oil leaking from filler cap
Thread Starter
Senior Member
SuperSport
Joined: Nov 2011
Posts: 700
oil leaking from filler cap
I changed my oil two days ago and noticed a fair amount of oil leaking from the filler cap after riding. The o ring is in great shape and seated, cap obviously tight. What I did notice when I changed the oil and filter was that it took about 4.7 quarts to get a proper reading in the sight glass, when the manual calls for 4.1 quarts. Would half a quart cause it to over flow from the cap?
Thread Starter
Senior Member
SuperSport
Joined: Nov 2011
Posts: 700
It didn't leak before
What I did was drain, change filter, refill with 4 quarts, started and let warm up. level was right below lower mark, so I put in a little more, waiting 5 minutes, and checked again. I did that a few times until I got it right below the top line, but maybe I didn't give it enough time to settle.
4.1 is max for a change, I always tilt it onto the side stand to drain as much as possible so I figured I may have for a little extra out. Seems like I put too much in, its just weird it would leak from the cap.
What I did was drain, change filter, refill with 4 quarts, started and let warm up. level was right below lower mark, so I put in a little more, waiting 5 minutes, and checked again. I did that a few times until I got it right below the top line, but maybe I didn't give it enough time to settle.
4.1 is max for a change, I always tilt it onto the side stand to drain as much as possible so I figured I may have for a little extra out. Seems like I put too much in, its just weird it would leak from the cap.
Retired- but not tired!
SuperBike
Joined: Aug 2010
Posts: 1,481
From: Pittsburgh
So is this overpressurizing the crankcase from the increased oil volume? (downward motion of pistons increasing crankcase pressure)
I am thinking the filler is at the top of the case so there must be a significant atmospheric pressure increase to blow oil past the o-ring. (since liquids don't compress)
I am thinking the filler is at the top of the case so there must be a significant atmospheric pressure increase to blow oil past the o-ring. (since liquids don't compress)
über-n00b
Superstock
Joined: Dec 2011
Posts: 257
From: S. WI
I have weeping at the filler cap, also. after each session at the track, I had to wipe a tiny amount off the cover.
I'll buy a new filler cap & o-ring.
I heard someone suggest to wrap the threads with Teflon tape....?
I'll buy a new filler cap & o-ring.
I heard someone suggest to wrap the threads with Teflon tape....?
Senior Member
MotoGP
Joined: Jul 2007
Posts: 5,066
From: NYC
Did you check the oil with the bike on the sidestand? Thats what it sounds like. You check it with the bike plumb (balanced up & down). There should no way be pressure on the filler plug, and oil doesnt need time to "settle" unless its -25F.
Thread Starter
Senior Member
SuperSport
Joined: Nov 2011
Posts: 700
Nope, I know what I'm doing. I double checked the level again and its still between the lines, but I'm still getting a small drop after 30 minutes. O ring shows no cuts or flaws and is not dried out or loose.
Wouldn't excess oil be expelled via the crank case breathers?
Wouldn't excess oil be expelled via the crank case breathers?
SportTouring
Superstock
Joined: Aug 2006
Posts: 274
From: Hawaii
I use a small bubble level on the gas tank cover to be sure it is level when I check
my oil level. It does take some time for it to settle(oil). I have about 67k on my bike
and I have never had it leak from the filler cap. Maybe a drop or so. 4.7qts. seems a
bit much. Though I am using the factory oil filter on mine. If you are using a larger
capacity oil fitler it could use more to fill.
my oil level. It does take some time for it to settle(oil). I have about 67k on my bike
and I have never had it leak from the filler cap. Maybe a drop or so. 4.7qts. seems a
bit much. Though I am using the factory oil filter on mine. If you are using a larger
capacity oil fitler it could use more to fill.
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