Question about 2005 Harley Davidson FLSTC - FLSTCI Heritage Softail Classic

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1995 softail. crancase leaking only when running. cannot see where it is leaking from. seems to be leaking backside by the frame.

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It sounds like a inner primary seal infamous for leaking only when your riding or when the bike is nice and warmed up And yes it will blow back towards the rear frame and gets all over the belt too . Unless you really know what your doing then have a pro fix it . The first couple times I did it myself I didn't install it properly because it's real easy to pinch the seal when your installing it . I finally bought it to a dealer and paid thru the nose for labor . Even the mechanic said its a real tricky install . If you don't get it just right then you'll be doing it again. At least w the dealer ,if they mess it up they will redo it at no charge good luck ,

Posted on Oct 24, 2014

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O/k I will assume it is a EVO (1995) not a Twin Cam (2005). If the leak is at the crankcase lower rear (below barrell) it is more than likely the crankcase itself is leaking. Will need a teardown to repair. It could also be the rear cylinder base gasket leaking. Oil will flow down the back of the crankcase when running.

Posted on Jan 01, 2014


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Posted on Jan 02, 2017

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SOURCE: is it a concern an oil leak from the base rear cylinder 1995 heritage softail

You can ride it, but the leaking oil could cause problems if it gets on the rear tire, brakes, etc. You may as well replace both base gaskets at the same time.

Posted on Mar 06, 2013

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Oil leaking from crank case

Hi Anonymous, I would take it over to your local dealer or reputable shop and let them evaluate the leak. Good luck

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On the Softail, the engine oil drain hose comes off the backside of the horseshoe oil tank down at the bottom on the right side of the bike. It runs down behind the transmission and comes back out on the top side of the frame down below the chrome end cap of the transmission on the right side. On earlier models, there is a metal plug that plugs the hose and on later models, the hose plugs onto a crossmember of the frame. The drain plug is on the underside of the crossmember. The drain is low on the frame behind the exhaust pipes.

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Where is oil drain plug on 2003 heritage softail classic,found allen screw on bottom right side. Is this it?

If it's on the underside of a frame crossmember with a large hose connected to the upper side of the crossmember back around the transmission, yes. If it's underneath the engine, no. The oil drain hose comes from the lower right side of the oil tank on the backside and runs down behind the transmission and back out ot the crossmember. It's behind the exhaust pipes as well.

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Sep 07, 2011 | Harley Davidson FLSTC - FLSTCI Heritage...

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I have leak from what seems to be from behind the primary case.

sometimes the mainshaft leaks.. ****** ..or I have seen where shifter exits the ****** behind the primary that seal leaks ,, look under & from above ..anyway youll pull the fix good luck..check out our info at

Aug 16, 2011 | 2000 Harley Davidson FLSTC Heritage...

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On all Softails, the oil drain hose comes off the lower backside of the oil tank on the right side. It goes down behind the transmission and back out just above the lower frame tubes and the lower part of the swingarm. Depending on the year model, the hose either dead ends right there below the transmission and behind the exhaust pipes with a plug in it or it connect to a nipple on the frame at a frame crossmember that runs across the frame under the transmission. If it connects to the frame, the drain plug is directly underneath this connection on the bottom side of the crossmember.

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I need to see a video of oil being changed on a 2005 softail deluxe

I doubt you're going to find a video of the oil being changed on a Softail. To change the oil on your Softail, look at the oil tank from the right side of the bike. At the lowest point on the backside of the tank, you'll see a large hose coming from the tank and running down behind the transmission. The hose comes back out from behind everything at the lower part of the frame behind the exhaust pipe and looks like it connects to a crossmember of the frame at the bottom. Feel underneath the crossmember directly underneath the hose and you'll feel a drain plug. Remove the plug and the oil drains out of the tank.

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May 06, 2011 | 2005 Harley Davidson FLSTN- FLSTNI Softail...

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I have a 2009 heritage softail classic and cannot locate the drain plugs for the oil and transmission. Is there any printed drawings of these locations? Thank you Jim Ragazzo

For your oil drain, look at the oil tank from the right side of the bike. On the backside down at the bottom is where the hose comes out. It runs down behind the transmission and comes out just below the chrome end plate on the transmission. Follow it on down and you'll see that it connects to the crossmember of the frame that runs under the transmission. Directly underneath this connection, under the crossmember there is a drain plug. Remove the plug and the oil will drain.

To drain the transmission, look at the chrome end plate on the transmission that the clutch cable runs into. This is the clutch release mechanism. Just below this, in the center the plate the chrome one bolts to, is a drain plug similar to a pipe plug. Remove the plug, transmission drains. Refill the transmission with 20-24 ounces of transmission lube.

Good Luck

Apr 27, 2011 | 2000 Harley Davidson FLSTC Heritage...

1 Answer

Wear is the drain plug on 1999 flsts

its either on the crancase base ,base of oil tank on sum you remove oil pipe from tant to drain

Jul 03, 2010 | 2000 Harley Davidson FLSTS Heritage...

1 Answer

Severe transmission oil leak on a 04 softail. Leaked out on left side

Two places could be leaking. Primary cover leak on either side. Outside gaskets are not very difficult to replace. There is a oil seal on the backside that requires the removal of the inner primary. This is a difficult job for the amateur hobbist mechanic but it can be done. You'll need a lot of tool including a torque wrench that will torque a left hand threaded nut and one that will torque to 150 foot pounds. You'll also need a primary locking bar.

So, as you can see, if it's anything other than an outer primary cover, inspection cover, or derby cover leak, it's probably best to take it to a shop. If you do this, have them pull and inspect the front belt drive pulley while they're in there. Also, replace the transmission main shaft seal (small one) the final drive gear seal (the big one) and the "quad seal" behind the spacer for the pulley (like an o-ring). And replace the oil seal on the backside of the inner primary cover. Good Luck

Sep 17, 2009 | 2004 Harley Davidson FLSTC - FLSTCI...

2 Answers

Cant locate power steering leak

your seal is probably gone.

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