1987 Blue Fin S170 Rebuild

Shife

Chief Petty Officer
Joined
Oct 22, 2009
Messages
404
The season is over for me so it's time to start pulling this thing apart. I purchased the boat in August for $1000. For that I got the boat, the '87 B series Force 50 hanging off the back, a galvanized tilt trailer, a bow mount 36lb Minn Kota Powerdrive, an ancient Humminbird fish finder, and what looked like the remnants of a mice infestation.

A friend and I towed it to my house and set to work on getting it running. The boat hadn't been in the water since 2002 and prior to that was only used a few times per summer, always kept on its trailer. The scum line you see on it now is from sitting in the water behind my house for 3 months (I'll be putting antifouling paint on the bottom). The bulb, fuel line, and fuel tank were original and shot. A quick trip to the hardware store scored us a new plastic tank and a new fuel line and bulb. The battery was toast, but a friend had just given me 2 near new deep cycle group 27s from his other boat. Shockingly, it started instantly. Enthused by this we decided to put it in the water the next day.

After trailering it to the launch ramp and putting it in, I started it and my friend drove the trailer back to my house. I opened up the throttle and things seemed pretty good. For about 2 minutes... Then it started losing power. I was able to get it back to my house where it would have to sit for a couple weeks (I distance race sailboats during the summer). Once home I set to work cleaning out the fuel recirc system and checking through the shop manual for fuel delivery issues. I had seen a thread on here mentioning decarbing and picked up a can of deep creep. That was the ticket. It instantly ran better. After adjusting the points (which need to be replaced) it ran great the rest of the season.

The boat has the usual problems. The bilge pump was shot and had to be replaced. The livewell pump is also shot and now that it's out of the water I can put a new one of those in. The deck is soft in a couple spots and needs to come out. The casting deck also needs to be replaced and the hatches reworked. The seats are okay, but the vinyl is starting to get brittle so I'll probably replace those with a more fishing friendly solution. The wiring is what you would expect for a used boat. There are no leaks cracks or dents in the hull. All the rivets seem tight but i'll be coating with Gluvit after the deck is out anyway. I can only guess what kind of shape the foam is in, but from the signs I've already seen it is half chewed up and soaked with water.

So far I've got the gearcase off the outboard and drained. I'm also pulling off the Minn Kota to keep it in the basement for the winter. I'll probably remount it with a quick release plate before I put it back on. That thing has been amazing for fishing on my lake. I'm hoping to get most of the interior out tomorrow and then start working on pulling the deck out. before the snow starts coming down.

I don't plan on making this a Bristol refit. It's a fun little boat, but I'm not looking to create a museum piece. The topsides paint will remain as is for now. The carpet on the gunnels will stay as well unless I end up having to pull all that trim off. The deck may end up being foam or balsa with glass skins as I'm familiar with that method of construction and I want to reduce weight where possible. The decking will probably be coated with Kiwi Grip as I have 2 gallons of it in my basement from one of the boats I race on. The consoles will be elevated at least 3 inches as they are way too low right now making steering uncomfortable. The engine will get torn down and re-assembled for reliability, but I'm on the lookout for something bigger as the 50 just doesn't have enough juice once the boat is loaded down with a few people. It's fine for my lake, but if I take it up to the cabin on Houghton Lake or over to Lk. St. Clair the 50 would be over worked. The bottom will definitely be getting a barrier coat and antifouling paint since my lake is pretty shallow and the boat will be living in the canal behind my house.



Enough blabbering. On to some pics.
 
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Shife

Chief Petty Officer
Joined
Oct 22, 2009
Messages
404
Re: 1987 Blue Fin S170 Rebuild

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Steve Mahler

Petty Officer 1st Class
Joined
Oct 10, 2006
Messages
361
Re: 1987 Blue Fin S170 Rebuild

my kind of boat, and my kind of rebuild. i love simple fishing boats, and sounds like you have a great plan. l also like chrysler (force) motors, and agree you need 70-90hp on that boat for ideal power.

Post pics of progress!
 

ezmobee

Supreme Mariner
Joined
Mar 26, 2007
Messages
23,767
Re: 1987 Blue Fin S170 Rebuild

Nice boat. Good luck with your project.
 

Bob_VT

Moderator & Unofficial iBoats Historian
Staff member
Joined
May 19, 2001
Messages
26,064
Re: 1987 Blue Fin S170 Rebuild

If you are going to trailer that boat save your money on the anti-fouling paint and use normal paint ;)

Looks like a Starcraft SS :)
 

Shife

Chief Petty Officer
Joined
Oct 22, 2009
Messages
404
Re: 1987 Blue Fin S170 Rebuild

If you are going to trailer that boat save your money on the anti-fouling paint and use normal paint ;)

Looks like a Starcraft SS :)

Thanks for the encouragement, guys.

The boat will live in the canal behind my house, which is why I'll be applying a barrier coat and antifoul paint. It is a shallow lake that gets fairly warm.
 

wa_ssv197

Petty Officer 1st Class
Joined
Apr 6, 2009
Messages
266
Re: 1987 Blue Fin S170 Rebuild

My father has the same boat, he purchased it new.
I learned how to ski behind that boat and by the time I was 13 I was pulling the back end of the boat while cutting across the wake. And with just two of us in the boat top speed was 35 (off the spedo). Good little boat, never had any issued with it.
 

Shife

Chief Petty Officer
Joined
Oct 22, 2009
Messages
404
Re: 1987 Blue Fin S170 Rebuild

Not a lot of progress, but I should have the rest of the floor out tomorrow. The decking was pretty much as bad as I thought it would be. The foam in the hull looked okay at first, but a decent amount has soaked up water. The construction of the livewell surprized me as it is fully welded. I expected some type of seam sealer and spot welds.
 

Shife

Chief Petty Officer
Joined
Oct 22, 2009
Messages
404
Re: 1987 Blue Fin S170 Rebuild

Interior is stripped and cleaned. All the floor decking panels have been cut and test fit. Just need to wait for the epoxy to show up now. I decided to just use 1/2in exterior plywood instead of doing a composite floor. The wife wants to buy a new boat soon so dumping $700 in materials to save 100lbs on a boat that I don't plan on keeping doesn't make much sense. I'll still skin the plywood with 10oz cloth to give it some impact resistance.

A trip to Cabela's yielded a Johnson Mayfair cartridge livewell pump to replace the fried Atwood that was in there. I also picked up a Eagle 350c sonar to replace the ancient relic that was on the dash. I'm really glad I pulled up the floor as the drain hose for the livewell has cracks in it. The pump hose for the livewell also had a nice cut in it presumably from when they built the boat as it was in an area that was inaccessible once the floor was in. Every time the livewell pump would have been turned on this thing would have been spraying water all over the bilge.

Sorry about the lack of pics. I'll try to grab some tomorrow.
 

Shife

Chief Petty Officer
Joined
Oct 22, 2009
Messages
404
Re: 1987 Blue Fin S170 Rebuild

Got around to mounting the sender for the sonar and the livewell pump. Also scored a tin of Gluvit for $18 at a local marina.
 

geeco1

Petty Officer 1st Class
Joined
Jul 16, 2009
Messages
373
Re: 1987 Blue Fin S170 Rebuild

Hey Shife,

Other than a few cosmetic differences, your boat looks very similar to mine.

One question... when you tore into the bow decking, did you have a smaller triangular piece of decking that was in the bow, but about 3 or 4 inches below the main decking? If so, do you know what that was for? I assume it was for added impact resistance on the front of the keel, but really not sure.
 

Shife

Chief Petty Officer
Joined
Oct 22, 2009
Messages
404
Re: 1987 Blue Fin S170 Rebuild

Ha! Yep, I found the same piece. I assume it is to provide additional stiffening in the bow. I was pretty surprised to find it. Mine was still in perfect condition so I'm just going to throw a coat of epoxy on it and toss it back in.

Our hulls are pretty much identical. Only difference appears to be the bow setup.
 

Shife

Chief Petty Officer
Joined
Oct 22, 2009
Messages
404
Re: 1987 Blue Fin S170 Rebuild

Rivets and seams are all sealed. Started tearing down the engine and found that the cylinders still have crosshatching in them. Found a couple of reed petals aren't sealing so I ordered a set of Boyesen reeds. Should have a bunch of engine gaskets, ignition parts, water pump, and epoxy showing up later this week.

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