rotten motor mounts

[boatguy19]

hi all, i have a 1990 wellcraft 20' with a 4.3. about 4 years ago i completely gutted the boat and did it over 100 %, there was nothing i didnt touch. i put new stringers in and bulk heads and a new deck and new foam the transom was solid, what i did not do was put new motor mounts in. at the time they looked good.

last year i noticed that they were a little mushy and somehow the alignment was still good. there was a hole on the side of the box, reached in and started to pull out some rotten wood now i have to pull the engine and do these over. my questine is what type of wood do i use and how do you go about doing these. im a carpenter so the wood work is not a problem for me.

how do you attach them, is the wood attached to the stringer by screws or another way. is the wood suppose to touch the fiberglass on the bottom or no, if not do you some kind of bedding. the boxes are about foot and a half long and about ten inches high. dont ask for pictures cause i dont have any my camera disappeared. thanks for any help in advance.

 

[Bondo]

Re: rotten motor mounts

Ayuh,.... Generally speakin', the wooden boxes/ blocks are fiberglassed into place...

The fiberglass is the bond, rarely are fasteners used...

 

[81 Checkmate]

Re: rotten motor mounts

Here is what i did.... Used 3/4" plywood to make the shape then glue together to make the width, then PL glued down to boat hull, then glassed in.

 

[pauloman]

Re: rotten motor mounts

large engines, like turbines in power plants, essentially sit on epoxy sand (epoxy cement) -

 

[mbasonic]

Re: rotten motor mounts

boatguy19,

I replaced my engine mounts which I believe are similar to the boxed ones you are describing..... I did all this without pulling the engine, and I feel really confident that I did all this without ruining any engine aligment. Of course....I poured my engine mounts using nida bond. I made a support that goes under the engine and braces against the hull while I cut the old mounts out. One mount replaced at a time. I left the existing piece of fiber glass against the metal bracket for one side of my pouring mould. The nida bond glued itself to the existing fiberglass. I basically glassed around the rest of it.. Take a look at my thread. http://forums.iboats.com/boat-resto...cs-560333.html?highlight=stringer+deck+attach Maybe this will help you out. I don't think you could replace them without pulling the engine if you were going to use wood though.....

Matt

 

[mbasonic]

Re: rotten motor mounts

What's your plan on those motor mounts? Any progress?


Matt