D2 3j

Probably your best bet is to use search function at top of the page. I ran it using "bypass filter "and found this thread that has some pictures of one of the rarer early ones. This topic has been discussed a lot and if you look at the threads that show an attachment, you will hit some pictures and scans that might help. I didn't find any other promising threads in the rest of the search pages.

There is a reference area on this site that should have information on this topic as often as it has been discussed.

If you don't find what you need, post your serial number and pictures of what you're looking at. This may be required anyway because some of these filters have been modified incompletely or using non CAT parts etc over the years and who knows if what you have is shown in any parts diagram or not.

Link..www.acmoc.org/bb/showthread.php?17921-1939-D2-3J-Oil-Filter/page2&highlight=bypass+filter

does this help?

[attachment=28194]Scan0005.jpg[/attachment]

Is the base is the same on the rare early ones as the more common ones? My operators instruction manual shows the short element type supplementary filter in it, but does not show the spring/ ball configuration.

my 5J parts book shows 6 different filter assemblies depending on serial #---along with a field installation filter. some have a spring and a plunger
as ccjersey sad a picture and serial # would help to identify what you have

[attachment=28195]oil filter image.jpg[/attachment] this is the setup shown in my manual that is exactly like the one on my cat.

To be correct it should have a plunger, not a ball. The plunger should face down with spring behind it then the retaining cup with cup also facing down.

Thank you that's exactly what I need to know... I still don't get how the oil flows through the filter. Thanks Thomas