Re: '38 six cyl question wrong oil filter? Really ready to start

Posted by HH56 On 2019/9/9 12:11:51

Depends on the filter. The prewar factory canister type filters appears to have needed an orifice added as when the bypass filter plumbing was adopted Packard issued an article advising mechanics to solder a fitting closed and then drill a specific size hole thru the solder to ensure a restriction was in one of the fittings. After the filter plumbing change the factory supplied brass blocks or elbows had the orifice already incorporated.

Postwar factory filters appears to have had the orifice in the filter assy which consisted of one or two small holes drilled in the center pipe. Aftermarkets probably had the same arrangement. I would examine your filter carefully to see if it has the one or two fairly small holes (1/16" or less) in the center pipe. If larger or if there are multiple holes, does one of the side outlets in the 4 way brass block at the engine or one of the 90 degree elbows on the filter have a small hole in the port. If the filter has been on the engine all these years chances are there is an orifice somewhere and the rubber hoses are just a connection.