will this work for a stringer replacement for a v8 engine?

[lime4x4]

The darker wood is one of my boat stringers. It was made out od a solid peice of wood. The lighter colored one is my idea for the replacement. Someone said to laminate plywood together but i have 2 lag bolts for the motor mounts.

 

[BobsGlasstream]

Re: will this work for a stringer replacement for a v8 engine?

lime4x4,
I'm sure that it would work, for at least awhile.
I'm not a fan of pine, if that's what it is.
I would make sure that it is sealed and glassed well.
I would use a different type of wood myself.
I have a piece of 2" X 12' Engineered lumber that is left over from when my house was built, I plan to use.
Have fun
Bob

 

[83vert]

Re: will this work for a stringer replacement for a v8 engine?

Check out the mounts that Thrillhouse700 just made up.

 

[vegasphotoman]

Re: will this work for a stringer replacement for a v8 engine?

my 2 cents........
Im sure it would hold.....but the more joints = more chance of future cracks in your fiberglass and eventual water intrusion...use a monster lag perhaps going down at the center countersunk with a washer? to help hold it all down to the stringer and use EPOXY to glue it all to each other. should hold well

I might go with 4x4 wood so there's less joints ...mebbe pressure treated

one oughta do ya...about $13 @ HD

 

[lime4x4]

Re: will this work for a stringer replacement for a v8 engine?

yeah i was thinking of using a 4x4 for the bottom portion then using 2x4's for the top plate. Screwed fast and epoxied together. My concern on using pressure treated is i heard epoxy doesn't really soak in compared to untreated. Also the original stringers were coated with a 1/4 inch of glass. The stringers soaked up water thru the rotted out transom

 

[erikgreen]

Re: will this work for a stringer replacement for a v8 engine?

I wouldn't use pine. If you're going to use dimensional lumber, you need to use something more solid, like ash, or if you want rot-proof, use one of the imported mahogany substitutes.

Plywood will work fine for those lag bolts, and be stronger than any of the dimensional wood. Just make sure for the places the bolts will go that the plywood is horizontal rather than on edge. Laminate a few pieces together. As a bonus if you put a layer of glass in between these pads and the rest of the mount, even if they rot the rest won't (water can't wick through).

Don't forget to seal around the lag bolts with 3m 5200 or similar, otherwise water gets in around the bolts.

Erik

 

[lime4x4]

Re: will this work for a stringer replacement for a v8 engine?

Well if i go with plywood. I was thinking i would just set the engine back in. Then mark were the engine mounts get bolted. Remove the engine. Drill an over size hole. Then install a ss bolt (head first) and epoxy the hole and bolt. Never have to worry about water intrusion and also all the peices of plywood can be vertical and it shouldn't matter

 

[BobsGlasstream]

Re: will this work for a stringer replacement for a v8 engine?

lime4x4,
If you epoxy the bolts in, I would add wings on the bolts to prevent them from turning. Not hard to do and good insurance.
My 2 cents.
Bob.

 

[Bondo]

Re: will this work for a stringer replacement for a v8 engine?

Then install a ss bolt (head first) and epoxy the hole and bolt. Never have to worry about water intrusion and also all the peices of plywood can be vertical and it shouldn't matter

Ayuh,... How ya gonna change that bolt when you Wack it puttin' the motor back in,..??
Bad Idea...

Fill that hole with peanutbutter,+ drill it for the lags...

Make sure you hang the motor off an alignment bar to set those motor mounts....
Getting the "Final" position has gotta be Real, Real close....

I'd build stacked ply mounts,... horizonal pieces, stacked to grade...

Or you could go with the Boiled White Oak ya took out......

 

[swordfish25]

Re: will this work for a stringer replacement for a v8 engine?

I would go with the hardwood also, soft wood strips out to easy,and soacks up moisture to easy.

 

[lime4x4]

Re: will this work for a stringer replacement for a v8 engine?

Correct me if i'm wrong here. But once the 2 rear engine mount bolts are bolted to the transom plate. The frt ones are going to have to be put were ever there sitting. Correct? So your saying build the first 4 inches of the stringer verticaly then add the 3 inch mount horizontly?

 

[erikgreen]

Re: will this work for a stringer replacement for a v8 engine?

Correct me if i'm wrong here. But once the 2 rear engine mount bolts are bolted to the transom plate. The frt ones are going to have to be put were ever there sitting. Correct? So your saying build the first 4 inches of the stringer verticaly then add the 3 inch mount horizontly?

Once the motor is on the rear mounts it won't move port-starboard, but it WILL (and is designed to) move up and down. You need the alignment bar to make sure it's at the right height or close to it when you build the permanent mounts.

Horizontal/vertical works, or you can stack up horizontal ply pieces on the bottom of the hull till you get the right height.

For my new front mounts I'm going to glass a stack plywood to the hull I think.

Erik

 

[Bondo]

Re: will this work for a stringer replacement for a v8 engine?

Once the motor is on the rear mounts it won't move port-starboard, but it WILL (and is designed to) move up and down. You need the alignment bar to make sure it's at the right height or close to it when you build the permanent mounts.

Ayuh,... You've got my meaning,...
But,...
Even though there's not much play in the Rear mounts, there is Some, both vertically,+ Horizonally....
Hence the Importance of centering on the Alignment Bar, before setting the forward mounts...

 

[erikgreen]

Re: will this work for a stringer replacement for a v8 engine?

Ayuh,... You've got my meaning,...
But,...
Even though there's not much play in the Rear mounts, there is Some, both vertically,+ Horizonally....
Hence the Importance of centering on the Alignment Bar, before setting the forward mounts...

Oh, okay, sure. The transom plate mounts aren't *supposed* to adjust side to side, but because they're shock mounted in rubber donuts it's possible to move them a little. So you could get the drive aligned badly side to side.

I suppose that would mean one of the shock mounts would be pinched tight, and the other stretched to its limit, which I'd think would keep both from working right...

Erik

 

[Bondo]

Re: will this work for a stringer replacement for a v8 engine?

So you could get the drive aligned badly side to side.

Ahhhh, Nope,.... The Motor will be out of alignment....

You're aligning the Motor to the Gimbel,...
The Drive slides in After...

But you knew that anyways......

 

[erikgreen]

Re: will this work for a stringer replacement for a v8 engine?

Ahhhh, Nope,.... The Motor will be out of alignment....

You're aligning the Motor to the Gimbel,...
The Drive slides in After...

But you knew that anyways......

Yeah. I was trying to type fast so I could go get another shirt... I washed the one I was wearing with my fiberglassing clothes. It felt worse than wearing raw wool underwear.

Erik