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  1. tpenfield

    2016 Mercruiser 6.2L ECT DTS Axius Cooling System Issue

    Thanks everyone 🙏 . . . I appreciate the guidance and moral support. I am not sure what the temperature is supposed to be. I looked in the engine manual (section 7) but did not see any specification for riser temperature range. I think 190˚F ish still may be too hot, but maybe the CAT risers...
  2. tpenfield

    2016 Mercruiser 6.2L ECT DTS Axius Cooling System Issue

    Here are my recordings from this morning . . . Since I did the Port engine first yesterday, I started with the Starboard engine today. The key difference is that coming out of the harbor, the exhaust riser temp is in the 140˚F range and goes up from there. When I record the other engine, it...
  3. tpenfield

    2016 Mercruiser 6.2L ECT DTS Axius Cooling System Issue

    There is not much information about the 'strainer' (8M0095457) in the cooling system. So, as part of my checking of the cooling system, I took the cover off the strainer. . Of course, it is smack dab behind the engine mount . . . . . Pretty much a bypass device with a 'screen' for the line to...
  4. tpenfield

    2016 Mercruiser 6.2L ECT DTS Axius Cooling System Issue

    Hi Scott . . . I hope this helps. . . The ECT (glycol temp) is in the crossover casting that is in front of the engine. "Item #17" is the EMCT, but in a closed cooling configuration it is more appropriately called the "RCT" (Riser Temp). There is an internal block-off gasket (#13) that...
  5. tpenfield

    2006 5.7L Mag Overheating

    I didn't see this info in your other thread . . . Salt water or fresh water? Raw water cooled? or Closed cooling? Last time the manifolds and risers were inspected? It might be fairly quick to take the water inlet fitting off the transom assembly for a 'bravoitis' check. (The inlet at the...
  6. tpenfield

    2016 Mercruiser 6.2L ECT DTS Axius Cooling System Issue

    I could temperature probe it fairly easily . . . not sure about measuring the flow. In other news . . . I drained, neutralized, and purged the oxalic acid that had been sitting in the risers overnight. Then I buttoned everything up and took the boat out for a test run with Diacom recordings...
  7. tpenfield

    90hp outboard died suddenly, wouldn't restart

    Maybe it 'works' and killed the engine. You could exercise the switch to see if it makes a difference.
  8. tpenfield

    2016 Mercruiser 6.2L ECT DTS Axius Cooling System Issue

    @Scott Danforth and others . . . Here are the flow diagrams for both the raw water and the glycol sides of the cooling system. . Raw Water Side . Raw Water Reference Chart . Glycol Side . I'm headed out to the boat soon to finish up my work from the past couple of days. Hopefully will come...
  9. tpenfield

    2016 Mercruiser 6.2L ECT DTS Axius Cooling System Issue

    Well, I’m also thinking the manual is the more correct version, as the only way for raw water to exit the system is via the risers. The manual more clearly shows that.
  10. tpenfield

    2016 Mercruiser 6.2L ECT DTS Axius Cooling System Issue

    This diagram from the parts list shows slightly different routing to the poppet valve (I believe). .
  11. tpenfield

    2016 Mercruiser 6.2L ECT DTS Axius Cooling System Issue

    I am up early this AM. I think this is the page you are referring to . . . . .
  12. tpenfield

    2016 Mercruiser 6.2L ECT DTS Axius Cooling System Issue

    BTW - for those who have not used oxalic acid, here is what 'AI' says about it. . . "Soaking an iron casting in an oxalic acid solution is a common method for removing rust. Oxalic acid effectively removes rust (iron oxide) by converting it into water-soluble iron oxalate, which can then be...
  13. tpenfield

    2016 Mercruiser 6.2L ECT DTS Axius Cooling System Issue

    BTW - The more I think about the exhaust pieces, it looks like the best thing is to unbolt the riser from the exhaust manifold, swing it up 90-180˚ and pull it out of the rubber coupler (boot). Then the other pieces should come apart as needed.
  14. tpenfield

    2016 Mercruiser 6.2L ECT DTS Axius Cooling System Issue

    I filled the risers with a fairly strong mixture of oxalic acid (via a long hose to the lower fitting) and will let it sit overnight. I have an appointment in the AM, so I'll be out on the boat in the PM running some neutralizer and seeing how things look.
  15. tpenfield

    2016 Mercruiser 6.2L ECT DTS Axius Cooling System Issue

    Not much luck getting the exhaust pieces separated. The boots are plenty loose, the pieces just don't want to go. I'm done fiddling with them, I'm on to an acid soak of the internals, to the greatest extent that I can. I'm using oxalic acid (aka wood bleach). I've had good luck before...
  16. tpenfield

    2016 Mercruiser 6.2L ECT DTS Axius Cooling System Issue

    I'm trying to get the boots off the exhaust risers and elbows so I can get a look at the riser internals. . . They are no easier than the old style to get apart. So far, I have taken off the clamps and briefly ran the engines to loosen the boots up (which they did). Still hard to get things...
  17. tpenfield

    2016 Mercruiser 6.2L ECT DTS Axius Cooling System Issue

    @Scott Danforth . . . 5th strainer . . . Before all the other strainers . . . . :LOL:
  18. tpenfield

    2016 Mercruiser 6.2L ECT DTS Axius Cooling System Issue

    Yes, the highest that I have seen is 80˚F for water temp and it only lasts for a couple of weeks. I'm also thinking flow issue, so I'll see what I can do short-term, as I only have a couple of days to work on it. I think I need to run the Diacom recording for longer - yesterday it was only...
  19. tpenfield

    2016 Mercruiser 6.2L ECT DTS Axius Cooling System Issue

    Hi @Lou C - The exhaust is steel, both manifold and risers. AFAIK - The exhaust has never been inspected or replaced. The boat is in its 10th season, so not a surprise that it needs some love. ;) Out in the bay, I was getting a water temp of 78˚F . . . in the harbor it was a little less. We...
  20. tpenfield

    2016 Mercruiser 6.2L ECT DTS Axius Cooling System Issue

    Hi @Lou C - The exhaust is steel, both manifold and risers. AFAIK - The exhaust has never been inspected or replaced. The boat is in its 10th season, so not a surprise that it needs some love. ;) Out in the bay, I was getting a water temp of 78˚F . . . in the harbor it was a little less. We...
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