1987 Lund Tyee 5.5 Restoration

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red91sit

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Hey y'all,

I used to have an old mid '60's tri-hull, and drove it all along the Mississippi. Being fiber glass and wood (and 50 years old) it was pretty much shot, so I parted with it. Ever since I've wanted another boat, que the swamp ape.

This 1987 Lund Tyree 5.5 was listed locally, and picked it up on October 5th 2019.

I'll add more posts as I work on it.

Pictures below are after pressure washing it (was super gross before this gunk all over the carpet).
 

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Back deck is out, rot around the edges, the middle was still quite sturdy, just water logged.

Need to pull out the studs still.

The foam is all dry top to bottom in all 3 test bore locations, but I think I'm going to pull it out anyway. It's moldy, and I'd prefer foam boards that can drain should water get under the deck.

Next up, copy the old board patterns to new plywood. I think not sure if I'm going to keep the rear seats, as I'd prefer a little bench seat back there.
 

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Turns out the water was coming from up front, not the back as I expected. Mold starting at the floor coming all the way up the walls.
 

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LDUBS said:
I like that style of boat. It is going to be a big roomy boat when you are done.

I look forward to watching your progress.

Thanks for sharing.

Thanks LDUBS, if you don't see a post from me for a while remind me to get back to work :-D

I think I'm going to keep the foam after all, borrowed the better half's good bread knife and took a full section out. A little water beneath the foam, but no soaked foam. It's like a capillary thin layer of water.

I heard others mention there floor was held in with steel screws, and the aluminum panels have inaccessible lock nuts.... They're 100% correct. >:-(
 

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No exciting pictures tonight, but I did break the teleflex loose, and packed it as much lithium grease in there as I could.
 

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Looks like you got a diamond in the rough there. Big & little merc brothers! I had same 80 hp merc, don't be surprised if the carb floats are gas-logged. My boat had pinholes in the keel (from beaching, worn thin). So check that out as a possible leak point. Also check the transom for rot, I rebuilt mine from the inside (had to lift the cap).
 
CedarRiverScooter said:
Looks like you got a diamond in the rough there. Big & little merc brothers! I had same 80 hp merc, don't be surprised if the carb floats are gas-logged. My boat had pinholes in the keel (from beaching, worn thin). So check that out as a possible leak point. Also check the transom for rot, I rebuilt mine from the inside (had to lift the cap).

Thanks Mr. Scooter,

My old blue boat had the 80hp, and had the exact same issue. I plastic welded the float back together, and it lasted until I was down steam from my boat launch on the Mississippi, and up steam from a dam. After 3 hours paddling up steam, I decided not to do that again. This one is actually a 90hp 6 cylinder, and if it's bad, the last boat I had came with a spare 85hp Mercury. Maybe I'll go crazy and and do an 85-90 dual motor setup instead of the 9.9 😆

For the transom, any easy way to check this without complete disassembly of it? I can't see any wood looking towards the back, knock test sounds solid.

Progress update
Carbs cleaned
Rear floor panels cut, and 1st coat of sealant applied
Vacuum'd the poo out of the front, it's looking good enough for now.

Next up
Lower unit oil change
Impeller change
Test motors
 

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Knock test for transom rot is a good one. Also if it doesn't flex when you tilt the motor, that is also a good sign.
Are you still in the Mississipi valley? I am orig. from Quad-cities & have great respect for 'ol man river.
 
CedarRiverScooter said:
Knock test for transom rot is a good one. Also if it doesn't flex when you tilt the motor, that is also a good sign.
Are you still in the Mississipi valley? I am orig. from Quad-cities & have great respect for 'ol man river.

Hooked up a car battery to it tonight, power trim works, forget how aggressively quick it moves. Leaks a bit, but didn't see any transom flexing.
I was up in the Wisconsin/Minnesota/Iowa corner, but now I'm down in central Florida. That Ol Man river is a force for sure, submerged trees, wing dams, and giant barges taking up the whole channel while throwing a massive prop wash all the way to the shore.

Progress update
Rear floor panels are all spar vanished up, some how, I put more $ of varnish on these, than the plywood originally cost.
Weather radio works, I picked up a broadcast from the coast guard, they found an un-manned vessel near the space coast (Raytheon unit with a big antennae).
Most leftover floor screws removed or ground level.
 

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Screws all flattened out, cleaned the bilge, removed a few pliers, sunscreen containers, lures, and weights.

Dry fitted the new floor, the under floor braces are highest in the middle, so the new floor is either going to be bowed on both sides, or I'll have to shim it.

9.9 started right up, the 90 sputters when choked, but won't start.

Electrical is mostly good, depth measurer harness is chewed or corroded through.
 

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90hp fired up, bad water pump and one carb has a leak in it. Swapped the pump last night.
Navigation lights work.
Original radio works but needs to be wired in.
Lower unit water flushed out and refilled... Saving my pennies for a future rebuild.
Carpet is here, decided on gray to avoid a sea of mismatched reds currently in there.

Needs before going out
Bench seat
Carpet install

Future fixes
Testing of bilge and aeration pumps
Separate fuel and battery for little motor (make fully redundant)
 

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My assistant helped me get the radio wiring hooked up to the electrical panel.
 

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Carpet is in, accidently made this into a press fit. I think the original carpet didn't wrap around the outside edges of the wood. Whoops.

Also, any easy/quick way to clean seat bases?
 

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Progress so far looks great - picked up an '83 Lund WS-16 in September and have been going through the same kind of work working through deck rebuild. I'm trying to avoid the kind of hardware rot that you and I are both seeing.

I'm not planning on putting carpet in mine, but that red interior is looking good.
 
Took it for a spin last weekend, didn't have the seats installed, so I threw a lawn chair in there and took it out. Runs good, got it up to about 30mph and some how dinged up a perfectly good prop.

After that outing, the boat mouse decided to vacate the boat, and is now in my attic.

This weekend;
Installed the seats and bases
Performed black magic on the carbs to improve idling
Put mouse traps in attic
Rewired trailer lights, now LEDs
Bilge and aeration pump work

Future fixes
Separate fuel and battery for little motor (make fully redundant) or buy seatow policy
New roller to keep keel off trailer
Repaint trailer
Fuel injection conversation for 85hp Mercury using Honda parts and chipped p28!?
 

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Took the family out the other weekend, worked great.

Re-plumbed fuel to have separate fuel shutoffs so I can drain the carb bowls via the engine at the end of the weekend, and reduce the flooded float bowl when I prime one when the other is still tilted up.

Other than that, she's ready for winter. I'll keep posting updates as work continues, but that may be a while away.
 

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LDUBS said:
Wow, that water looks calm.

Anyway, I trust she loaded up that Barbie reel with some high test braided line!

:LOL2: yeah I need to give it an upgrade, I swear it came with .5 lb test line. For the water yeah, that lake is super flat most of the time.
 

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