Quote Originally Posted by snow#33 View Post
I am having the same exact overheating issues that you described. I have the same motor as you also. I am having a hard time understanding where exactly the O-Ring you replaced is located. is there any chance you have any pictures of the Thermostat riser connection or the new gasket that you made
We have seen two 8.1s this year with this same issue. The seal is on the bottom of the heat exchanger at the front where it is clamped down to the riser. When replacing the seal check to make sure the sealing surface is not bent (usally the reason it isn't sealing well) If it is you'll need to straighten it out.
We are stocking the seal if you need it at AK Frontier Fab. 907-357-9324
Best of luck on the repair. If you need help give us a call.

Mel