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  1. Lord Tywin

    Taking my lake toon to the beach

    I just bought a Coach 243 FLC tritoon and man what a great boat! What it means is that I now have a spare pontoon boat and a place in FL to leave it. It's a bay area and a small boat so I wont have it on the open water. What all considerations do I need to think of before/during it's saltwater...
  2. Lord Tywin

    Johnson 70 3cyl overheating

    What's the issue removing the tstat? It ran fine afterward. Also I made sure I did not disconnect the temp sensor tan wire. I did change the spring but the kit I bought (real Johnson OEM kit) didnt have the new tstat cover, which could be causing the restricted flow. I dont think I'm going to...
  3. Lord Tywin

    Johnson 70 3cyl overheating

    This weekend I pulled the thermostat and the issue went away. Seems it just couldnt get the water flow it needed. I will pull the head after the season and clean it up good. Meanwhile I ran it for hours and it never entered SLOW mode. Thanks for the help! On a side note, I shot video of the...
  4. Lord Tywin

    Johnson 70 3cyl overheating

    I didnt find out about this modification until a few days ago, which was a year after performing the install. It was a factory part and did not come with a new cover. All I can do right now is remove the t-stat altogether and test it again.
  5. Lord Tywin

    Johnson 70 3cyl overheating

    Just took it out and it activated SLOW while this location (inside red box) showed 180 max.
  6. Lord Tywin

    Johnson 70 3cyl overheating

    t-stat and spring yes. Dont recall there being a new cover
  7. Lord Tywin

    Johnson 70 3cyl overheating

    updated spring used with new tstat. new tell-tale location
  8. Lord Tywin

    Johnson 70 3cyl overheating

    T-stat cover wasn't bad...mildly dirty but not gunked or scaled up much especially for a motor this age. It was a year ago so I'd have to remove it again to see the condition. Since it is slowly getting worse, it seems like this may be the road I'm on. I'm willing to flush it out before trying...
  9. Lord Tywin

    Johnson 70 3cyl overheating

    yes replaced impeller, moved telltale to top, replaced thermostat and sensor.
  10. Lord Tywin

    Johnson 70 3cyl overheating

    Boat's lived its entire life on the same lake. That was my fear that it had gunk built up inside. I really didnt want to start disassembling it because of the age...breaking bolts etc seems like it will be quite a chore. Since it's slowly getting worse, I'm crossing my fingers it's the diode...
  11. Lord Tywin

    Johnson 70 3cyl overheating

    this is where it read 142...
  12. Lord Tywin

    Johnson 70 3cyl overheating

    At the top of the motor just in from the t-stat it read around 142 when SLOW kicked in. Yes it drops to high 2,000's (tach not 100%, but close). I found in my service manual how to test the diode so I'm going to do that as well as remove the t-stat completely and see what it does. I really hope...
  13. Lord Tywin

    Johnson 70 3cyl overheating

    I got a laser infrared thermometer and ran the boat this evening. When SLOW mode engaged the top of the motor where the temp sensor is, read 142. I moved over to the side opposite the exhaust manifold, where I would assume the cylinders are closer to the exterior of the motor and it read 195 at...
  14. Lord Tywin

    Johnson 70 3cyl overheating

    will be picking one of these up today and posting the results, thanks!
  15. Lord Tywin

    Johnson 70 3cyl overheating

    I moved the tell tale per the bulletin to the top of the manifold and checked the temperature. It went into SLOW mode while the discharge temp was 123 F. I dont think the thermostat even opens until 140 F. I think I'm going to try it with the thermostat removed and if it does it again I'm going...
  16. Lord Tywin

    Johnson 70 3cyl overheating

    Tell tale still in factory location but the pump kit had the parts, just not the instructions on moving the port. I will give that a try. Thanks again @oldboat1
  17. Lord Tywin

    Johnson 70 3cyl overheating

    Fantastic reply @oldboat1! Thank you for this!
  18. Lord Tywin

    Johnson 70 3cyl overheating

    My 89 J70TLCEM started overheating when run above 4,000 RPM. I replaced the impeller and it pumps very well thru the tell tale. I can run it all day at a slow cruise but when I go a little faster it overheats and goes into SLOW mode. I then replaced the temp sensor and it still does it. I'm...
  19. Lord Tywin

    89 Johnson 70 3cyl wiring question Black White Green

    I had to remove my lower unit 3 times to fix my water pump (bought a crappy 3rd party pump. ended up buying a Johnson and that fixed it. had to remove starter and disconnect some wires to get to shift linkage) and when I reinstalled everything she ran well. Til I cut her off. Then she was dead...
  20. Lord Tywin

    89 Johnson 70 3cyl wiring question Black White Green

    I had to remove my lower unit 3 times to fix my water pump (bought a crappy 3rd party pump. ended up buying a Johnson and that fixed it. had to remove starter and disconnect some wires to get to shift linkage) and when I reinstalled everything she ran well. Til I cut her off. Then she was dead...
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