Does anyone know what typical raw water system pressure to expect at idle and max cruising RPM?
The repair was prompted because a coolant pipe was popping out of the heat exchanger and leaking. It is sealed with o-rings but it is not held securely enough (in my opinion) to suggest that it is intended to resist more than a few PSI of water pressure. I measured an alarming 10 PSI at idle and a little more than 40 PSI at 2000 RPM. After soaking the internals of the raw water system with vinegar (overnight) and removing a few zinc bits the pressure at went from nearly 40 PSI at 2000 RPM to less than 20 PSI. The pressure at idle on both motors is now less than 7 PSI.
The leaking problem appears fixed but since the system appears to be designed for low pressure, I am wondering what is normal.
Motors are twin 135 hp Volvo TAMD40B.
The repair was prompted because a coolant pipe was popping out of the heat exchanger and leaking. It is sealed with o-rings but it is not held securely enough (in my opinion) to suggest that it is intended to resist more than a few PSI of water pressure. I measured an alarming 10 PSI at idle and a little more than 40 PSI at 2000 RPM. After soaking the internals of the raw water system with vinegar (overnight) and removing a few zinc bits the pressure at went from nearly 40 PSI at 2000 RPM to less than 20 PSI. The pressure at idle on both motors is now less than 7 PSI.
The leaking problem appears fixed but since the system appears to be designed for low pressure, I am wondering what is normal.
Motors are twin 135 hp Volvo TAMD40B.