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Author Topic: EVO Oil line routing to oil filter  (Read 1689 times)

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March 01, 2020, 06:09:53 PM
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GreatGrandPaw


While changing my '96 FXSTS oil, I noticed in several official Harley publications, including the service manual and instruction sheet J00715 for an oil cooler kit, that they show the outside line of the filter housing to be the inlet and the inner line to be the outlet.  That seems backwards.  On my '96 FXSTS, the inner line is fed from the oil pump.  It feeds into a cavity which then feeds into the holes of the filter end cover which has the mounting threaded hole and gasket.  The flow passes through the holes of the end cover, through the filtering material to the center of the filter, and out the threaded mounting hole and exits from the inner hose connection of the filter housing and back to the oil tank.  My horseshoe tank has the connections at the bottom.  Besides the supply line to the oil pump, there are two lines which are for vent and oil return.  I've seen different versions of which is which, but they both dump at the top of the tank.  I think they could be interchanged.  The inner one might dump a little further from the oil pump  feed line if that is a consideration.

March 01, 2020, 07:24:18 PM
Reply #1
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HDBitchin

Administrator
The below PDF is scanned from my 1995 -1996 Softail Service Manual. That should be what you would want on your 1996 Springer Softail.

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March 02, 2020, 02:32:28 PM
Reply #2
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GreatGrandPaw


Thanks for the reply.  Your picture shows the outer line as "oil pump feed to filter" which I interpret to mean that line is carrying oil under pressure from the oil pump.  Again, this what some of the other HD schematics show.  But, upon inspecting the filter housing, that would force the oil to flow from the center of the filter through the filter media and out the small holes in the filter end cap.  That would be the opposite direction for which this type of filter is designed. The bypass valve depends on the flow going toward the center of the filter after entering through the holes in the end cap or "base cap".  Just say'n.  Far be it from me to criticize an official Harley manual or bulletin, but it just doesn't add up. 

March 02, 2020, 03:57:01 PM
Reply #3
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HDBitchin

Administrator
This forum thread below has a couple videos about oil filters and the video done by S&S details the difference between the Evo and Twin Cam filters.

https://hdbitchin.com/index.php?topic=3088.msg28986#msg28986

The S&S video might be helpful in the understanding of the oil line routing that an Evo has and Twin Cam will not have.
HDBitchin aka Tank
AMA Member- Click Here to Join
When shopping for anything look for Made in the USA and save American jobs and families


March 02, 2020, 06:14:43 PM
Reply #4
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maniacmac

Global Moderator
Oil does flow from the center to outer on almost all oil filters

March 03, 2020, 10:53:47 AM
Reply #5
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GreatGrandPaw


The gentleman in the video said that the oil flows through the holes to the outside of the filter then to the center and out the threaded hole which is the way this type of filter is designed.  WIX has a video showing the flow direction for a spin on filter and it goes through the holes of the base plate and through the media to the center.  The bypass valve would not work if the flow went the other way.

March 03, 2020, 01:50:56 PM
Reply #6
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AbueloBill

Supporting Member
This forum thread below has a couple videos about oil filters and the video done by S&S details the difference between the Evo and Twin Cam filters.

https://hdbitchin.com/index.php?topic=3088.msg28986#msg28986

The S&S video might be helpful in the understanding of the oil line routing that an Evo has and Twin Cam will not have.
FWIW, the HD Service Manual for my 2016 Sportster has a multi-color foldout lubrication diagram.  The oil is shown as under pressure and into the filter at the outer holes with the return out the center to the ball valve.
If you are not part of the solution you are part of the precipitate.

March 03, 2020, 06:44:33 PM
Reply #7
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GreatGrandPaw


Correct. 

March 27, 2021, 06:27:37 AM
Reply #8
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Nowhereman

Supporting Member
I know this is an old thread but I have to chime in.
I had the disgusting time of having an oil bung from the tank break off at 85 mph sometime ago on the freeway.
Weld just gave up the ghost after 21 plus years of riding.
Needless to say oil pumped out all over the place. Made it to the side of the road and shut her down.
Buying and after market tank replacement for half the cost of the HD unit, I pulled up a well used an known diagram to review to insure correct line routing.
Guess what? the routing shown was wrong as I had to swap out the front and middle line which are the vent and return.
Even when you go by the book, the book is sometimes wrong.
Pulling up a photo from a well known website that showed a softail line routing, it showed what I found out, not the schematic.
If you have to swap oil tanks for some reason, keep some pipe cleaners with your tool set.
They work out superbly seeing where the bungs really rout through in the tank.
- Nowhereman


 




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