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Buell Forum » Old School Buell » Archive through April 15, 2018 » How important is the anti drain back valve on oil filter? « Previous Next »

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Imadog
Posted on Thursday, April 12, 2018 - 12:21 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Hi... getting ready to change the oil and filter. Amsoil 20W-50 V-Twin oil and the EAOM134 filter. Last filter I had was the EAOM135. The only difference is the 135 does not have the Anti Drain Back Valve. How important is it???? I have had this filter on for several years. Thanks.
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Purpony
Posted on Thursday, April 12, 2018 - 12:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Ive been running an EAOM134 on my bike for the last 8 years. No issues-
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Ratbuell
Posted on Thursday, April 12, 2018 - 01:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
I just don't like the potential dry-start scenario, especially on a dry-sump engine. Sure it's only for a split-second, but multiply that by however many starts in a month or in a year...
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Natexlh1000
Posted on Thursday, April 12, 2018 - 03:40 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Isn't the filter on the return line to the tank?
It is on my ironhead. I just assumed it was "the way it is".
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Screamer
Posted on Thursday, April 12, 2018 - 03:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Filter is on the feed circuit, after the pump and prior to feeding any engine components.
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Odd
Posted on Thursday, April 12, 2018 - 06:29 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
someone can correct me if I'm wrong but the oil check valve on Buell's is behind the oil adapter where you screw on the oil filter.
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Imadog
Posted on Friday, April 13, 2018 - 01:22 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Thanks for the replies. I believe the Big Twin Harley's up to 1999 used to have the oil filter on the return side and did not need the Anti Back Flow Valve, that is why Amsoil offers the EaOM135. Looking at the FSM the Sportster engine obviously needs one.


FSM Oil Flow Diagram
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