I have a fairly bizarre loop setup on my exhaust
, and am currently having trouble with it. Any help on understanding it from you fine folks would be appreciated.
There is a custom made u-shaped loop on the exhaust
side of my engine's cooling water
. It has 3 lines (formerly 4) going into it, and lacks an anti-siphon valve or air hole entirely.
- Going into the center of the arch of the U is the 1" coolant
line coming out of the raw water
- The left side of the U is a 3/4" line leading to the exhaust elbow water
- The right side is a 1" line leading to the top of the gooseneck at the stern
-There used to be a 3/4" line welded into the left (exhaust elbow
line) that led to a port on the intake of the waterlock muffler
. I replaced the muffler
, and saw no need to add this extra plumbing
back in to the new one
The loop is led to about 10" above the waterline on the centerline of the boat. The engine
is totally below the waterline.
Due to an older impeller, water can freeflow through the raw water
intake, past the impeller, into this high loop, and then to the exhaust elbow, where it fills the muffler and eventually the elbow, cylinders, and then flows out of the air intake. Replacing the impeller seems to be a short term fix. Currently, we turn the raw water intake off and on for engine
operation, but this also could lead to disaster if forgotten.
Any idea what was going on in the designer's mind? If I replace with an anti siphon loop from the engine to the exhaust elbow, thus removing the 1" line to the gooseneck, will I cause new problems?
Help! We just rebuilt this engine and already hydrolocked it once. No damage, but this setup makes me nervous.