| Author | Message | ||
     Scrion |
I have a '98 S3T - original owner, about 25k miles. Recently, my oil tank gets pressurized after riding for any length of time. It has blown the oil tank plug out - thankfully the seat kept it from falling off, but it still blew oil all over the tank, etc. Any thoughts on what could cause the oil tank to get pressurized? | ||
| Ocbueller |
9 out of 10 is that your oil tank is overfilled. These bikes only take about 2 qts. Drain and refill. SteveH | ||
| Hogie |
Hey Scrion, was that the case, too much oil? i have the same problem but my oil pressure switch also keeps failing. In addition, after a cold start within 20 seconds pressure builds no indicator light appears on the panel and the rubber plug where you fill the oil tank up is raised / pushed out 1/4 way and the oil has tiny air bubbles in it. However, if i drain the tank from the drain hose the oil does not appear to have air present and the temp of the oil is cold. Ive blown the vent hose, checked the umbrella valves and changed the oil twice only using 2 quarts. | ||
| Bremobiker |
I've been dealing with oil leak issues thinking it was crank seal, and blowing out of primary vent. Turns out it's an oil tank leak somewhere. Buell tech took a look and mentioned that the tanks can get pressurized up to 10-12 psi when getting the revs up. I have a screw on cap, so not experiencing same issues, but thought you may want to know what I learned. | ||
| Bremobiker |
FYI, my bike is a 99' S3 | ||
| Hootowl |
On a tuber, oil should be no higher than half way between the marks on a hot engine immediately after being shut off. | ||
| Coconut_lightning |
I have the same problem. I recently cleaned and checked all my houses. Checked the frame for any leaks. Before this I noticed a lot of bubbles in my oil after riding for any length of time. Anyways. Cleaned all of them and put the bike together again. The oil registered at the first dot on the dipstick cold. Noticed some oil on my jug but figured it was dripping out from my breather valve which has had a little leak to it. It was difficult to start and would only start if it was upright. 15 min down the road I hear a click. So I pull over. Nothing seemed loose so I figured I'd check the oil. When I go to check it oil starts blowing out if the top. About a 1/4 to 1/2 a quart. I accidentally overpoured the oil when I first got the bike. Only idled it but I think it blew my valve seals. Now I'm wondering if I didnt weaken the head gaskets as well and it's just now showing it face. Any thoughts or experience? | ||
| Akbuell |
Bubbles in the oil tank are normal. The engine has a dry sump system, meaning the tank is higher than the crankshaft, with the oil stored in the tank. The 'return' side of the oil pump has a greater capacity then the 'feed' side, so oil can't/won't build up in the crankcase. Which means the return side also pumps air, leading to the bubbles. As has been mentioned, overfilling will cause the situation you experienced. A side effect CAN result in excess oil coming out of the crankcase breather and soaking the air filter causing running and starting issues. Oil on the jug is usually (on our bikes) a result of a rocker box leak. Clean carefully and then check. Bad valve seals will allow oil into the combustion chamber, causing white smoke to come out of the exhaust. Best solution - start the bike and let it run for a few minutes. Wouldn't hurt to have the oil cap loose. Drain the oil, and refill with the measured correct amount per the owners or service manual. Hope this helps, Dave | ||
| Coconut_lightning |
Yes it does! When I cleaned up my bike I ended up crossing the oil feed and oil out lines. Big duh... got it routed right and oil barely registered on the dipstick. Got about 15 min down the road and it smelled bad. Looked at it and it had some oil around the valves and stuff and for such a short drive in 50 degree weather it got hot fast. Also it has like a weird clicking sound. I think the valve steps seals and the valve gaskets need to be replaced and from looking at it it seems that means the gaskets on the jug will need replaced too. How hard is it to do yourself? I'm pretty mechanically inclined. Also I work on 4cycle lawnmowers which are similar but not exactly the same. |
