Dman1991
Member
- Mar 20, 2018
- 32
- Boat Info
- 197i srv 260 twin 470 mercruiser Ann's mercruiser alpha 1 stern drives
- Engines
- Twin 470s with alpha 1 stern drives
Hey guys i have a 1978 srv 260 with twin 470s.. both engines run top knotch. My issue is with the cooling system one engine temperature gauge creeps up and up and up until i pull it back off plane. I can run them both at 2500 or less there fine as soon as it starts pushing water to plane it creeps up i can run on plane for about 3 min before it gets to 190 where i slow it down other engine runs 165 all day reguardless.. my question is how often is it that its an impeller issue in the outdrive?? I took off exhaust manifold and thermostat replaced, the manifold exchanger was clean of debris. Have not checked the 4 inch round heat exhanger but water flows good on the ear muffs when running out of water.. what do you guys think?