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  1. #1
    Senior Member yegg's Avatar
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    Sep 2015
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    Virginia
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    Engine Oil Disappearing

    And the hits keep on coming.

    I checked my engine oil the other day and found it VERY low. It took two quarts to bring it back up to where it should be. I have no been able to check the primary yet to see if that is where it is going. I mention that as I do not have any ground oil and I do not think I'm burning it. On the other hand, I would have thought that 2 additional quarts in the primary would have had some affect. Am I wrong about that? I have read that excess fluid in the primary causes clutch slipping and/or difficulty finding neutral. I have neither symptom. I have noticed that my oil pressure seems to be on the high side. What should it be for a stock motor (except for stage 1)? Next weekend I plan to remove the derby cover and see where my fluid level is. If it is much higher than normal I am going to tear down the primary. I really don't want to do this again any time soon so what seals should be replaced while I am there? Also, is there another possibility for my disappearing oil?

    It just seems like everything is going at 50k. :

    Ride safe.
    Ride Safe,

    Elliott
    2015 FLHXS - Amber Whiskey

  2. #2
    Administrator hulkss's Avatar
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    Luck
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    Wisconsin
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    Quote Originally Posted by yegg View Post
    And the hits keep on coming.

    I checked my engine oil the other day and found it VERY low. It took two quarts to bring it back up to where it should be. I have no been able to check the primary yet to see if that is where it is going. I mention that as I do not have any ground oil and I do not think I'm burning it. On the other hand, I would have thought that 2 additional quarts in the primary would have had some affect. Am I wrong about that? I have read that excess fluid in the primary causes clutch slipping and/or difficulty finding neutral. I have neither symptom. I have noticed that my oil pressure seems to be on the high side. What should it be for a stock motor (except for stage 1)? Next weekend I plan to remove the derby cover and see where my fluid level is. If it is much higher than normal I am going to tear down the primary. I really don't want to do this again any time soon so what seals should be replaced while I am there? Also, is there another possibility for my disappearing oil?

    It just seems like everything is going at 50k. :

    Ride safe.
    There is only one engine dynamic seal. It is behind the alternator on the crankshaft. If bad, the engine can leak into the primary.
    2019 FLHCS

  3. #3
    Prospect
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    Nov 2015
    City
    Ham Lake
    State
    Minnesota
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    1
    Hello, Iím new her regardless of what the date says so I apologize in advance for any poor forum etiquette as Iíve never been on one.
    There is a good chance you may not notice excessive fluid in your primary depending on how you ride. Normal oil pressure for me has been 30-45psi if I remember correctly.
    I had a very similar problem with my bike consuming oil, it would be a quart low in a long day of riding. No smoke, no extra oil in primary. It turned out to be rings/ jugs out of round. This was somewhere in the middle of an endless never solved crankcase breathing problem that also cost me a lot of oil but that is a different topic. Iíll cross my fingers that itís burned or in the primary for you, better than doing a top end....unless of course you want an excuse for upgrades, in which case, Iím afraid itís your rings, theyíre bad😉

  4. #4
    Prospect FLHXSrider's Avatar
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    Mar 2015
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    Edmonton, AB Canada
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    I experienced similar symptoms with my 2015 FLHXS at around 71,000 miles. No burning, no leaks but oil was disappearing in large quantities. I was averaging 600 miles a day and usually had to add a quart every day. Before I realized that some of the oil was going into the Primary, it also developed a small leak on the rear head. The head leak was way too small to account for all the oil I was losing though. In the end, I upgraded to an S&S 111" and the problem is solved. Probably not the solution you're looking for, but it worked for me, Lol.
    2015 Vivid Black FLHXS S&S 111" wi/ 585 Cams, S&S Stealth AC & Tear Drop cover, 58 mm TB, V&H Power Duals, S&S 4" Slash Cut Pipes, Power Vision & TT, Comp. Elim. Sprocket, Scorpion Clutch, Baker Att. Adj, Biketronics 7Ē speakers and amp. H-D Hammock seat, JW Speaker LED light & Daymkr Aux lights. Cust. Dyn. LED turn sig. & magic strobe, H-D Heated grips, Detach H-D King Tour Pack, Willie G (Derby cover & Fuel door), axle covers & 3 pocket dash bag.

  5. #5
    Founding Member BlkDragon's Avatar
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    Jul 2015
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    East Valley
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    Arizona
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    I am on my 2nd engine upgrade, first one on my way back engine oil went low and started to make noise so I pulled over and check and found very low where it'll not register. I ended up filling it up with 2qts and rode home from Laughlin. Once I got back, dropped it off at the shop, found bad news to the jugs so another engine upgrade. Now I am checking my engine a lot and still seeing disappearing engine oil. Not burning, no leak, primary is not over filled so what's going on. I had the shop check and shop told me everything is good and just keep checking and fill as needed......WTH? Never had this issue with my other bikes, I am really getting to a point ready to ditch Harley product all together. Indian Challenger is starting look good.

    I have also read somewhere that Harley engines are known for this, is that the fact?
    '15 FLHX, Vivid Black with S&S performance mods & aftermarket accessories!


  6. #6
    Administrator Mojo's Avatar
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    Nashville,
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    Tennessee
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    BlkDragon I've had 3 different M-8's and never had this problem.
    2018 FLHXANV
    Milwaukee Eight 107 l Reinhart Slip Ons l 4 Point detach l Low Pillion l ClearView Shield l Fairing wings l Fork deflectors
    Custom Dynamic Fr LED's l Halo headlight l Ciro tail & bag LED lights l Chrome forks/calipers/Chrome Enforcer wheel l
    115 Anniversary Chopped Tour Pak
    .l Chrome Controls l Painted Fairing l Boombox GTS-Boom ll Speakers l Hard Lowers
    l Alarm.


  7. #7
    Senior Member yegg's Avatar
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    Update:

    OK, so I finally got around to getting my bikes to my new house and finding time to check into this further. I was going to do a fluid change and decided to check the level in my primary first by pulling the derby cover. Oil started spilling out as soon as i loosened the bolts holding it in place. I guess I found out that oil is crossing over from the crankcase to the primary. Is this the seal that sits in the inner primary housing or is it actually in the crankcase?

    If I am not mistaken the inner primary case has three seals (main seal between the crankcase and primary, the starter motor, and the shift shaft). Is that correct?

    Thanks.
    Ride Safe,

    Elliott
    2015 FLHXS - Amber Whiskey

  8. #8
    Senior Member yegg's Avatar
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    Quote Originally Posted by hulkss View Post
    There is only one engine dynamic seal. It is behind the alternator on the crankshaft. If bad, the engine can leak into the primary.
    I finished the tear down this evening and I think you are correct as to where the leak is. I'm sure I'm being dense, but does the stator sit in oil or should it be bone dry in there?

    I haven't found a lot of information on replacing the seal behind the stator but I do have one. Is it simply as straightforward as removing the old one, using assembly lube on the new one, and then pressing it into place? Is a special tool to set the depth recommended?

    Is it considered good practice to replace the shift shaft seal and the seal in the backside of the inner primary housing that is behind the clutch while I have everything apart (again)?
    Ride Safe,

    Elliott
    2015 FLHXS - Amber Whiskey

  9. #9
    Administrator hulkss's Avatar
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    Watch This, just get the twin cam tool if it's different.
    2019 FLHCS

  10. #10
    Senior Member yegg's Avatar
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    Thanks! I ordered the tool yesterday. Until it gets here Iím just going take more pieces off and clean. Iím also kind of tempted to install a compensator eliminator but Iím still trying to figure out which way to go.


    Sent from my iPhone using Tapatalk
    Ride Safe,

    Elliott
    2015 FLHXS - Amber Whiskey

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