Official 1980's Weekender/Sundancer 300 thread

Discussion in 'Classic Sea Rays' started by Lucky's, May 28, 2012.

  1. Steve Moore

    Steve Moore New Member

    12
    May 7, 2018
    1987 Sundancer 300
    2X Mercruiser V8s with alpha drives
    1987 Sundancer 300 with twin Mercruiser 5.7 I/O.

    Somehow the previous owner ended up with two different temperature sensors/thermostats on the engines, so according to the gauges one engine runs at about 120F and the other about 170F. Can someone point me to the best place to get the correct thermostats so my engines aren't running above/below temp.

    As an aside, I was told it was better to run engines at lower temps in salt water to prevent buildup of deposits, is that true?

    Steve
     
    Last edited: Sep 1, 2019
    Iskender Kutlucinar likes this.
  2. TitanTn

    TitanTn Active Member

    351
    Jul 12, 2015
    Chattanooga, TN
    1986 Saltare, 1998 400 Express
    454 direct drive; twin 3116TA
    You can get thermostats from many different places online or likely locally too.

    I recommend running the thermostat that the engine is designed for. Salt deposits won’t matter if you get premature bearing wear due to the motor not completely warming up.
     
  3. dwna1a

    dwna1a Well-Known Member GOLD Sponsor

    Apr 23, 2012
    James River
    88 Weekender 300 "Seahorse"
    Twins 350
    Taylormarine.com 3507040 flocking it is expensive
     
  4. David Hayward

    David Hayward New Member

    9
    Aug 7, 2019
    1987 Weekender 300
    Twin 350 meecruiser
    Is it more likely that there is a bad ground or the starboard side gauges have bad bulbs lol.
     

    Attached Files:

  5. David Hayward

    David Hayward New Member

    9
    Aug 7, 2019
    1987 Weekender 300
    Twin 350 meecruiser

    I know this is a bit old but what brand chalk paint and where did people buy this? I want to just try changing some ugly pink colored things to gray in my cabin instead of new upholstery.
     
  6. Steve Moore

    Steve Moore New Member

    12
    May 7, 2018
    1987 Sundancer 300
    2X Mercruiser V8s with alpha drives
    The only gauge on my entire dash that still works is the engine rpm/tach synch gauge. How do I even start to trouble shoot these gauges and begin to get them working again? Any suggestions would be helpful.
     
  7. JVM225

    JVM225 Well-Known Member GOLD Sponsor

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    If all the gauges are out I’m thinking there has got to be a common problem. I wonder if a common ground could be your problem.
     
  8. Steve Moore

    Steve Moore New Member

    12
    May 7, 2018
    1987 Sundancer 300
    2X Mercruiser V8s with alpha drives
    "If all the gauges are out I’m thinking there has got to be a common problem. I wonder if a common ground could be your problem."

    I will check for a common ground, that said most of the gauges have activity/movement, they are just wildly inaccurate and unreliable. Do gauges just go out of spec after years of use, do they need calibrated or do their sensors need replaced?
     
  9. Roy Antonutti

    Roy Antonutti New Member

    9
    Oct 17, 2019
    GEORGIAN BAY
    1989 300 Weekender
    5.7 Bluewater series, Tunnel drives
    Hi guys, can any one tell me where I might find a few boat wreckers. Im look for a wide back to back seat for my 30 weekender 1989. I heard they were used in various models.Both my front seats are only forward facing.
     
  10. Roy Antonutti

    Roy Antonutti New Member

    9
    Oct 17, 2019
    GEORGIAN BAY
    1989 300 Weekender
    5.7 Bluewater series, Tunnel drives
    Hi David, Im Roy. I have an 89 WE with a pair of 5.7s . I would like to ask you a question. You pass seat is a back to back. Does it lay down into a bed? Is the seat hinged on a track to the side wall?
     
  11. Drifter22ft

    Drifter22ft Active Member

    107
    Mar 23, 2018
    Lake powell
    1988 sundancer 300
    Dual 5.7 l
    Hi everyone just upgraded from a 74 220 to a 1988 300 sundancer so will be here looking for help and maybe helping others
     
  12. Captainscall

    Captainscall Member

    53
    Sep 4, 2018
    1988 300 Sundancer
    350 Mercruisers w/Alpha Drives
    Needing some help. I lost both alternators on my 88 300 Sundancer a few weeks ago. I was hoping to replace them next weekend and went to order them but there seems to be numerous options out there. Can anyone confirm what alternators they have? I have twin Merc 350 with alpha drives. The list I saw has several manufacturers listed with numerous wiring options. Thanks!!
     
  13. David Hayward

    David Hayward New Member

    9
    Aug 7, 2019
    1987 Weekender 300
    Twin 350 meecruiser
    Hey sorry for missing this. It hooks to the floor and does fold down and lay flat as a bed
     
  14. Drifter22ft

    Drifter22ft Active Member

    107
    Mar 23, 2018
    Lake powell
    1988 sundancer 300
    Dual 5.7 l
    Does anyone know where to get hatch hardware
     
  15. dwna1a

    dwna1a Well-Known Member GOLD Sponsor

    Apr 23, 2012
    James River
    88 Weekender 300 "Seahorse"
    Twins 350
    Taylor Made Systems
     
  16. Drifter22ft

    Drifter22ft Active Member

    107
    Mar 23, 2018
    Lake powell
    1988 sundancer 300
    Dual 5.7 l
    Ok thanks
     
  17. Drifter22ft

    Drifter22ft Active Member

    107
    Mar 23, 2018
    Lake powell
    1988 sundancer 300
    Dual 5.7 l
    My new girl
     

    Attached Files:

    SCORPIO likes this.
  18. Iprof

    Iprof Well-Known Member TECHNICAL Contributor

    Aug 8, 2008
    Lake Huron
    A 300 DA 4kw Gen-set, central vac, electric head, windlass, AC/reverse heat, Lowrance 522ci GPS Char
    twin 5.7 with Alpha drives
    Not been on here for awhile but good timing. I bought the Home Depot house brand. It has held up incredibly well. Make sure you get a chalk paint brush they sell them by the chalk paint away from the other brushes
     
  19. Iprof

    Iprof Well-Known Member TECHNICAL Contributor

    Aug 8, 2008
    Lake Huron
    A 300 DA 4kw Gen-set, central vac, electric head, windlass, AC/reverse heat, Lowrance 522ci GPS Char
    twin 5.7 with Alpha drives
    I know this is a few month old but; your engines came with 145 thermostats in it because Merc had no idea if the engine was going in a fresh water boat or a salt water boat. Boating on a Lake that never gets above 80 and spending most of my summers in the North Channel in 65 water at hull speed the temp gauges don't usually move above 125. I changed out my thermostats for 165 and the engines liked the warmer temps a lot better. They still only reach about 140 at hull speed but at 3200 they reach 165 in a few minutes.
     
    Iskender Kutlucinar likes this.
  20. Iskender Kutlucinar

    Iskender Kutlucinar New Member

    6
    Oct 21, 2019
    1985 SeaRay Weekender 300
    Twin Crusaders 350 Cu/In, 270 HP each.
    Just make sure LED's have cooling, (Heat sinks) some of the strong LED's can burn the bulb holder and maybe the boat too!
    Regards,
    Isken.
     

Share This Page

Show Sidebar