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Hello,
I own a 2008 SN with an Excalibur 330 engine (GM 5.7L small block).
This summer, we were hearing a clicking noise, it was coming out of the port side exhaust. So I had to replace the exhaust manifold gaskets and the riser gaskets.
Since then, I've noticed that the port side riser is much hotter than the starboard one. I replaced the water pump impeller and also the thermostat. The problem is still there. I removed the two 3-1/2" flexible hoses at the riser outlets to push water from the two hoses coming from both side the thermostat, and the manifolds don't seem to be blocked. Then, I plugged one side of the two 3-1/2" hoses going to the muffler and pushed compressed air into the one on the other side. I noticed that there's a kind of stainless steel flap at the muffler outlet that doesn't seem to open. I then reconnected everything use a garden hose directly before the strainer and tested it with water. I noticed that water eventually came out of the muffler, but only around this stainless steel plate. How does this valve work? It seems like water is collecting in the muffler and is suddenly expelled out, is this normal? I have attached a picture of the muffler outlet where we can see the flap or exhaust valve..
Also, I tried to clamp the hose at the outlet of the thermostat housing, which goes to the starboard side, and the temperature of the port-side riser immediately dropped. There must be a restriction somewhere; could it be my muffler?
If I am not clear, let me know because english is not my primary language.
Thanks
Jeremy
I own a 2008 SN with an Excalibur 330 engine (GM 5.7L small block).
This summer, we were hearing a clicking noise, it was coming out of the port side exhaust. So I had to replace the exhaust manifold gaskets and the riser gaskets.
Since then, I've noticed that the port side riser is much hotter than the starboard one. I replaced the water pump impeller and also the thermostat. The problem is still there. I removed the two 3-1/2" flexible hoses at the riser outlets to push water from the two hoses coming from both side the thermostat, and the manifolds don't seem to be blocked. Then, I plugged one side of the two 3-1/2" hoses going to the muffler and pushed compressed air into the one on the other side. I noticed that there's a kind of stainless steel flap at the muffler outlet that doesn't seem to open. I then reconnected everything use a garden hose directly before the strainer and tested it with water. I noticed that water eventually came out of the muffler, but only around this stainless steel plate. How does this valve work? It seems like water is collecting in the muffler and is suddenly expelled out, is this normal? I have attached a picture of the muffler outlet where we can see the flap or exhaust valve..
Also, I tried to clamp the hose at the outlet of the thermostat housing, which goes to the starboard side, and the temperature of the port-side riser immediately dropped. There must be a restriction somewhere; could it be my muffler?
If I am not clear, let me know because english is not my primary language.
Thanks
Jeremy
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