Question about 2000 Harley Davidson FXDWG Dyna Wide Glide

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Oil leak at inner primary

Already replaced gasket,seals-inner primary,5th gear,new bearing.

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  • pup usmvmc Mar 11, 2009

    Check tha shifter linkage seal it is a small on and can leak like the fifth gear seal.

  • Roberta Smith
    Roberta Smith May 11, 2010

    looking over one of the service manuals i have... is there a specific area that the oil is leaking ...



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06 Road king inner primary leak where shift lever comes out, seal was leaking...Under warranty fixed no charge, no further issues!

I have heard of this same leak on the V-twin Harleys due to normal motor vibration "unbalanced" which is normal on the older models the 2008's and newer baggers have a differant mounting system that eliminates the vibration/ jumping/ loping/ which again is a normal Harley engine

Posted on Mar 24, 2010

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Most inner primary leaks come from the alternator o-ring the best thing to do is put on a new one and put clear silicone on the primary and the engine case.

Posted on Mar 03, 2010

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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...

1 Answer

Thanks wd4ity, your instructions helped. I checked everything. But after changing 4 seals of different makes, its still leaking after a quick run round the block. The leak is not as bad but get a small...

Ok, usually when I give information on things like that, I tell them everything that I know so that they get their problem fixed the first time. I don't allot it out piece at a time. So, undoubtedly, there is something amiss here, not just the normal leaky seal.

If you are positive that the leak in coming from the backside of the inner primary at the mainshaft. There is a starter seal up just a bit higher that can leak as well. You should have already checked the inner bearing race position on the mainshaft, 0.100" from the face of the final drive gear and that the race is between 0.9950" and 1.000" (25.27-25.40mm) long. The race is free of burrs and deep scratches. The new seal should have a tension of about 0.5mm (0.020") between the seal and the bearing race. If you measure the inside of the seal with a caliper and then measure the outside of the race, the race should be a bit larger than the seal.

When you installed the seal, did you inspect the recess where the seal goes in to make sure there are no cracks? Did you use the sealer on the outer edge of the seal ( I like non-hardening Permatex) and lubricate the seal where the bearing race runs with Lubriplate or oil. When you install the seal, make sure the lip of the seal where the bearing race runs is pointed INWARDS towards the clutch, not the trransmission. The "Lip" of the seal always faces against the direction of oil flow and is seated about 0.050" below the surface of the backside of the primary. The seal must be straight as well. If you get it in crooked in won't seal. If you can't get an OEM seal, try to order a James Gaskets seal.

Double sealing does no good as no oil gets to the outer seal and it burns up very quickly even if you pack grease between the seals. This used to be used on the old Shovelhead with the sealed bearing. It does keep dirt away from the seal though.

Now, it still sounds to me like it's your quad seal behind the front drive pulle. The quad seal keeps the transmission lubricant from running underneath the spacer behind the front pulley and then down between the front pulley splines and the final drive gear. When it drips off, it will drip onto the mainshaft and run down the backside of the inner primary.

Next time you have the inner primary off, take the lock plate off the front pulley and check the large nut. If it's loose, this could be your problem. Usually the nut is loose enough to turn it by hand. It has left handed threads in the nut. The front pulley is made of cast iron and is softer than the final drive gear. This is by design so that the relatively simple and cheap to replace front pulley wears instead of the expensive final drive gear. Without taking the final drive belt off, you probably won't feel any movement in the front pulley.

Well, I hope this helps again. For the life of me, that's all I can thnk about. I've even included some information that I never check in most cases, like the length of the inner race.

Good Luck and Ride Safe

Jan 18, 2011 | 2004 Harley Davidson FXSTD - FXSTDI...

1 Answer

I have a 2004 Duece FXSTD. Drops of oil was found on the floor under clutch area of the primary. After some inspection, I found that it was streaming from the inner primary.Got a seal set from Motor...

Did you check your front belt pulley? These pulleys are made of relatively soft cast iron as compared to the final drive gear. This is so that the easily replaced and relatively inexpensive front pulley wears before the difficult to replace and expensive final drive gear wears. The pulley will wear in the splined inner bore and will get loose on the final drive gear. Then transmission oil will run out of the pulley and down the inner primary. This is because of the lose of pressure on the "Quad" ring behind the pulley spacer. This may be your problem.

Another mistake a LOT of people make when replacing any seal is putting the seal up dry. On the inner primary seal, you want to put a bit sealer compound around the outer edge of the seal where it goes into the case. Although there are a lot new sealants out there, I still prefer good Permatex non-hardening. Once you get the seal in and straight, oil the inner seal surfaces and the bearing race. If you put the seal up dry, you start the engine, the mainshaft turns about 1000 rpm. This will burn up the delicate rubber lips on the seal almost instantly because of friction before the oil can get to the seal. You MUST lubricate the seal or it WILL burn up before you can blink an eye.

Also check the position of the inner primary bearing race. It must be 0.100" from the final drive gear. If it's way out of position, the seal may not be riding properly on it.

If you are in doubt about whether the transmission is leaking or the primary, refill the primary with a quart of automatic transmission fluid, the red stuff. It will work long enough for you to determine whether it's the transmission leaking or the primary leaking. If it's the transmission, check the front belt drive pulley for wear, You'll usually find that the large nut that holds it on is loose.

Good Luck

Dec 27, 2010 | 2004 Harley Davidson FXSTD - FXSTDI...

2 Answers

I have a 2004 Duece FXSTD. Drops of oil was found on the floor under clutch area of the primary. After some inspection, I found that it was streaming from the inner primary. Got a seal set from Motor...

Harleys are notorious for this, better today, but still leakers, the machined surfaces of most production castings are not flat, square, blueprinted, etc I recently built a 400 Chevy small block
the block was align bored , paralell decked, and the heads were machined aftermaket i Dart iron heads, all perfectly machined, I got the Edelbrock cam , lifters, carb and intake manifold a Performer package all from Edelbrock matched to work together.
I got the intake installed torqued and using Fel Pro gaskets filled the engine to check for any tiny leaks etc, when a river of green flooded the intake and poured off the end of the engine! WTH??? HOW?? WHERE?? WHY??Luckily I had My builder with me and He got out the micrometer etc and said this stuffs garbage!! we went to Kragen and checked every one they had, alll as abad or worse than mine! we went to 3 storse to only keep my original intake yet it required macjining and port matching to fit right and not leak as it was production not

Dec 27, 2010 | 2004 Harley Davidson FXSTD - FXSTDI...

1 Answer

Oil leak -between inner primary and transmission . Changed broken belt and now I have this leak. I put new mainshaft seal and jackshaft seal. Help!!!

There are several seals that can leak in this area. You say you replaced the mainshaft seal in the back of the primary. I've seen a lot of people replace this seal only to have it start leaking immediately. The reason was that they didn't know you must lubricate the seal before you reinstall the primary cover. When you put the primary cover on with the seal dry, when the engine starts up, the mainshaft immediately goes to 1000 RPM or higher with no lubrication on the seal. The friction burns the lip of the seal up before the lubrication in the primary can get there. It only take a second, literally.

Other seals that can cause leaks in this area are the large final drive gear seal in the face of the transmission behind the front belt pulley and the "Quad" seal that is inside the transmission. The Quad seal is almost like an O-ring. It's purpose is to prevent transmission lubricant from seeping out through the splines of the final drive gear. If the front sprocket splines wear and the sprocket gets the slightest bit loose, the compression on the Quad seal will be lost and the tranny will leak. The tale tell sign on this leak is that the transmission will leak a spot of oil about the size of a quarter or a bit bigger when you park the bike. If you wipe up the spot, it won't leak anymore until you either ride the bike or simply start the engine. Then it'll leak that quarter sized spot and stop. Check your lube level in your transmission.

Whenever I pull the inner primary and the belt on a Big Twin, I replace ALL the seals. Make sure you lubricate the lips on the seals so they don't cook before lubrication can get to the seal.

Good Luck

Jul 13, 2010 | 2000 Harley Davidson FLHR-FLHRI Road king

1 Answer

Oil leaking from the back of primary case

There are several things behind the inner primary case that could be leaking. There is a seal behind the inner primary where the transmission mainshaft goes into the primary. This seal sometimes starts to leak. Also, there are seals in the transmission in that area. The final drive gear seal is the big seal right behind the front final drive belt pulley. Somethimes this pulley wears on the splines of the final drive gear and it loses tension on the "quad seal" on the final drive gearshaft.

You'll nee some special tools to get to this area. You'll need sockets to fit the compensator sprocket nut and the clucth nut. You'll need an airwrench, a primary locking bar, and a torque wrench that will pull 150-165 ft. lbs. torque in forward direction, 68-80 ft. lbs. LEFT-HANDED on the clutch nut, a primary locking bar, a final drive sprocket locking device, a mainshaft nut removal tool, and some seal pullers and installers. Good Luck.

Apr 22, 2010 | 2004 Harley Davidson FLTRI Road Glide

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...

1 Answer

Have devolped a small leak on 2005 road king. drips from bottom of primary cover at drain bolt. running down from above. back of primary cover has slight oil dampness around transmission and starter shaft...

Spray it off at the car wash to remove all the oil , then spray Right Guard (Yes, that Right Guard) on the area of the leak. It will show up, but you may not be able to see exactly where. There are a couple spots where it can leak. The jackshaft oil seal, as you said, transmission output shaft (clutch shaft) on the trans itself, the inner primary seal where the trans shaft runs thru, the engine sprocket shaft oil seal, inner primary O-ring, the bolts that hold the inner primary to the engine/trans, the primary chaincase gasket and the drain plug. Hopefully when you get it apart, you will see which seal is leaking. If not, replace them all. Still want to fix the leak? LOL

Jun 30, 2009 | 2005 Harley Davidson FLHR - FLHRI Road...

3 Answers

Leaking both oil and a mixture of oil and water

well when you have water and oil both leaking it most of the time means a head gasket or in your case a jug gasket

May 25, 2009 | 2004 Yamaha YZ 250

2 Answers

Have a serious oil leak.

the 3.0 liter engine was known to walk out cam shaft seals. there are covers over the camshaft gears that can be removed and you should be able to see if the seal has came out

Jan 31, 2009 | 2000 Dodge Caravan

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