Re: Zero Oil Pressure 1948 Packard

Posted by HH56 On 2020/10/6 16:50:32

Packard used the bypass system where about 10% of the oil is passed thru the filter and the rest is delivered straight to the bearings. Eventually all the oil makes it thru the filter so it evens out over time. Back in the day filters were not so common and Packard was not the only mfg that had them as options. Packard made them standard on engines with hydraulic lifters and optional on models with solid lifters. The filters were plumbed in many different ways in the early days. The 40 356 engines with hydraulic lifters is where they started having issues with filters clogging and low flow resulting in noisy lifters. Several filter changes and replumbing attempts were made before settling on the flow path and characteristics that lasted on all engines thru 54.

Check out this thread. It is a later engine but same block and setup as your 48.

There are a couple of photos in the thread that show the pickup clearly but the only one I have showing the pickup mounted in the entire assembly as it sits in the car has the pin or cotter key area kind of hidden. My photo was taken by a friend for an entirely different reason. It shows what can happen in long sitting engines when mice find an opening and take up residence.

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