Re: The Duchess Project: 1940 Super 8 Convertible Sedan

Posted by HH56 On 2014/6/7 15:04:04

I believe the canister you have is a later one which used a small hole in the center tube as the restriction in place of the small orifice in the bottom fitting. It might even be an aftermarket. Factory filters I remember seeing from earlier cans which had the inlet at the bottom had more than one hole in the center post. Those are the ones that had to have a fitting with a small orifice to limit flow. That canister you have does make it surprising your lifters were happy all these years.

Not sure which return hole you are speaking of when you say halfway up the block. I assume you mean the port above the tees and gauge sender which is the feed directly to the tappet gallery. The added filter only return hole was drilled so oil dropped into the crankcase just below the oil filler tube. That location & instructions for drilling is shown in the service letter 15#12 which is available on site for download. Still later engines like Joe's and mine have it cast in the area where the oil pan bolt holes are located.

Logically, the filter should work either way but IMO, if oil enters the side there would be more filter surface to trap dirt and the filter should last longer than if it has a center inlet & all the dirt is concentrated in the small center section. Not sure when Packard changed from the center inlet to the side inlet. Big Kev has one of the early bottom inlet types and I believe he has reversed his.