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Valve Clearance Question
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<blockquote data-quote="Fred W" data-source="post: 1411409" data-attributes="member: 3828"><p>The ring free treatment is most important for the exhaust valves, which tend to get carboned up causing those clearances to appear to grow. If you see the exhaust clearances are too big, dont believe it and start reducing the clearance. It is far more likely you have carboned up valves than anything wearing in a way to increase the clearance.</p><p></p><p>Excess clearance is really not much of a problem for the engine anyway. Its too little clearance that matters.</p><p></p><p>The intakes are regularly washed with fuel mixture and so you tend not to see the growing clearances on those. What you will see on the intakes is the clearances getting tighter over time due to the seats wearing from constant hammering by the (clean) valves. Those are the ones you want to reshim to the 70th percentile of spec so you never have to do it again.</p><p></p><p>Because they generally have some amount of carbon deposit on them all of the time, the exhausts tend not to wear as fast as the intakes, if at all. Most of the time a reshim is just pulling out the intake cam. But at that point you might as well adjust all 8 intake valves.</p></blockquote><p></p>
[QUOTE="Fred W, post: 1411409, member: 3828"] The ring free treatment is most important for the exhaust valves, which tend to get carboned up causing those clearances to appear to grow. If you see the exhaust clearances are too big, dont believe it and start reducing the clearance. It is far more likely you have carboned up valves than anything wearing in a way to increase the clearance. Excess clearance is really not much of a problem for the engine anyway. Its too little clearance that matters. The intakes are regularly washed with fuel mixture and so you tend not to see the growing clearances on those. What you will see on the intakes is the clearances getting tighter over time due to the seats wearing from constant hammering by the (clean) valves. Those are the ones you want to reshim to the 70th percentile of spec so you never have to do it again. Because they generally have some amount of carbon deposit on them all of the time, the exhausts tend not to wear as fast as the intakes, if at all. Most of the time a reshim is just pulling out the intake cam. But at that point you might as well adjust all 8 intake valves. [/QUOTE]
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Valve Clearance Question
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