Grumman transom - the good , bad and the ugly

[Shallowman]

I pretty much decided to give up on the boat cause of this. Today i thought i should go ahead and see how bad it is .
The good was i got the rivets out easy.
The bad is after removing a steel plate ( 50 lbs or so ) i seen how beat up the alum really is on the boat.
The ugly is exactly what i thought the wood looked like --- horrible ---

I feel comfortable doing the wood the correct way , I'm STILL concern on how flimsy , warped , corroded the alum is . Perhaps with the new wood is place i can get it back to sitting flat .

I can clean the alum best i can and give it a shot , What do you think ?

 

[dude11]

Re: Grumman transom - the good , bad and the ugly

It don't look bad to me--the wood in my transom,you could carry in a 5gal.bucket.

 

[reelfishin]

Re: Grumman transom - the good , bad and the ugly

That's about what I was thinking, on mine, I used a vacuum cleaner and a screwdriver to get rid of the old wood. Most had fallen off just by touch. Then I cut all the rusty bolts.
The aluminum had some pitting, but none was through, I sanded it lightly, spot blasted the bad spots and filled with marine tex then I primed it with self etching zinc chromate primer and gave it a coat of white enamel. I remade the wood panel, coated it in epoxy with a layer of glass in between the panels and added an aluminum plate where the motor clamps sit.

I replaced all the through bolts with stainless pan head screws and nylock nuts, sealed with some 5200. I suppose it will out last me now.

Unless your transom panel is so thin you can't rebolt in the wood for some reason it should be fine, seal up any holes with marine tex or Devcon aluminum putty and give it coat of self etching primer and some paint to help prevent any further corrosion. Do not use pressure treated wood. I used a good 7 ply grade ACX, which was so perfect looking it could pass for cabinet grade plywood.

 

[Shallowman]

Re: Grumman transom - the good , bad and the ugly

Pushing forward . I took a few pictures .I sanded , cleaned , prepped the bad spots on the underside of boat . I decided to use marine-tex to fix these spots . As a final prep i roughed spots up with 80 grit paper , then reprepped with cleaner.
I've never worked with Marine-Tex but it is fairly simple .... BUT messy . I thought it would begin to set faster so i applied it slightly larger areas then needed . Next time i'll know i have alittle more time and can save me some sanding .
I did alittle on the transom and it still has me worried some . Without the wood in place its got lots of holes and corrosion spots . Ive decided however to move forward , i'll have a 9.9 motor on it and i think if i fill the holes and add a plate over the rear transom area i'll be ok . I'll just have to fiqure out how to seal the stainless to the alum.

Close up of the spots in picture above:

 

[craigjudge]

Re: Grumman transom - the good , bad and the ugly

Never did any aluminum hole repair but I did the transom wood on my 64 Grumman this summer. Took me about one day. I used a solid 2x10 and ran it through the planer a dozen times rather than use plywood. I think it looks better and was 1/4 the price.