On Sun, 31 May 2009, Sally or Dick Taylor wrote:
> Don---Thanks for continuing on this. Maybe I just have the filter parts
> stacked wrong, but it looks like oil can't go anyway but thru the middle
> of the filter to the outside..
I managed to find my old filter housing, and I think I see what you're
saying. But the obvious spring that presses against the housing and
filter spacer/centerer at the bolt head is not the by-pass spring, it just
holds the spacer and thus the paper element against the block and doesn't
move nor change it's pressure as long as the filter is in place.
Look closely at the inside of that round spacer, there's another spring
inside of it that IS the by-pass spring, this is the spring that gets
compressed by the oil pressure coming from the outside of the filter.
You're assuming that the spacer flange is the bypass valve seat.
Rather, the valve seat is inside of the spacer and is lifted open going
the other direction.
That's got to be how it works. All round filters filter outside-in, I've
never heard of an exception to this rule. It's also what the Bentry
manual shows.
It's not necessarily intuitive, but that's my story.
Regards,
-Don
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