Official 390 E.C. Thread

Discussion in 'Classic Sea Rays' started by electricaldoctor, May 19, 2009.

  1. Sublimetime

    Sublimetime Active Member

    490
    Oct 22, 2007
    clifton nj
    420 da
    454
    A tanks top should not expand unless you are totally over filling. The sides yes, the top no.
     
  2. Fireball1

    Fireball1 Member

    39
    Dec 10, 2017
    Sandusky, Ohio
    390 Express Cruiser, 1989
    Twin 454 Merc
    Ricochet,, do you have the specs for your new tank? Did you have them put the fill, vent, etc in the same location as the stock tank? I need to get one ordered..
     
    Last edited: Dec 18, 2017
  3. electricaldoctor

    electricaldoctor Well-Known Member TECHNICAL Contributor PLATINUM Sponsor

    May 14, 2008
    Thousand Islands, Rockport, Ontario.
    1988 390 EC
    454 Mercruiser Gassers
    My original tank was not made of steel. It was aluminum. When I pulled it several years ago, I found a few pin hole leaks, so I had the tank dipped in an acid solution prior to welding up the leaks. I then had the tank double coated with "Linex". This is the material that they spray pickup truck bed liners with. Prior to reinstalling the tank, I installed strips of starboard spaced every 10" to keep the tank off the bottom. End of problem!!
     
  4. Ricochet

    Ricochet Member

    107
    Mar 10, 2009
    West Michigan
    1990 390 Express
    454 Mercrusier
    Fireball1
    When I removed the tank I did not want to remove the settee and the wall around the refrigerator so I only cut out part of the floor, I had to cut the tank in half to remove it, the largest tank I could get back in could only be 55'' long....so I settled on a new tank 11''x27''x55'', Dura Weld was able to put the fittings where I wanted them based on a drawing I gave them basically where they were originally.
    IMG_1219.JPG IMG_1238.JPG
     
  5. Ricochet

    Ricochet Member

    107
    Mar 10, 2009
    West Michigan
    1990 390 Express
    454 Mercrusier
    .
    Fireball1
    I found the drawing I sent them, the only difference is the pick-up they provide is 3/4'' not 1/2'' as shown in the drawing.

    Dura Weld contact info:
    Gareth
    Dura Weld
    3599 23rd Ave S, #9
    Lake Worth, FL 33461
    561-586-0180 Office
    561-586-0181 Fax
    www.dura-weld.com
    www.plasticfabricatedtanks.com
     

    Attached Files:

  6. Sublimetime

    Sublimetime Active Member

    490
    Oct 22, 2007
    clifton nj
    420 da
    454
    You should use a layer of that rubber deck floor squares, that you have there in the storage hatch, under the new water tank. It allows air and any water that might get in there (the tanks tend to sweat a bit when filled with cold water in a warm humid bilge, and collect water under them)to circulate all around tank. And they are plenty strong enough to support the weight of the filled tank.
     
    Fireball1 likes this.
  7. Fireball1

    Fireball1 Member

    39
    Dec 10, 2017
    Sandusky, Ohio
    390 Express Cruiser, 1989
    Twin 454 Merc

    Awesome!! Thanks so much Ricochet! I had some time today so I ran up to the boat. I pulled the refrigerator and steps out. I was able to verify that the tank was for sure the original. I also was able to look beside the tank in a small space behind the refrigerator. I could see about 1/2 deep frozen tea water. It was in the same location where the water lines go through the bulkhead. Well,,, the fun begins.. LOL...
     
  8. Fireball1

    Fireball1 Member

    39
    Dec 10, 2017
    Sandusky, Ohio
    390 Express Cruiser, 1989
    Twin 454 Merc
    Question? Why is there not a bilge pump in the location of the freshwater tank? Would make sense to me to have one in that location given it is a catch all from the rest of the potential overflows. Any thoughts on putting one in that area?
     
    Last edited: Dec 20, 2017
  9. Ricochet

    Ricochet Member

    107
    Mar 10, 2009
    West Michigan
    1990 390 Express
    454 Mercrusier
    Fireball
    After you remove the tank you might want to cut an access hole in the subfloor below the tank, if you have not done this already you will most likely find some water. Use a 4 1/2'' hole saw which will allow you to install a 4'' West Marine access plate, you will have to cut out the foam to cut to the bottom of the hull. you can see in the photo the hole I cut.
     

    Attached Files:

  10. Fireball1

    Fireball1 Member

    39
    Dec 10, 2017
    Sandusky, Ohio
    390 Express Cruiser, 1989
    Twin 454 Merc

    How many inches between the sub-floor under the tank and the surface of the hull? Also, what is the box above the airrr box in your picture? Did you put bilge pump in the hole? How can you access in the tank is in place for later viewing without taking everything apart? Oh,, and what Teak floor did you go with? Looks great,, Thanks for the help and ideas.
     
  11. Ricochet

    Ricochet Member

    107
    Mar 10, 2009
    West Michigan
    1990 390 Express
    454 Mercrusier
    There is about 6-8'' between the sub-floor and the hull it is filled with foam, the new tank will be installed about 6'' from the wall so I can access a water tight access plate and remove any water with a shop-vac, I have had one installed in front of the tank for about ten years, when I first installed it there was water and every once in awhile I still find a small amount. You will want to keep the covers on them in case your shower sump or a water line ever fails. I have also installed one in front and back of the generator in the bilge, some water at first and once in awhile now. You can cut out the foam with a hack saw blade. The box you see is my battery charger, when I replaced it I installed it there for ease of installation. The vinyl floor is Plasteak its been in about 8 or 9 years its been great, however, I just removed it and will be installing the new E-Z boat sole plank flooring that Plasteak makes in the entire cabin. I decided to do that after I cut the floor out for the tank, I would have cut the floor a little different as I was trying to save the vinyl at that point.
     
  12. Fireball1

    Fireball1 Member

    39
    Dec 10, 2017
    Sandusky, Ohio
    390 Express Cruiser, 1989
    Twin 454 Merc
     
  13. Ricochet

    Ricochet Member

    107
    Mar 10, 2009
    West Michigan
    1990 390 Express
    454 Mercrusier
    Fireball1
    Here are photos of access holes in bilge. Foam was just for sound no need to replace.
     

    Attached Files:

  14. Fireball1

    Fireball1 Member

    39
    Dec 10, 2017
    Sandusky, Ohio
    390 Express Cruiser, 1989
    Twin 454 Merc
    Spotless!! Looks great!! Thanks for the pictures. Definitely helps to know where to drill. I did order access caps for the locations today. I went with clear screw lids, quick viewing. I will get the old tank out next week and get the new one ordered in the mean time. I'd head up this weekend but, my wife thinks I should be around for Christmas, LOL.
     
  15. Fireball1

    Fireball1 Member

    39
    Dec 10, 2017
    Sandusky, Ohio
    390 Express Cruiser, 1989
    Twin 454 Merc
    1C5E4650-0BB4-4D13-B8DF-11B15EDBBEB6.jpeg 1C5E4650-0BB4-4D13-B8DF-11B15EDBBEB6.jpeg 6468ECF2-DE39-4319-B91D-CA15D827DD12.jpeg 2FA38154-8B87-483D-9502-25A3B24BEB84.jpeg 4B80C970-6213-4978-9A05-01508030C449.jpeg Ricochet....Well first hole has been drilled.. I am so glad I had time to do this before it gets ice cold outside again.
     
  16. Fireball1

    Fireball1 Member

    39
    Dec 10, 2017
    Sandusky, Ohio
    390 Express Cruiser, 1989
    Twin 454 Merc
    CD1E4B07-78C7-41AF-899A-294C85643366.jpeg 38EEEB6D-99F4-43A1-BC40-A2A96BEC30EB.jpeg AE5678F4-E608-47C2-AF30-4207C562DE3C.jpeg Same in the Stern bilge..
     
  17. hottoddie

    hottoddie Well-Known Member

    Jan 11, 2012
    Boston/Cape Cod
    1986 Sea Ray 390 Express
    Garmin 4212 Chartplotter
    Garmin 24 HD Radar
    Garmin GSD 22 Sounder
    Garm
    454 Crusaders
    Fireball looks good but double up on those raw water hose clamps.
     
    Fireball1 likes this.
  18. Ricochet

    Ricochet Member

    107
    Mar 10, 2009
    West Michigan
    1990 390 Express
    454 Mercrusier
    Fireball1
    I agree with hottoddie about the clamps, cannot tell from the photos if you had any water under the floor?, depending on the attitude of how the boat is set you may see some water after you launch in the spring.
     
  19. Fireball1

    Fireball1 Member

    39
    Dec 10, 2017
    Sandusky, Ohio
    390 Express Cruiser, 1989
    Twin 454 Merc
    Between both holes I was able to suck out around 3 to 4 gallons of water. I still need to get the tank out. I will then put an access at the bulkhead under the tank. I am sure there is still water under the floor, maybe a couple more gallons. I looked in the tank and it is holding the antifreeze that I put into it before I wrapped the boat. So I'm not sure if the tank is leaking. I also still need to put an access in front of the generator. Not sure how I am going to get the tank out without taking the panel out next to the fridge? Note: I will double up the clamps, noted. Thanks
     
  20. Ricochet

    Ricochet Member

    107
    Mar 10, 2009
    West Michigan
    1990 390 Express
    454 Mercrusier
    I cut the tank in half with a sawsall and grinder and pulled it out in two pieces
     

Share This Page

Show Sidebar