"I have a 1985 Bayliner Ciera
"I have a 1985 Bayliner Ciera with an AQ125 Volvo Penta engine. It functions perfectly until you decide to cruise somewhere and then the temp slowly climbs to 200F and I drop it back to idle and it immediately cools off.
It has a new raw water pump and it squirts water straight up out of the cap at idle, so it's working fine. The engine water pump spins free and at idle you can see the water moving in the tube under the cap. The thermostat is new (and it did the same thing with the old one) All the hoses are clean, the o-rings are new, the raw water filter is clean. It has fresh water/glycol mix in the engine. The timing is set correctly, it has the correct plugs etc. It shoots plenty of water out of the exhaust port in the sterndrive. I have tried several different pitch props in case I was loading the engine..all the same problem with any of them.
I have taken the heat exchanger apart and cleaned it with Muratic acid to remove the scale, picked out the 3 or 4 small pieces of junk in the fins.
So what now...any suggestions?"
"I have a 1985 Bayliner Ciera with an AQ125 Volvo Penta engine. It functions perfectly until you decide to cruise somewhere and then the temp slowly climbs to 200F and I drop it back to idle and it immediately cools off.
It has a new raw water pump and it squirts water straight up out of the cap at idle, so it's working fine. The engine water pump spins free and at idle you can see the water moving in the tube under the cap. The thermostat is new (and it did the same thing with the old one) All the hoses are clean, the o-rings are new, the raw water filter is clean. It has fresh water/glycol mix in the engine. The timing is set correctly, it has the correct plugs etc. It shoots plenty of water out of the exhaust port in the sterndrive. I have tried several different pitch props in case I was loading the engine..all the same problem with any of them.
I have taken the heat exchanger apart and cleaned it with Muratic acid to remove the scale, picked out the 3 or 4 small pieces of junk in the fins.
So what now...any suggestions?"