp as to affect the seals plus the plate is thin and will heat up quickly. Have a look on you tube some good footage

[RoyP]

I have a similar problem and getting a new skeg welded to the gearbox. we hit a something at Tilbury last weekend.

[Dino89]

Thanks Jeff will have a look and think that's the way I will go ,

[Dino89]

rods ordered , you tube watched .......will let you know how it goes

[Barraaaa]

Find someone who can weld aluminum and it’s a handy fix iv repaired a few myself over the years ... it’s a easy fix if you know what your at

[paddlers]

Look for someone who's skilled welding aluminium . I have a firm local to me who repair aluminium cylinder heads . Ordered a bit of plate the correct thickness from ebay, shaped it to fit. They welded it for £10 and I got some etching primer and some matching (expensive) marine paint. Job done.

[ShinyShoe]

Originally Posted by Dino89

rods ordered , you tube watched .......will let you know how it goes

Practice on scrap first. My experience on some 50mm 2mm Ali tube was it's very easy to melt the tube and not so easy to melt the rods.

[paintman]

Originally Posted by jeffstevens763@g

Ive seen on YouTube an aliminium rod that's melted with a gas torch (plumbers type) to form a weld sorry i have no more details

Found it low temp too

https://www.welduk.com/product/alumi...yweld-10-rods/

There's a few of this type of thing around.
Not quite as easy as they make it look.
The tig option would be the better bet.

[ShinyShoe]

Originally Posted by paintman

There's a few of this type of thing around.
Not quite as easy as they make it look.
The tig option would be the better bet.

If you can get someone to do it for a tenner, without doubt.

If it's going to cost serious £££ then I'd be tempted to look at epoxy before risking melting my motor!

[jeffstevens763@g]

Originally Posted by paintman

There's a few of this type of thing around.
Not quite as easy as they make it look.
The tig option would be the better bet.

for a tenner for sure, there is a metal repair putty i think 3 m make it, or fit a dolphin

[Matt]

I wouldn't be going in with a gas torch there TBH. It's hard to be precise enough whilst also getting enough heat in and it'd be easy to ruin the upper seals on the gearbox/waterpump area.

TIG would be best. I had a similar repair done on my Bravo drive once and the job was perfect, plus with only localised heat, we didn't need to dismantle the drive.

Otherwise, I also used JB weld once on an outboard - it's a non structural piece there - and it held up just fine.

[Dino89]

got rods on order coming but messsed about with a coke can and it melted very easily !! ,
looking around tinternet i reckon jb weld would do the job any one else used this and add fins as suggested above , did look at this youtube and jb weld is quiet impressive

https://www.youtube.com/watch?v=H4xX7VecgzA

edit: just see you suggested jb weld Matt what did you use it on ? did it last as a perm fix ?

[paintman]

I've used JB Weld on quite a few things & found it very good, but never tried it in an underwater application.

[Matt]

It's fine. I had some Keikhafer trim tabs once that had corroded and cracked the hinge casting. I JB Welded (And tapped and drilled too) the hinges back together and it all worked very well.

[Dino89]

went with the safest option today and used jb weld , thanks for all the responses will feeedback how it goes