Took the son and his buddy tubing a few days ago behind our Volvo v-6 deck boat (sorry not too fancy or fast).
Impeller gave up and temp pinned gage REAL quick.
Headed home asap, maybe 1/4 mile on water and a minute and 1/2...but it got hot. Smoke came off all the rubber coupler/connections on each side of the exhaust and those got toasted.
Yesterday I replaced the impeller and thought I was set until seeing how bad the exhaust rubber pieces melted. Pulled those and pick up new ones today. 4 hose pieces and 2 sets of "flappers" that go in the "Y" pipe. With open risers I wanted to ensure that my freshly installed impeller was pumping. Plenty of water, plenty of flow, but filling the cylinders also. Now I am REALLY hoping that the manifold to riser gasket just got cooked and are leaking. It takes all of about 20 seconds to lock the motor up tight. Center cylinders on both sides fill fastest and fullest. Each front is getting water but does not seem as bad.
Going to tear the risers off shortly, maybe exhaust manifolds, but...wondering what my odds are that heads aren't cracked, head gaskets didn't fail...Do not want to waste to much time if the entire motor is toast...any experiences, ideas, help, or anything else would be greatly appreciated. THANKS!!!!