I just finished with the manifold and block pressure tests, both held 20psi for about an hour.
The reason for the sketch’s
I was thinking maybe the exhaust hose from the muffler to the transom is too high above the riser causing what water is left in the the hose to flow backwards towards the riser once the engine is turned off.
The y valve idea was a theory to save the water pump from running dry for the last 15 or 20 seconds of the engine run to blow any remaining water out of the exhaust hose. But Neil is right and I didn’t think of it but that could harm the muffler running it dry.
I checked the water injection port and it is about a 4 inch nipple that looks to reach just below the 90.
I ran the engine for a combined few hours yesterday while I did more oil changes and again today for about an hour. Everything seems to be working fine but I was shutting off the seawater intake before shutting the engine down.
The reason for the sketch’s
I was thinking maybe the exhaust hose from the muffler to the transom is too high above the riser causing what water is left in the the hose to flow backwards towards the riser once the engine is turned off.
The y valve idea was a theory to save the water pump from running dry for the last 15 or 20 seconds of the engine run to blow any remaining water out of the exhaust hose. But Neil is right and I didn’t think of it but that could harm the muffler running it dry.
I checked the water injection port and it is about a 4 inch nipple that looks to reach just below the 90.
I ran the engine for a combined few hours yesterday while I did more oil changes and again today for about an hour. Everything seems to be working fine but I was shutting off the seawater intake before shutting the engine down.
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