It appears that I’m losing engine oil into my primary. After a few 100 miles of riding, my oil level drops and the primary is overfilled. No change in tranny fluid level.


Last year, when I replaced all the primary seals, I also changed the crank shaft bearing seal, along with the sprocket shaft spacer. Attached is a pic of how I installed spacer and seal. For seal, I installed spring side toward crank. For spacer, I installed the larger lip end, closest to crank.
Upon removal, the seal still looks new. The spacer has no nicks or grooves, but slight black line, where seal rubs against it.


Is this the correct direction for both? The service manual is not great at pointing this out, but the crankcase diagram does indicate that I installed the space correctly. For seal, is it spring in, or spring out?


The bike has 70K on it, and had some work done around 50K (mother-in-law tossed out paperwork).


I don’t have a tool to measure the crankshaft runout to see if I have larger issue. I did gently use a small pick to spin the outer sprocket shaft bearing. With some mild effort it does spin around shaft. Is this normal, or does this indicate my crankshaft bearings are shot? Should this bearing be so tight, that I should not be able to spin it?


What am I overlooking?


One last question about crankcase runout tools. Anyone have a recommendation? I found the following, specific to Harley (https://ibm.biz/Bd42aC) for $100, or a generic gauge (https://ibm.biz/Bd42aQ) for $30.


NOTE: As you might see from the pic, I used silicon on the stator mounting holes and stator wire clip holes. I also can’t see any cracks in the case.

 

Spacer lip goes towards the crank but your seal is backwards, it should seal the primary fluid from getting into the engine. Those cases are more towards a dry sump system and shouldn't have that much oil in the case to cross to the primary unless it is sumping or restricted returning to the tank.

Need to put the seal in correct to start, make sure you don't drive it in too far, believe there is a oil drain hole between the bearing and seal that keeps oil from building up behind the bearing.

 

Why is your seal in front of your spacer? The direction is correct.

 

S&S pic attached, lip is out and seal in with back facing out opposite of OP's pic. I hope I'm right, was always told and read to seal the primary from the engine and reverse the seal with a belt drive lip in.

 

Looks like mine, also an S&S.

 

Replaced the seal on the Lowrider, couple yrs ago, & put the new one in just like the old one, spring out, like has been said.


Ride Safe,
Harold

 

Some older Evo's develop a leak between the steel insert that the bearings and seal are in, and the case.

Wet primary-seal lip out
Dry primary-seal lip in.