Quote:
Originally Posted by Marrk
I'm sorry, but one of us is deeply confused.
Valves are a wear item. They have to be adjusted. Not only that, but a shim-type adjustment usually requires removal of the cams. And, of course, you need a shim set or access to one. In other words, it's a big job. Rocker arms with screw-type adjustment are another story.
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Maybe I'm using the wrong terminology, I don't know, its been awhile since I've had to deal with this (I've been working with the old OHV Subaru motors lately more than the new stuff).
The DOHC EJ's used buckets and you don't replace those unless you are doing a full valve job. They are considered a non-maintenance item. Here is a photo of the old style buckets on the left, and the new FB style valves on the right:
http://car.watch.impress.co.jp/img/c...ml/16.jpg.html
As for the new motors, not sure. I do know the shims on the EZ 6-cylinders are also non-maintenance not to mention ridiculously expensive ($75+
each) and the EZ motors are closer in design to the FB motors.
Either way, unless you had something go wrong, like a burnt valve or headgasket blow, or installing new cams, you won't have to worry about this at all.
Edit: Here is the maintenance schedule for the 2012 Impreza with the FB20 motor, 105,000 miles or ~10 years, inspect valve clearance. Thats it. I know for a fact that dealers DO NOT do this inspection unless something is actually wrong with the car.
http://www.cars101.com/subaru/maintenance3.html