Number 4 was replaced due to low compression (exaust valve). number 2 was running hot before that and now the pilot says it's hotter. Silicone seals,look good and tight with the cowl installed,all new gaskets,rechecked the bolts. compression is good. We called the engine shop and they are stumped at this point. Back on it monday morning.
This is commonly done, incidentally, by sealing off the induction, ensuring both valves on the cylinder in question are shut, and pressurizing the induction with a low pressure source (typically the output from a shopvac). Use soap bubbles at the induction flanges and couplers to spot a leak.
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