Mercruiser 5.7 MPI Bravo
Serial# 0w377395
Overheating issue. Replaced seawater impeller (was in pieces), replaced thermostat, and back flushed the cooling system (can't find any blockages)....still overheating. With my temp gun I can see that the engine (block, heads, manifolds) are running considerably cooler than the thermostat housing. Even with the thermostat out, the engine will slowly overheat but the hottest point is always at the therm housing. I have flush both risers so I'm stuck with blown head gasket. Agreed?
There is no water in the oil so is there any other way to verify this before the top end rebuild? Is there a way to determine which head is the issue? I thought of running some clear tubing from the t-stat to the risers to look for air bubbles, but I doubt it's accuracy. Thanks as always.
Serial# 0w377395
Overheating issue. Replaced seawater impeller (was in pieces), replaced thermostat, and back flushed the cooling system (can't find any blockages)....still overheating. With my temp gun I can see that the engine (block, heads, manifolds) are running considerably cooler than the thermostat housing. Even with the thermostat out, the engine will slowly overheat but the hottest point is always at the therm housing. I have flush both risers so I'm stuck with blown head gasket. Agreed?
There is no water in the oil so is there any other way to verify this before the top end rebuild? Is there a way to determine which head is the issue? I thought of running some clear tubing from the t-stat to the risers to look for air bubbles, but I doubt it's accuracy. Thanks as always.