I am in the process of obtaining parts for a timing belt change on my 98 Outback with the 2.5. 

 

I ordered a kit that includes 1 tensioner, 2 upper idlers, 1 lower idler, 4 camshaft seals, 1 crankshaft seal, water pump, and the belt.  I also plan on doing a coolant flush and change along with the thermostat. 

 

So what am I missing that should be changed out along with the above list.  The engine has 156,000 miles on it.  Head gaskets have been redone and no noticeable problems.    

Check oil pump screws.

 

Accessory belts

since ur doing everything mine as well do plugs wires oil and air filter and if it was mine i would seafoam it befor doing all that work

Oil change hoses and a tune up go without saying,. 

 

I am the kind of person that plans something out 6 months ahead of time just to make sure that I have all the necessary parts.  The nearest Subaru dealer is 60 miles away.