85 Crestliner 16 Rebuild

[eboat85]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

On most tinnies those rivets go through the transom and the ouside skin
From the one pic of the outside of your transom that you posted I can't tell if yours do or not.

All you can do is just keep taking stuff apart until you can get that booger out of there, it may put up a pretty good fight but I know you can whip it.

Hi Jig, here is a pic of the outside of the transom. The rivets don't go all the way through. My thought is that the transom wood, cap plate and splash well plate were lowered in as a unit and then welded and bolted in place.

I think the next step is to cut out more foam in the back corners of the bilge so I can see the full length and access the project before grinding any welds. Just drilling the the rivets doesn't look like it will get the plate out but I am not 100% sure either way yet.

One thing I do know is that I have a lot of foam to take out. Is there spray foam out there to replace it when I'm done?

 

[jigngrub]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

The foam options are numerous. Spray foam, pour in foam, block/sheet foam, and any combination of the 3 I just listed.

Which foam and method will be best determined when you get everything out and we see what you have to work with as far as location and access.

 

[eboat85]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

The foam options are numerous. Spray foam, pour in foam, block/sheet foam, and any combination of the 3 I just listed.

Which foam and method will be best determined when you get everything out and we see what you have to work with as far as location and access.

Sounds like a plan. First I have to get there. After removing the foam from the transom area I will have a better idea of what step to take next. I don't want to jump to conclusions until I find all the braces.

One thing I can tell for sure is that Crestliner wasn't too concerned about water getting to the wood and into the bilge. I will bemusing a lot of 5200 to seal things up when it all goes back together.

 

[jigngrub]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

Encapsulate your wood in epoxy resin and 5200 all the penetrations and you'll never have to worry about it again.

It looks like you have foam against your transom wood in the pics, this is a design flaw that we've seen on here. There should be an air space between the 2 for drainage.

 

[eboat85]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

[QUOTE=jign

Jig, The transom wood isn't in contact but the panels on the side of the bilge area as is the panel that the battery sits on.

I plan on replacing the bottom piece since it is pretty well covered with oil from the VRO oil tank that was mounted there. I will have plenty of left over 3/4" plywood from the transom that I should be able to make a nice subfloor piece.

I think that once I clear out more foam I should be able to file down the welds on the uprights and lift the splash pan/transom cover out as a unit. I have been trying to think how it was put together and that seems to make the most sense to me.

 

[eboat85]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

How much Epoxy do you think I should get for the transom? I would hate to place an order and come up short. Here is the information that was on US Composites web site. I take it that it is brushed on. Thanks!

US Composites has their 625 Medium Epoxy

3:1 Ratio Medium Epoxy & Hardener

EPOX-635311
16oz 5.3oz $15.75
EPOX-635312
Quart 10.6oz $23.95
EPOX-635313
1/2 Gal 21.3oz $39.75
EPOX-635314
Gallon 42.6oz $71.00

 

[Woodonglass]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

1/2 Gallon should be plenty IMHO

 

[jigngrub]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

The half gallon kit will be plenty with some leftover probably, but that stuff comes in handy around the house to and is kinda fun to play with.

Don't forget to order the pumps too, makes measuring quick and easy. You may also want to pick up a quart of Cabosil, phenolic micro ballons, or SM fairing powder for making adhesives and fillers too. I use the SM fairing and it's only 44.60 a quart.

 

[eboat85]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

PROGRESS!!!

Well, I have the wood out and the assembly was what I had drawn up a few posts ago.

It was a battle and I spent a couple of hours cutting foam and moving wires but it is out. Had to loosen the entire splash panel assembly, remove the rear corner U-bolts and then lift the assembly about 10" and then it pulled forward enough to lift the wood out while the rest stayed in the hull assembly. It might not be the best way but it is out. There are five supports that extend to the bottom of the splash panel and the middle one had a broken weld to the top and the other four were loose at the bottom. I am not sure if they were ever welded.

The wood is 2" thick and the people at Crestliner put in two 1" sheets and called it good. There is no sealing or coating that I can see and the panels even have the football shaped patches so it isn't even a top grade material. As you can see, the board is warped and collapsed on the edge. It didn't fall apart but I am sure that it's stronger days was long ago.

The rest if what I found looks pretty good. The foam around the fuel tank is undisturbed and dry and the deck is solid. I plan on flushing out the tank, replace the sending unit and probably some fuel lines and button it back up. Anyone want about six gallons of old gas?

Now for my questions:

I was expecting to find two sheets of 3/4" plywood. Would it be best to use two sheets of 3/4 with a sheet of 1/2 in the middle or go with two sheets of 1"?

Also, were the bottom of the engine mount was pushing against the exterior of the transom there is a bend in the plate. Any suggestions on how to straighten this out. I was thinking about using a rubber mallet on the inside to see if it would pop out. Maybe it is best to just leave it since the top edge will be back in the correct place with the new transom plate.

All in all a good day - now it's time to start learning my woodworking trade. Thanks everyone for all your help.... if I hadn't made contact with you folks I never would have had the nerve to dig into this!

 

[eboat85]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

Here are a few more pics.

The first one shows the engine mounted and the pressure that is pushing on the lower edge that caused the denting that I brought up in the last post.

The other pic shows how close the bottom engine mounts were drilled to the edge of the wood. I am thinking that it might be better to just cut a U shaped slot to the edge of the wood instead of leaving the thin edge. I am not sure but and thinking about it.

 

[jbcurt00]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

I'd use 2X 3/4" & a 1/2" in the middle. I doubt I could even find 1" ply w/in 5hrs of the house. In Wisconsin, you're results might be different.

Build the new plywood transom & install it, the deflection at the bottom of the motor bracket doesn't look too bad...

I wouldn't try to hammer the dip out, it might make the problem worse, in the other direction.

Is there clearance on the inside to allow the transom ply to stick down further below the motor mount hole? Adding another inch or 2 would give you better bearing for the thru bolt's washer...

Your graphic doesn't show a 'shelf' like many SC's have to support the bottom of the plywood transom:

 

[eboat85]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

I'd use 2X 3/4" & a 1/2" in the middle. I doubt I could even find 1" ply w/in 5hrs of the house. In Wisconsin, you're results might be different.

Build the new plywood transom & install it, the deflection at the bottom of the motor bracket doesn't look too bad...

I wouldn't try to hammer the dip out, it might make the problem worse, in the other direction.

Is there clearance on the inside to allow the transom ply to stick down further below the motor mount hole? Adding another inch or 2 would give you better bearing for the thru bolt's washer...

Your graphic doesn't show a 'shelf' like many SC's have to support the bottom of the plywood transom:

JB, the picture has a part listed as the Transom Top Plate. The plate is actually a "C" shaped channel that covers the plywood on the top and wraps around the back and then tucks under the bottom. It is open on the ends but not the bottom.

I was thinking that going with three panels glued and screwed together would increase the strength but also wondered be too thick by the time I glued the three pieces together and then added the epoxy.

 

[jigngrub]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

Yeah, 2 pieces of 3/4" and a piece of 1/2"... or you can use 4 pieces of 1/2", whichever you can get the best deal on.

The football shaped patches on the old wood designate a "B" grade face and you should try to find BCX grade or better plywood to build the transom out of.

The stout new 2" chunk of wood should straighten out any irregularities with the transom framing, you may have to do a bit of prying to get it into place but once it's there all should be good.

 

[eboat85]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

The only repair for a bad transom is to replace it.

Jig, I am glad I followed your comment when I placed my first post. That piece of wood had definitely seen it's day a long time ago. It was a real trick getting it out but now that I know the way I can start putting it back together.

I am still wondering if I should pull the tank to rinse it out or just suck it dry and replace the sending unit. I don't suspect any contamination, just old gas.

I will probably order both the 3/4" and 1/2" from the local Menards lumber. They can get it within a week for a small charge. I wouldn't mind having some extra 1/2" to remake the deck for the battery storage and side panels.

 

[eboat85]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

Well, things are starting to come together. In the last week I have either ordered or bought plywood, epoxy, bilge pump , perko switch, cables, 5200, drain tubes, TB III, and a ton of hardware. Hopefully this weekend I will get the transom built and the fuel tank out and cleaned. Once the epoxy arrives and applied I can start putting things together.

I am going to replace all the wood panels in the bilge area with dome of the leftover plywood. After I epoxy it I will paint it for uv protection. The guy at US Composites said some people have been painting over the epoxy with the aerosol truck bed liner paint. Any other suggestions for a durable paint for covering epoxy?

 

[eboat85]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

Well, things are starting to come together. In the last week I have either ordered or bought plywood, epoxy, bilge pump , perko switch, cables, 5200, drain tubes, TB III, and a ton of hardware. Hopefully this weekend I will get the transom built and the fuel tank out and cleaned. Once the epoxy arrives and applied I can start putting things together.:joyous:

I am going to replace all the wood panels in the bilge area with dome of the leftover plywood. After I epoxy it I will paint it for uv protection. The guy at US Composites said some people have been painting over the epoxy with the aerosol truck bed liner paint. Any other suggestions for a durable paint for covering epoxy?

 

[jigngrub]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

Durable is this stuffs first name:

Non-slip Safety Coating for Your Boat or Ship

I'm dying to try this stuff out and am thinking about doing the exterior of my hull with it some day.

 

[eboat85]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

Durable is this stuffs first name:

Non-slip Safety Coating for Your Boat or Ship

I'm dying to try this stuff out and am thinking about doing the exterior of my hull with it some day.

That looks like pretty good stuff. Too bad they don't show pint or quart sizes. With the area that I want to do most of it would go to waste.

 

[jbcurt00]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

Not if you sub it for a deck coating too.

 

[eboat85]

Re: Warped transom - Replace or Repair?

Re: Warped transom - Replace or Repair?

Not if you sub it for a deck coating too.

It would get my carpet all messy!:laugh: