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Old 6th July 2019
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Default Oil cap problems - Bikers Choice 02-073

Wondering if I should dig deeper, or if this oil cap is just a pos.

https://www.ebay.com/itm/311385473079

Bike has lots of miles and wet-sumping problems "sometimes" which I haven't fully diagnosed. Read all the gobs of info on sportsterpedia (Thanks to the contributors that's an awesome resource!) and I know how to diagnose it, just confused by this little anomaly that's come up.

I got the oil cap because I wanted knurly grips on it because lately my oil cap is practically impossible to unscrew. Added bonus is the temp gauge.

Problem is the end of the stick on this cap isn't sealed - it is like a straw. Inside is a shaft attached to the temp gauge with just an oring around it under the spring. So apparently pressure will push the oring up and oil come out around it through the "straw" which then ends up all over the side of the bike. I drained some oil and ran the level as low as I dared, same problem.

So I ordered new umbrella valves, and tomorrow will check the vent-to-cam-chest line for obstruction.

Question is has anyone tried this oil cap? Any better suggestions? The stock one was OK and looks fine except I can't turn it. The new one is only slightly easier and I'm wondering if I need a new oil tank that maybe mine is warped?
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Last edited by dieselvette; 6th July 2019 at 03:04..
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Old 6th July 2019
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XLF member JohnK found that the internal sleeve in the OEM caps are weak and apparently easy to break.
That ended with the cap popping up out of the blue though.
That article is here:
http://sportsterpedia.com/doku.php/techtalk:evoil04b

And there is a certain way it has to be installed:
http://sportsterpedia.com/doku.php/t...oil04#oil_cap1

But the cap is apparently difficult to turn.
Maybe the plastic threads warping?

Would love to add some pics of your new cap to the pedia if you get a chance to snap a few.
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Old 6th July 2019
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Three of the four reviews on that Ebay page say the cap leaks.
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Quote:
Originally Posted by Bored now View Post
Three of the four reviews on that Ebay page say the cap leaks.
I know, didn't see that until later On the other hand, people are idiots and it's plausible their bikes have a venting problem too.

I'm going to hang onto it until I've solved my venting/tank spout problem and see if it still leaks. Then even if it works good I'm still not going to run it because it's a liability.
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I would like to see how you address the wetsumping issue.
When you pull the breathers, if you could pull out the mesh and expose the inside, I need see a pic of surface behind the mesh.
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if i am reading this right, oil is pushed up through the center of the dip stick and not the threaded cap portion??
a pic of the cap and drawn in leak path would help
perhaps the original cap can have a rubber ring installed for better grip, sorta like a garden hose nozzle.
as a side note, make sure the equalizing line between tank and cam chest is not restricted or the tank can build pressure.
did not hd get rid of the mesh.
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After draining the oil and further inspection, there will be a lot more to this story than I thought. But first I'll stick with the oil cap issue. Hippy is looking for detailed info about the aftermarket BC cap, so here ya go. You can see the temp probe sticks out, and goes through the hole down the middle:

IMG_20190706_1226047.jpg

The hole is open through to the bottom, like a straw. The o-ring has a landing inside the straw, it fits OK but I can see how it wouldn't hold much pressure. The pop-up design and all is basically the same as OEM, except the coil spring is a little heavier.

IMG_20190706_1222487.jpg
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Here is my theory about the original cap

I think it's binding because it's a tight fit inside the oil tank, and the spout is not aligned well with the chrome bezel in the side cover. After removing the side cover the oil cap works a lot better, although still not as easy as it should be. (It also helps that you can get a hand around it without the side cover in the way.)

If you look closely at the pic, you can see scratch marks that follow the angle of the slot of the cap
IMG_20190706_1229590.jpg
IMG_20190706_1230110.jpg

Inside the spout, if there's anything to see here?
IMG_20190706_1234068.jpg

Normally this is all squeaky clean, and I'm anal about the oil cap being clean when re-installing. But the scratches could be from foreign material in the oil? Could be over-thinking it. More on that later.

Not really interested in spending $200 on a new oil tank if I don't have to. Maybe the side cover will get "modified" instead.

Hippy - I won't have parts for the top end until next week, so I'll post pics of that later. For now it looks like I'll be cleaning out the vent hose tonight, and pulling the oil pump to get a close look at that.
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on the aftermarket stick, the white piece stays in the tank and the probe and black piece comes out. if so the oring and backup washer is not expanding enough to seal.
now for the original cap, i have run across sticky oil caps on autos and the #1 issue is the oring itself. after awhile, they are not as pliable and have a tendency to grip. what you can try is a silicon oring or even teflon. another thing to try is a quad-ring.
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Old 7th July 2019
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Quote:
Originally Posted by bustert View Post
on the aftermarket stick, the white piece stays in the tank and the probe and black piece comes out. if so the oring and backup washer is not expanding enough to seal.
now for the original cap, i have run across sticky oil caps on autos and the #1 issue is the oring itself. after awhile, they are not as pliable and have a tendency to grip. what you can try is a silicon oring or even teflon. another thing to try is a quad-ring.
That's a great point. Will put a new oring on the original cap.

The aftermarket one, if I was going to keep it i'd try a different oring or something on the shaft. But I may be content just getting my $50 back.
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