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Found 2 results

  1. My 2015 ZR409 exhaust manifolds are overheating then my boat goes into some kind of limp mode. My ZR409 has coolant in the engine block and fresh water in the manifolds with a heat exchanger in the rear. No engine light is coming on and the water temp is reading normal. What I think is happening is the exhaust manifolds are getting clogged up? When I pull the plugs on the manifolds I get a lot of debris coming out with the water that looks like silt or hard water that has been baked onto the inside of the manifold then has flaked off. This is the second time this has happened, the first time was only about 20 hours prior. Do you think I'm correct in assuming that the overheating is due to the manifolds getting clogged? If so is there anything I can do beside pulling the four plugs and removing the debris? Could my issue be something completely different and if so what can I check?
  2. Got a few over temp alarms at the end of last season. Changed the impeller before putting in this spring. No alarms so far but can feel a quite temp difference between the 2 exhaust manifolds. Have always run a strainer on the water intake. Any suggestions on cause or troubleshooting? Thanks!
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