Oil in the Heater Box's

[jetkona]

I have been methodically working on numerous oil leaks in my 74 911s. It appears though that there is oil getting in to the heater box (primarily on the passenger side). Not bad enough to drip but enough to burn and smoke after a bit of driving.

Originally, I thought that it had gotten there from the valve covers. I have pretty much stopped that leak though and the heater boxes still smoke and show visible wet oil on them.

What is the most likely source of that leak?

Thanks........JT

[chuckw951]

Check the engine oil cooler thermostat. There is an O-ring there that sometimes leaks. Or the oil pressure idiot light sender. Also check the oil return tubes under the motor.