| Author | Message | ||
     Gunut75 |
A fellow Bueller has primary oil leaking into the crankcase. What failed? What is needed to fix it? Thanks in advance. | ||
| Firebolt020283 |
sounds like the crankshaft seal. You will have to remove the primary chain and the sprocket on the crank shaft to get to it. I hear it is not a hard job but I don't know for a fact. | ||
| Hughlysses |
If the crankshaft seal is bad, I think it's much more common for the oil to go the other way- from the crankcase into the primary, since the crankshaft bearings are pressure lubed. How does he know that's what's happening? There's only a quart of primary oil to start with. Is his engine oil level going up? The only thing I'm aware of that could cause it is a blocked transmission vent. | ||
| Firemanjim |
Hugh is correct---engine oil is under pressure and a bad seal will result in the engine oil pumping into the trans. Trans oil not under pressure. Why does he think it is doing this? | ||
| Gunut75 |
Yes, the engine oil level is going up. It is filling the swingarm. | ||
| Migs16 |
hey iam, I did another oil change drained everything i can. and refilled back to specs. i got to ride it today and then checked my levels and everything was fine. but im going to give it a few more rides and test once the weather gets better. Thanks for the help. | ||
| Hughlysses |
Thinking about it, there's almost no way you could get enough oil to go from the primary into the engine to cause a detectable increase in the level. The normal oil level in the primary is ~1/2" below the bottom of the crankshaft seal. Is it possible you overfilled the engine oil? If the bike sits up a long time, the oil can drain from the swingarm back through the scavenging section of the oil pump into the engine cases. If you check the oil level without running the engine first, you'd find it really low. If you add oil to bring it up to level and then run the engine, the next time you check it it'd be really high. Hopefully your bike is fine and you just goofed when changing the oil or checking the oil level. | ||
| Gunut75 |
Keep an eye on it Andrew. Ride safe. Cheers: all that good stuff... | ||
| Tiltcylinder |
The oil level in the primary would need to be pretty high to allow a significant amount of oil to get into the engine. On the upstroke, the breather should be 'closed', creating a partial vacuum in the crankcase (or at least a lower pressure than atmospheric) and then it opens on the downstroke, to allow pressure created by the pistons travelling downward, to escape. Otherwise v-twins leak at every seam and joint. IF the seal is bad the thing could suck oil in from the primary, but there would have to be a lot of oil present.... Drain the engine oil, refill with the correct amount and check the level in the primary. If the primary level doesn't change... | ||
| Migs16 |
i think hugh hit it on the head. my bike was cold when i changed the oil and thats were i goofed. i should have let it warm up. because when i did put a quart i couldnt even see it at the bottom thats why i put 2. right now i only have one quart in there after having to drain it all. thanks everyone for the info. i honestly learn new things about these bike every day. | ||
| Argentcorvid |
This is a common problem with older Sportsters too. If you change the oil after the bike has been sitting for too long, the oil drains into the crankcase, and you can't get it out of there without the oil pump running. After you fill up with new oil, there's too much in there causing the oil tank to pressurize, which makes the non-threaded filler cap pop out, and oil goes everywhere. | ||
| Nobuell |
I only check the oil in my 08XT while the engine is running. The oil level will drop quit fast upon shut down. I once overfilled be fore I realized the need to idle. Made a mess of the airbox. |
