Packard Forum Index » V-8 (1955-56)

Packard had a floating oil screen. Here is the theory behind it as described in an earlier fact book showing an inline 8 pump and pan. While not described in detail in the V8 books it was in all engines made thru 56.

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Yes and fun fact, the resting position of the oil pickup is exactly 4½° below horizontal.

Packard for many decades employed a "floating pickup" combined with bypass oil filtration, to provide superior filtration with a single filter. Bypass filters filter out smaller particles than do full flow filters. The floating pickup is intended to pick up the cleanest oil as heavier particles sink, ensuring no large particle gets circulated.

I just replaced my pump several days ago with Jack's Olds kit. In addition to the rigid pickup, I also noticed that the pickup sits higher than the Packard original, like about an inch. I take this to mean you won't want to let your oil level get low or you'll soon be sucking air.

On the upside, with the standard Olds Melling pump with stock relief valve spring (it came with a "high pressure" spring for optional installation), I've got great oil pressure on my formerly rebuilt V-8 and the lifter ticking is now gone. I did not opt for the high pressure spring as I expected it would not increase idle pressure but would boost the higher rpm pressure more than really necessary. I'm observing a steady almost 3/4 scale indicated pressure on the gauge at all rpm.

One surprise when I disconnected the internal vacuum tube to the vacuum booster is that it was mostly full of engine oil. The oil pump bushing appears to be tight, no play. I've not yet disassembled the original pump but am thinking the air ingress is from the vacuum booster rather than the shaft.

Jack,

Does the Olds conversion work on a "Hash" V8? Or does the oil pan need swapped out?