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Old 09-28-2012, 07:27 PM   #26
k mier
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Quote:
Originally Posted by Vlad View Post
The lifters are hydraulic. They are supposed to take up clearance with oil pressure.
Just curious, did the factory procedure call for you to check the clearance after the oil drained from the heads?
I wonder how long that may take with a synthetic oil and capillarity keeping it in place..
?????
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Old 09-29-2012, 02:14 PM   #27
SubieWolfSti
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The procedure only called for removing the valve cover and checking the clearance when the motor was completely cold. This in turn, means the majority of the oil was drained to the pan.
Also, i bealieve that engine oil will not take up a .008 or .013 clearance which is the factory spec clearance for the STI motor.
Lastly, from what i have expirience on other motors, valve clearances get smaller as more miles are put on the car, meaning the valves get closer to the lifters until you have a tight valve. Which gives you problems such as mine.
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Old 09-29-2012, 09:53 PM   #28
k mier
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So I take it you didn't have to replace the lifters? um.......anyhow..

That's been my experience with 4 stroke mx bikes also. The valve tulips into the seat or the seat wears which makes the valve seem to grow longer. On some of the bikes you can even hear a solid kind of sound when one gets too tight.
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Old 09-30-2012, 04:45 PM   #29
SubieWolfSti
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The procedure to check the clearance is one part,if they are ok then your good. to replace the shims is another more painfull process.
I actually did replace the lifters on cyl. 2 and 4 and placed them to factory spec. It required removing the cams and measure the lifters along with some math to pick the right shim.
Do bmx bikes mention anything on checking valve clearance after its been ran a certain ammount of hours? just curious because i've been contemplating getting a bike.
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Old 10-01-2012, 12:07 AM   #30
k mier
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The lifter part was just poking fun at the, "our lifters are hydraulic", where are you finding a hydraulic lifter on that head?

yes, mx bikes need their valves checked, owners manual will elaborate.
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