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  #16  
Old 02-21-2007, 05:54 AM
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Not worth doing if less that one quart oil consumption per 2500 miles in my opinion. Great that you have one of those engines with very little or no apparent blowby as well. Of course it will do no harm particularily if you do the valve stem seals as well.
I still doubt they are the cause of what you mentioned. A person cannot be absolutly certain though. I would still like you to post what mercedes has to say about the guides and seals if it is possible for you to do.
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  #17  
Old 02-21-2007, 09:35 PM
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Originally Posted by tobybul View Post
No oil consumprion, no blowby. Just oil stains around breather on valve cover.
I'm missing the reason to attempt the replacement of the valve seals???
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  #18  
Old 02-21-2007, 10:36 PM
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Originally Posted by Brian Carlton View Post
I'm missing the reason to attempt the replacement of the valve seals???
Its the evidence of oil stains around the breather hose and what I read that worn valves cause that to happen. Also, that worn valve seals allow compression pressure to let oil by the seals and blow oil out through the breather and the air cleaner.
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  #19  
Old 02-21-2007, 10:57 PM
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Originally Posted by tobybul View Post
Its the evidence of oil stains around the breather hose and what I read that worn valves cause that to happen. Also, that worn valve seals allow compression pressure to let oil by the seals and blow oil out through the breather and the air cleaner.
The SD gets some oil stains around the breather hose on the top of the valve cover........it's got brand new exhaust valves and new guides and new seals...........I'm still not grasping the relevance??

You've got no blowby and no oil consumption..........therefore, the valve seals are fine.
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