Recent content by bigblock454

  1. bigblock454

    Closed loop cooling, sediment around thermostat…

    Me again. So, I guess I should be replacing thermostats with 160°? Norm
  2. bigblock454

    Closed loop cooling, sediment around thermostat…

    Wow! Certainly appreciate your replies and help. I’m certainly no expert, and that’s why I am posting here. From what research I have done, to find replacement parts, it seems that “that” particular thermostat riser and housing is only available on closed loop design.. Rall water thermostat...
  3. bigblock454

    Closed loop cooling, sediment around thermostat…

    In the process of doing lots on the boat. Was hoping to share and get some answers here. Perhaps if I put this, and the rest of my inquiries as well as progress on the “resto“ page? Norm
  4. bigblock454

    Closed loop cooling, sediment around thermostat…

    Guess not much traffic on these website forums anymore. Seems everything has migrated, or is migrating to FB. Guess I need to break down, and make an account. Ugh Norm
  5. bigblock454

    Closed loop cooling, sediment around thermostat…

    Ok… on break again. So…. My theory (and I could be way wrong): if you look at the riser, that the thermostat sits on, it has a bypass cut into it, that to me looks rather large. To support this “theory”, I see now that they offer gaskets reducing the size of that bypass to a hole that seems to...
  6. bigblock454

    Closed loop cooling, sediment around thermostat…

    Also attached picture above of thermostat, showing another view, how sediment accumulation was confined to underneath the thermostat, in the riser area. I have a theory, but I am not an expert on the situation. Have to go back to work, for the second half of my day. I will check back later, and...
  7. bigblock454

    Closed loop cooling, sediment around thermostat…

    Few more pics. Hope they come through in order, as I am doing this from my cell phone. First one shows the brass rings inside each thermostat riser/housing. Looks like someone either tried to remove them, or install them with a chisel! Mind you this was all closed up and running like this. Don’t...
  8. bigblock454

    Closed loop cooling, sediment around thermostat…

    Barnacle buster sounds like a good idea to run through it, when it is buttoned back up. Again, everything else seems to look pretty clear of sediment and debris. Just that area underneath the thermostats. Puzzled.
  9. bigblock454

    Closed loop cooling, sediment around thermostat…

    Thank you for your quick reply. It is the build up, seen in the picture. Kind of gooey, when wet, but quickly turns to dust as it dries. As far as I know, this boat has always been close loop. Thanks again.
  10. bigblock454

    Closed loop cooling, sediment around thermostat…

    Me again… just to add… The hoses are in great shape, and has good looking antifreeze in it, currently. Just puzzled by the blockage under the thermostats, particularly the bypass area. There is a brass ring in the thermostat risers, that I am going to attempt to replace. Those brass rings look...
  11. bigblock454

    Closed loop cooling, sediment around thermostat…

    Again, heat exchanger and their tubes are pretty clean. The thermostats are rated at 140°. In the process of cleaning the heat exchangers, replacing and gaskets and anodes. Thanks for any help and/or advice, regarding that yellow/green sediment.
  12. bigblock454

    Closed loop cooling, sediment around thermostat…

    Good evening all. Purchased a 1986 Wellcraft 2900 Sportbridge, with dual mercruiser 350cid inboards. Each has a heat exchanger mounted on it. Rebuilding the heat exchangers now, and they look fine. But I am a bit alarmed at this yellow/green sediment under the thermostat, darn near clogging that...
  13. bigblock454

    Popped Freeze (core) plug...

    Ok folks... I said I would update... Here ya go... Bets placed?? Did I mention that there's NO room to work around there?? After lots of scraped knuckles...
  14. bigblock454

    Popped Freeze (core) plug...

    Bad day... well SOME of it good. Got my rebuilt outdrive back on, with new bellows, shift cable, gimbal bearing, etc.... all works great... EXCEPT!!!! Fired my "new" boat up for the first time "on the muffs", and... water coming out of bilge drain... FAST!! Quickly shut it down and determined...
  15. bigblock454

    New Project... SleekCraft Aristocrat... Some questions...

    Here's a pic of NOT MY BOAT, but the same model, showing what I expect to see under the floor when I remove it. Actually this pic obviously taken after the rotten wood replaced.
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