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Post by trailheadmike on Aug 29, 2015 14:58:56 GMT -5
Last time I changed my oil it appeared to me that there was less than usual in the dump tub. I changed the oil today, 1,550 miles later, and of the 1.4 liters that the engine takes, I don't think there was a shot glass worth of waste oil. My first thought was oh no, I've seized the engine, but its been running great and is running great after the oil change too. I have no oil leaks, and my exhaust is clear, so although I assume I'm burning all the oil, I don't see it. Anyway, I'm guessing I damaged the rings somewhere along the way?? I'm open to opinions. If I damaged the engine, other than burning oil I'm not seeing it in operation.
One moral of the story is to remember to keep checking your oil between changes. I used to but I got lazy because I never needed any extra - until now!!!
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Post by tvnacman on Aug 29, 2015 15:56:48 GMT -5
check by the air filter where the crankcase vent goes. If it is after the filter the its getting burned with intake air.
John
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Post by hillbillybob on Aug 29, 2015 19:38:15 GMT -5
Something doesn't sound right. An engine that is supposed to have 47 ounces of oil in it, is running fine with only one ounce......are you sure your drain is not plugged with something, and not letting it drain completely.....did it take the full 1.4 liters to refil to the top mark on the dipstick?
With only an ounce of oil in the crankcase, not a single part of your engine was receiving an lubrication......I don't see how it would have run more than a few minutes under those circumstances.
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Sophomore Rider
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Post by trailheadmike on Aug 29, 2015 20:56:22 GMT -5
hillbillybob - I completely agree with you so I am at a loss. I put the full 1.4 liters in and it was not overflowing. From what I understand you only need a very short time to seize up but I just took it out for another spin and have plenty of power and speed. I'm going to start checking the oil weekly and I'll see how it goes. tvnacman - John - The way this scoot works is that the air filter is far away from the carb and connected by about 2 feet of rigid tube so nothing is burning up there.
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Post by JerryScript on Aug 29, 2015 22:10:45 GMT -5
What is your crankcase vent tube attached to? It's normally attached to the air filter. Most scooters with a uni type filter re-route the vent tube, here we recommend attaching a fuel filter to the end of the tube and zip tying it high on the frame.
If tracing the vent tube doesn't solve the mystery, and there is no leakage, check the plug for fouling, a black build up indicating ring problems.
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Sophomore Rider
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Commuting is the best part of my day!
Posts: 213
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Joined: Feb 26, 2013 7:56:23 GMT -5
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Post by trailheadmike on Aug 29, 2015 22:28:08 GMT -5
JerryScript - this is a Linhai clone, and here are the expanded drawings. roketa.com/product/product_support.jsp?cateID=2610&sonCateID=0&proID=33907The airbox is drawing F9, and you see there is nothing connected to the air filter. The vent, as I understand it, is shown in drawing "Engine Assembly (04)" and is the unnumbered part just to the left of the rear axle numbered 29-12. I changed the plug very recently because of a damaged end and broken boot. It looked just as it should. Very, very strange.
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Post by JerryScript on Aug 29, 2015 23:18:12 GMT -5
I haven't worked on those, so hopefully someone who has will chime in.
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Post by rockynv on Aug 29, 2015 23:38:06 GMT -5
When was the last valve adjustment? As the valves tighten they close early and will cause oil to blow out the vent and past the rings.
1,550 miles is pushing it on an engine without a full flow oil filter.
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Post by tvnacman on Aug 30, 2015 7:15:41 GMT -5
It will not get burned in the intake tube. If you have blow by/hi crankcase pressure ( could be from leaky valve seals or rings) the extra pressure vents in the air cleaner or intake tube. There would be fine mist of oil if the crank case pressure is high.. I can not give you a measurement its kinda a feel when checked.
John
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Sophomore Rider
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Post by trailheadmike on Aug 30, 2015 10:59:51 GMT -5
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Post by rockynv on Aug 30, 2015 13:23:54 GMT -5
If its blowing out the vent then I would still be inclined to verify the valve adjustment before going too far chasing other problems.
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Post by tvnacman on Aug 30, 2015 16:18:38 GMT -5
well if the oil you searched for and found bothers you . I would get a catch can to catch it.
John
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Post by rockynv on Aug 30, 2015 21:44:04 GMT -5
Mike,
That is the Yamaha 260 based on the Euro Yamaha Majesty and it suddenly started dumping oil so a catch can while it will keep it cleaner still does not resolve what happened so rapidly. The oil dripping along the carb purge line could indicate a leaking gasket or could also be a symptom of pressure in the crankcase or perish a crack in the timing chain area. You may want to pressurize the crankcase with an air compressor set at 1 to 3 psi and then spray soapy water (a few drops of dish soap in a spray bottle filled with water) to see if you get any bubbles forming that would indicate a leak.
When my Lance suddenly started loosing oil it was the head casting that had formed a micro-fracture in the timing chain area while on my Aprilia I caused a leak due to going with Dr Pulley Sliders without putting an extra spacer between the boss and outer drive face which ran the belt out past the edge of the variator and caught the oil sump gasket. More often its the aforementioned need to adjust the valves that often shows as the oil purge tube needing to be drained more often.
I am surprised your purge tube is open and does not have a drain plug as that would tend to increase flow out the purge and increase the amount of oil purged. Also their should be some device to limit the purge on the engine that may have failed which probably needs looking in to.
Yes do keep an eye on things when you start to experience a large sudden increase in oil loss.
BTW: How may miles are now on the 260?
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Sophomore Rider
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Commuting is the best part of my day!
Posts: 213
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Joined: Feb 26, 2013 7:56:23 GMT -5
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Post by trailheadmike on Aug 30, 2015 22:24:43 GMT -5
I've got 14,350. I was hoping to get to 25K. thanks very much for your insight.
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Post by cyborg on Aug 31, 2015 14:01:41 GMT -5
Something doesn't sound right. An engine that is supposed to have 47 ounces of oil in it, is running fine with only one ounce......are you sure your drain is not plugged with something, and not letting it drain completely.....did it take the full 1.4 liters to refil to the top mark on the dipstick? With only an ounce of oil in the crankcase, not a single part of your engine was receiving an lubrication......I don't see how it would have run more than a few minutes under those circumstances. i agree ,,,that mill would have been toast within the minute,,,and would have rattled like a coffee can full of rocks,,,, |
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