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 SILVER Sponsor

    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
  2. TitanTn

    TitanTn Active Member

    331
    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

    8
    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.
     

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  5. David Hayward

    David Hayward New Member

    8
    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 SILVER Sponsor

    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 SILVER Sponsor

    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?
     

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