Just Bought 1973 Cobalt Need Help!!!!!

Wvawitrado

Petty Officer 3rd Class
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Jun 10, 2008
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80
Hey guys trying to get in touch and learn about boating I am very serious and ready to invest because I want to keep her I will be getting some pictures up she is 1973 cobalt tri hull mercruiser straight six i got her for 1800 in good working condition just wanting to know how to fix some stuff on it I screwed a battery screw through the bottom is that fixable?!?!?!?! and also I wanted to seal the outboard replace the floors carpet and can you recondition upholstery??? Its in great shape just a little weathered....PLEASE HELP!!!
 

tashasdaddy

Honorary Moderator Emeritus
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Nov 11, 2005
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51,019
Re: Just Bought 1973 Cobalt Need Help!!!!!

your outdrive and motor questions need to be ask in the inboard/outboard forum. sure you little hole can be patched with Marine Tex, or with 3m 5200, but 5200 take 10 day to 2 weeks to cure. or JB Weld Marine, 2 days to cure.
 

PowerAddict

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Aug 8, 2007
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Re: Just Bought 1973 Cobalt Need Help!!!!!

I too have a '73 cobalt tri-hull.

Sure is a good boat. My hull, floors, seats, everytghing is in excellent shape. Have had it less than a year but so far soo good.

Mines got a 140 in it, is yours the 18'?
 

Wvawitrado

Petty Officer 3rd Class
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Jun 10, 2008
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Re: Just Bought 1973 Cobalt Need Help!!!!!

yeah sure is the 18' it has a mercruiser straight 6 165hp in it. The upholstery has no rips is there any way to revive it? I have to replace one board but other than that she is sweet.....Was 1800 too much?
 

PowerAddict

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Re: Just Bought 1973 Cobalt Need Help!!!!!

I bougt some marine upholstery cleaner from the boat store, it cleaned up the older vinyl really well. Also, those mr. clean magic erasers work wonders!!!

I also buffed the exterior with some marine buffing compound by 3m, it got it shining like new, it was very dull and dingy before.

I think we'd all love to see some pics!

oh, I wouldn't say $1800 is too much if runs, the outdrive's good, adn the transom's solid.... but I wont' tell you what I paid...
 

Wvawitrado

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Re: Just Bought 1973 Cobalt Need Help!!!!!

Im going to have pics up as soon as i can probably tomm. maybe a day later at MAX!!! Thanks for the input on the buffing I think it would really liven it up the condition is higher than average I plan on investing a lot I want to keep her FOREVER!!!! LOL ..... It runs good and I feel like a knucklehead but whats a transom?
 

Wvawitrado

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Re: Just Bought 1973 Cobalt Need Help!!!!!

So for instance cause I am a new boater If I had to replace the floors and transom and all that whats that looking like? I would like to do it myself...So on the cobalt the transom is a piece of wood?
 

Nandy

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Apr 10, 2004
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Re: Just Bought 1973 Cobalt Need Help!!!!!

So for instance cause I am a new boater If I had to replace the floors and transom and all that whats that looking like? I would like to do it myself...So on the cobalt the transom is a piece of wood?

If you can do it yourself or not is hard for us to tell. Look around in the restoration forum then you tell us if you think you can handle it. BTW, you dont have floors in that boat, you have a DECK. Not being rude, just helping you name things right.

Get the navigation course from the Power Squadron or the Coast Guard before you are going out on her. Believe me, it can save your life and others plus it will give you a lot of information you dont even knew you needed. For example, your boat is an inboard, so if you try to start your boat without using the blower for about 5 minutes you can blow up... The course can also get you in contact with fellow boaters in your area that can either learn with you or help you along. If you have taken the course already then a high five to you.

I am not familiar with your specific rig, but most fiberglass boats that old are going to have wood in the transom, stringers and deck. The will also have some foam under the deck which if it is waterlogged will cause problems so you will have to remove it.

If your deck is rotting you need to inspect the stringers, transom and the foam under the deck (if any) as these 4 goes together. A quick check on the transom can be done by taping on it with a rubber or plastic hammer. A muffled thud is indicative of water and/or rot in your transom. This test is generally done before you buy the boat. Now that you own the boat you can drill a hole in the transom on the inside of the boat. I will say around half the thickness of the transom. See if the wood comes dry or wet. Do this as close to the deck and as close to your motor as possible, then to the side and close to the deck also. You can later patch the holes with 5200, marintex or glass it. No more than 4 holes total. It dont need to be a large drill bit either. a 1/4 or 3/8 inch bit will be fine.

To check the stringers (the stringers support your deck on the hull) (hull is the main body of your boat) you will have to remove your deck or at least a portion of it. If you are only removing part of your deck is good to know that rot generally starts in the stern ( the back of your boat) as most boats are stored with the bow (the forward part of your boat) up but the bow should also be checked as many careless boaters do store their boats with the bow down. If you take all of your deck out then inspect the entire length of your stringers.

To check your FOAM (fiberglass was a brain f@rt typo) to be waterlogged or not use a pipe and punch a hole on it going all the way down to the hull being careful not to damage the hull. Pull the pipe and inspect the foam. It should be dry. Check it in many other places. You can push the foam back with some sealant in place if all check ok.

As a general rule, if your floor is seriously rotted so will be your stringers and transom. Most of the time the foam being waterlogged is the culprit. If you find problem in one, check them all...

Good luck, keep us posted.
 
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Wvawitrado

Petty Officer 3rd Class
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Re: Just Bought 1973 Cobalt Need Help!!!!!

Wow thank you very much for the info I will go home tonight and try those tests there is only one soft spot on the DECK (already catching on) LOL right in front of the motor over the gas tank. Otherwise it seems pretty sound and dry although to the eye atleast I will further my research and let you guys get a couple pictures to look at...to kind of help me out I appreciate this very much THANK YOU!
 

Nandy

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Re: Just Bought 1973 Cobalt Need Help!!!!!

We love pictures!!!! Is like watching boat porn! LOL! I hope that did not went across wrong! LOL! ;)
 

Wvawitrado

Petty Officer 3rd Class
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Re: Just Bought 1973 Cobalt Need Help!!!!!

LOL HILARIOUS!!!!! Yeah I will throw some on by tonight or for sure tomm!!!
 

Wvawitrado

Petty Officer 3rd Class
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Re: Just Bought 1973 Cobalt Need Help!!!!!

<a href="http://s25.photobucket.com/albums/c59/SCordero531/?action=view&current=JORDANSBOAT005.jpg" target="_blank"><img src="http://i25.photobucket.com/albums/c59/SCordero531/JORDANSBOAT005.jpg" border="0" alt="Photobucket"></a>
<a href="http://s25.photobucket.com/albums/c59/SCordero531/?action=view&current=JORDANSBOAT008.jpg" target="_blank"><img src="http://i25.photobucket.com/albums/c59/SCordero531/JORDANSBOAT008.jpg" border="0" alt="Photobucket"></a>
MY BABY!!!!!!!
 

fishingdan

Lieutenant Junior Grade
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Feb 12, 2005
Messages
1,045
Re: Just Bought 1973 Cobalt Need Help!!!!!

For the hole in the bottom, get some epoxy and a little bit of fiberglass cloth and repair it starting from the inside. Do a search on this site and see how people are patching holes in their hulls. It is easy to do.

Below are your pics.

JORDANSBOAT005.jpg

JORDANSBOAT008.jpg
 

PowerAddict

Chief Petty Officer
Joined
Aug 8, 2007
Messages
418
Re: Just Bought 1973 Cobalt Need Help!!!!!

I want to see moreee!!!!!

But from the looks of it, those seats will clean up very nicely! Should be shining when you get em all cleaned up.

Nice rig man!
 

forgeworks

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Jul 19, 2009
Messages
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Re: Just Bought 1973 Cobalt Need Help!!!!!

Congratulations! Looks like a clean boat. I also have a 1973 Cobalt 18' tri hull. Mine is the 888 w/ Ford 302 V8. It was in the garage and in the family for 30+ years and owned by my brother-in-law who is a shop foreman in an auto shop. The engine runs SWEET! This boat has a double hull. The floor in the back port side is rotting a bit because the skiers climb up the ladder on that side and drip water on the floor there. I also need to rip the floor up and replace some of it. I doubt if your transom has any problems. Cobalt was the top of the line manufacturer of ski boats in those days and they built everything right. It should serve you well. As with any older vehicle you should start replacing engine components and cleaning wiring connections whenever you have a chance. I would start with the selenoids and starter wiring. Also replace the points with a Mallory electronic ingintion. Be sure to get a coil that has a ballast resistor. Good luck, Tim
 
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