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1977 911S Warm Running Engine

Engine

Vehicle Information: Model: 911S; Year: 1977; Body Type: Coupe; Total Mileage: 100000;

My 2.7 engine is running very warm at 240F. I am pretty certain that theoil thermostat is not opening. With the engine hot I can hold the lineexiting the thermostat and it is not hot to touch. The oil cooleritself, is cool to the touch. Is it a common problem for this to happen.Can I rebuild this unit? Any suggestions?

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