Hi, I removed the pipe and water is coming out when the engine is running, I’ve also noticed that the oil filler cap is loose, will that make a difference?
Water coming out of this hose verifies the raw water pump is working so why don’t you think the engine is cooling? I would use a handheld IR sensor and take temperature readings of the thermostat housing and exhaust manifolds/risers. Other than making a oily film on the engine a loose cap shouldn’t cause any issues.
When the boat is at sea, the temperature rises very quickly under pressure and a lot of smoke is coming out, it then cuts out and will sometimes start and other times it won’t.
This happens within probably 15 minutes, the time it takes for us to get out of the marina into open water.
Ok get the Mercruiser manual under Documents and perform the water flow rate test on the same hose you removed before to be sure it’s pushing the right amount of water. Then remove the water hoses to each riser to check water flow. Finally remove the exhaust risers to inspect the water passages for blockage.
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