Hello!
I have a '71 Ericson 29 with the original Atomic Four. I've been having issues with seawater back flowing in to the exhaust manifold. This has occurred both under sail and at the dock. The exhaust outlet in the transom is roughly at the water line on a starboard tack and 3-4" above the water line at the dock or motoring in flat water.
The flow of raw water through the exhaust system is a bit of a puzzler. Water leaving the heat exchanger goes to a tee. From the tee, one leg goes to a vented loop and then dumps in to the exhaust elbow at the aft of the exhaust manifold. The other leg goes toward the transom and tees back in to the wet exhaust after passing through a gate valve. This entry point is just before the transom, aft of a loop in the wet exhaust. So to summarize my hot raw water has two points of entry in to the wet exhaust, one at the manifold and one just before the outlet at the transom. As part of my diagnostics to determine how raw water is back flowing in to the exhaust manifold, I'd like to understand why the system was set up this way. I will be replacing the Vetus anti siphon valve and did locate some suspect exhaust hosing and will be replacing the whole run.
Any insight?
Thanks!
I have a '71 Ericson 29 with the original Atomic Four. I've been having issues with seawater back flowing in to the exhaust manifold. This has occurred both under sail and at the dock. The exhaust outlet in the transom is roughly at the water line on a starboard tack and 3-4" above the water line at the dock or motoring in flat water.
The flow of raw water through the exhaust system is a bit of a puzzler. Water leaving the heat exchanger goes to a tee. From the tee, one leg goes to a vented loop and then dumps in to the exhaust elbow at the aft of the exhaust manifold. The other leg goes toward the transom and tees back in to the wet exhaust after passing through a gate valve. This entry point is just before the transom, aft of a loop in the wet exhaust. So to summarize my hot raw water has two points of entry in to the wet exhaust, one at the manifold and one just before the outlet at the transom. As part of my diagnostics to determine how raw water is back flowing in to the exhaust manifold, I'd like to understand why the system was set up this way. I will be replacing the Vetus anti siphon valve and did locate some suspect exhaust hosing and will be replacing the whole run.
Any insight?
Thanks!
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