Question about 1993 Harley Davidson FLSTF Fat boy

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Engine oil leak out the left side of 1993 harley davidson evolution engine.i replaced the deal & it is still leaking.what else do i need to look for?

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  • bigwoody1958 Apr 27, 2010

    Definately not the primary.It is an open belt.It is leaking from the engine.I replaced the seal & the steel bushing that goes around the crankshaft that the seal rides on.When I took it apart to replace the seal I noticed that the seal I was taking out was installed backwards so I know someone had been into it before me.No noises in the engine & it runs strong.I was wondering if behind the seal & the crankshaft bushing if there is some other kind of shim, oil slinger or something that rides against the main bearing missing that would help keep the oil in the cases.There doesnt seem to be any side play in the crankshaft.I cant see a crack in the cases but I know that could be a possibility.It leaks a puddle of oil the size on a softball in a matter of 4 to 5 minutes.I cant find a book or anything on the internet to show a breakdown of the engine.Thanks for your time & help.

  • wd4ity
    wd4ity May 11, 2010

    Are you sure it's engine oil and not primary lube or transmission lube? Is the leak towards the front of the engine or near the rear of the engine? Which seal did you replace? The 94 and earlier models had the older design final drive belt front sprocket on them and these would wear and cause a leak from the transmission. It will leak a spot of oil about the size of a quarter or so when you park it. It will not leak anymore until you either crank the bike up or ride it. Sometimes you can smell of the oil and tell where it came from. I need more information.


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Ok, this is a lot better. I used to tell people that I couldn't fix a motorcycle over the phone and here I am trying to do it on a computer. My how times have changed.

Now, the seal that you're talking about is the engine sprocket shaft seal. I may not have been in backwards since I don't know what way it was in the case. If you look at a seal, the lip is pointed in one direction. The seal should be installed with the lip pointed AGAINST the oil flow, in this case towards the inside of the engine.

Another thing that most people make a mistake one when installing a new seal is that they put it up dry. By dry, I mean that they do not lubricate the lip of the seal, not the outside diameter. The reason, when the engine starts up, it goes to 1000-1500 RPM almost instantly. The result is friction burns the lip of the new seal up before oil has a chance to get to it.

Next, the spacer that goes onto the sprocket shaft should have had a larger diameter on one end of it. This larger diameter goes on the backside of the seal against the bearing in the case. This helps keep the oil away from the seal. Also, it helps to put a bead of RTV around the sprocket shaft where it comes out of the spacer. This prevents oil that might run down between the shaft and the seal from leaking out.

This is the best that I can tell you without actually seeing your setup. Someone may have changed the spacer with one that came with the belt drive kit and it's allowing the oil to leak. If you would like an "exploded" view of how your bottom end is assembled, send me an e-mail at wd4ity @ I'll scan the picture in a service manual and send it to you.

Good Luck
Steve Bentley

Posted on Apr 27, 2010

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