jhall Posted January 18, 2005 Report Share Posted January 18, 2005 Bbobynski, I've pulled down the heads on a N* from a '97 Deville. A close look at the valves indicated stem seal leakage based on the oily carbon built up on some of the valve stems. The exhaust valves are covered with some seriously hard deposits. Some of the exhaust valves and seats have slight pitting. Some exhaust valves also have slight grooving at the face (a machine shop, and possibly some new valves, appear to be in my future) During the teardown and inspection, I noticed that the upper spring retainers (where the keepers are installed) have what appear to be stress cracks in the metal. See photo. Have you seen this before? I assume I'll need to buy new ones. Most retainers (intake and exhaust) have some level of cracking just like this, but I'm not sure if this is a typical or something that needs to be replaced. My engineering background tells me this is material fatigue and they will fail. Any comments appreciated. Link to comment Share on other sites More sharing options...
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