First post and I searched a lot here and on THT, so thanks in advance.
Have a Bertram 28 with twin Mercruiser 5.7's, FWC, carberated. Lives in salt water. Just replaced both exhaust manifolds(Stainless Marine) on the starboard engine and all cooling hoses(no overheating issues, it was just time). Running 160F thermostats both engines and they both run at exactly 170F, but starboard side gets to temp much faster. Also just had the heat exachangers on both engines serviced.
My issues are with the starboard engine only; coolant recovery tank fills up very quickly, never overflows or bubbles, but goes from almost empty to full very fast, unlike the port engine. Also right exhaust manifold is very hot to the touch and port manifold is only warm. Lastly, there's a knocking or clacking sound once the engine gets to temperature which seems to be associated with a pulsing in the cooling hose from the exhaust manifold to the heat exchanger. Cooling hoses from the tstat to the exhaust manifold never seem to be pressurized either.
Could there still be air trapped in the system(I bled it)? Bad thermostat?
Again, no overheating issues, I'm just wondering why the heat difference in the exhaust manifolds and the recovery tank filling so quickly. All after replacing the exhaust and heat exchangers. I'm stumped and it's driving me crazy.
Thanks much for any insight.
Have a Bertram 28 with twin Mercruiser 5.7's, FWC, carberated. Lives in salt water. Just replaced both exhaust manifolds(Stainless Marine) on the starboard engine and all cooling hoses(no overheating issues, it was just time). Running 160F thermostats both engines and they both run at exactly 170F, but starboard side gets to temp much faster. Also just had the heat exachangers on both engines serviced.
My issues are with the starboard engine only; coolant recovery tank fills up very quickly, never overflows or bubbles, but goes from almost empty to full very fast, unlike the port engine. Also right exhaust manifold is very hot to the touch and port manifold is only warm. Lastly, there's a knocking or clacking sound once the engine gets to temperature which seems to be associated with a pulsing in the cooling hose from the exhaust manifold to the heat exchanger. Cooling hoses from the tstat to the exhaust manifold never seem to be pressurized either.
Could there still be air trapped in the system(I bled it)? Bad thermostat?
Again, no overheating issues, I'm just wondering why the heat difference in the exhaust manifolds and the recovery tank filling so quickly. All after replacing the exhaust and heat exchangers. I'm stumped and it's driving me crazy.
Thanks much for any insight.
