Re: Why do Valves Stick?

Posted by HH56 On 2013/7/6 19:13:52

... et al, why is ventilation a factor?

Condensation is the one Packard was most concerned about. Mostly due to short engine runs and then storage. Under those conditions, lack of ventilation allowed moisture to collect on the valve stems and then rust. Low air flow also resulted in heated oil vapor not circulating inside the engine and depositing on various items. On the 356 engine they actually resorted to the little horizontal tube which catches air flow from fan and feeds it into the oil filler cap to force ventilation.

There are about a dozen articles on various sticking valve issues giving some reasons and methods to help correct them. Starts around 1939 service counselors and going thru 43-44. The 37-42 service index engine listing has the exact issue info.