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One stubborn exhaust valve on a 737 took me 14 hours across 3 shifts
Finally found it was a hairline crack in the guide that only showed up after I pulled the whole assembly and ran a borescope at a weird angle, has anyone else had a part that just refused to make sense until you got it on the bench?
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casey34225d ago
Pulled a cylinder on a Lycoming years back for the same kind of ghost, ran compression fine cold but would drop once things warmed up. Turned out the guide was walking just enough to lose clearance, and you'd never catch it with the jug bolted on. My trick now is heating the assembly with a heat gun while you wiggle the valve, cracks and loose guides show up way faster than hunting with a scope. Also check the guide to head fit, not just the guide to stem, that's the one that bit me.
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