Riptide Posted September 1, 2017 Share Posted September 1, 2017 I have a 2005 GT with 94,000 miles on it. I have heard that the valve clearance is supposed to be adjusted at 100,000 miles. True? What is the consequence of not doing this? I have heard it is a pita because the engine has to be pulled to accomplish it on this car. Link to comment Share on other sites More sharing options...
MilesA Posted September 1, 2017 Share Posted September 1, 2017 Valve clearance should be checked. It's possible adjustment is not required. Most people ignore it until they start getting symptoms of a problem. The consequence of running too tight valve clearances is burned valves. That means you will need your heads rebuilt sooner. I have seen a special tool that allows bucket shims to be replaced without removing the engine from the car. It is expensive, but probably makes sense for shops that do a lot of Subaru work. Link to comment Share on other sites More sharing options...
Riptide Posted September 1, 2017 Author Share Posted September 1, 2017 How about a leak down test rather than pulling the engine? Better than nothing? Do a lot of people let this sail or is it more common to spend the bucks and have the job done? Link to comment Share on other sites More sharing options...
Moderators BarManBean Posted September 1, 2017 Moderators Share Posted September 1, 2017 If you are not having any misfire issues and you don't need to replace valve covers to solve a leak or anything, don't screw with it. If you are pulling a valve cover for any reason, absolutely check your valve clearances while your are there--it can be done with motor in the car. "Bullet-proof" your OEM TMIC! <<Buy your kit here>> Not currently in stock Link to comment Share on other sites More sharing options...
MilesA Posted September 1, 2017 Share Posted September 1, 2017 Agreed, a logical time to check valve clearance if you have to replace the valve cover gaskets. Another opportunity is when you do the timing belt service which is officially every 105,000 miles or 105 months. Remember, checking clearances doesn't necessarily mean any shims have to be replaced. Also, clearances typically change very slowly over time, so don't worry excessively about it. Link to comment Share on other sites More sharing options...
xt2005bonbon Posted September 1, 2017 Share Posted September 1, 2017 And yes. If you have to, you can change buckets with the engine in the car as I did here. You'll have a stronger lower back once the work is done . Link to comment Share on other sites More sharing options...
1-3-2-4 Posted September 2, 2017 Share Posted September 2, 2017 I have seen a special tool that allows bucket shims to be replaced without removing the engine from the car. It is expensive, but probably makes sense for shops that do a lot of Subaru work. On the older EJ25D's yes I can see that it was just the shim that needed changing but on these the whole bucket has to be changed.. I just not too long ago changed out 5 buckets it's not cheap but I know one of my valves on the drivers side for cylinder #4 only had 0.16 clearance when it should be 0.35 Link to comment Share on other sites More sharing options...
Riptide Posted September 2, 2017 Author Share Posted September 2, 2017 Is the tendency for the clearance to get looser over time or tighter? Link to comment Share on other sites More sharing options...
1-3-2-4 Posted September 2, 2017 Share Posted September 2, 2017 Is the tendency for the clearance to get looser over time or tighter? tighter Link to comment Share on other sites More sharing options...
xt2005bonbon Posted September 2, 2017 Share Posted September 2, 2017 yeah. Tighter, particularly on the exhaust valve side. Mine (one exhaust valve that is) had literally zero clearance! Link to comment Share on other sites More sharing options...
ehsnils Posted September 4, 2017 Share Posted September 4, 2017 Too loose clearance (within reason) is usually just noisy with valve clatter, too little and you'll get misfires and burnt valves. Link to comment Share on other sites More sharing options...
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