I have not. That looks like a gasket though, not an o-ring?

At first glance it seems pretty straightforward to replace. Some general tips based on other cooling system work I've done in the past:

1. Clean mating surfaces thoroughly
2. Torque the bolts gradually to spec, alternating between tightening each of them until both are to spec (I can try to find it in the FSM if you need it)
3. Plan on topping off with Subaru Super Blue coolant and diligently work through the air bleeding to get rid of the air bubbles you introduce.

 

I have not. That looks like a gasket though, not an o-ring?

At first glance it seems pretty straightforward to replace. Some general tips based on other cooling system work I've done in the past:

1. Clean mating surfaces thoroughly
2. Torque the bolts gradually to spec, alternating between tightening each of them until both are to spec (I can try to find it in the FSM if you need it)
3. Plan on topping off with Subaru Super Blue coolant and diligently work through the air bleeding to get rid of the air bubbles you introduce.

Yeah, at first I thought it's a gasket, but looking at the drawing it says o-ring- a $3.13 item.:frown2:And looking at the diagram, there's no flat gasket? Yes, if you can look up the recommended torque for the bolt that would be awesome. Oh, I completely forgotten about the coolant. Thanks for the reminder! I might as well do a drain/flush service the radiator with this job.

 

I'm struggling to find this in the FSM. You may just have to figure out the bolt size and google "metric torque values" to match a general recommendation for those bolts.

 

Engine Section (H4SO)/Mechanical (H4SO)/Cylinder Block/Installation. Possibly in other places as well, but not in the usual breakdown diagrams at the beginning of each section.

 

5 ftlb according to:

 

1AAuto , you're seriously dropping the engine to replace 2 o-rings??? Thanks for the practical video