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Post by usmcdoc on Nov 4, 2011 14:06:07 GMT -5
I have new Tank Urban Sporty 100(2006...but was showroom model with zero miles) I ran like a champ for 800 miles without a hitch. I check the oil weekly and keep it at the proper level on the stick at all times. Yesterday I drove 4 miles to the store and the airbox and CVT cover were covered in oil.Checking the oil...it was empty...so I brought it back up to the proper level...wiped all the excess of and drove the 4 miles back home. Once at home airbox and CVT were again saturated with oil and the engine was empty.None of the oil is getting on my paper/foam air filter..it just drips from the bottom and hwo knows where else. I checked all hoses for holes and kinks and all is fine. Running it @ 6000 rpm on the center stand for 5 mins....and there is not a leak...I even disconnected to engine vent line from the air box and no oil spray except a fine mist on my finger(barely a trace) Ran down the road 2 miles with box on and oil all over the airbox and CVT again. Next I pulled the vent line from the airbox..wiped all the oil off...and secured the vent line to a cable with a zip tie(making sure not to pinch or occlude the line) Down the road again 2 miles....and it was saturated with oil and the crankcase was nearly empty. Not sure how it can run 5 mins at 6000 rpm on the center stand and be ok....but when you ride it....it sprays oil all over. I pulled the plug(cap on the end of the drain tube) and drained the overflow tube on the box where the vent line connects...still get the same results. Anybody familiar with this or have any ideas?...cause I am completely perplexed and frustrated....  ....btw the the Tank 100 is a oddball they made....it is a 150 short shaft engine with a 100cc bore....other than that everything is identical to the standard 150... |
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Post by speedy1125 on Nov 4, 2011 14:15:44 GMT -5
where is it blowing out at?
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Post by usmcdoc on Nov 4, 2011 14:32:04 GMT -5
It comes from the vent line off the cylinder head if you unplug it from the airbox. If you connect it back to the airbox....it fills the bottom of the airbox and leaks from there.. Running at 6000 rpm for mins on the stand you get nothing.....drive it down the road and you lose all kinds of oil..
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Post by speedy1125 on Nov 4, 2011 14:44:28 GMT -5
so revving it with no load its fine. under load is blows all the oil out the PCV line. its building crankcase pressure up for some reason. weird.
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Post by speedy1125 on Nov 4, 2011 14:46:37 GMT -5
i am not familiar with that exact engine so i really am not sure how to visualize its workings. does the case say qmi, qmj or qmb? they are all 'gy6' but it would help to know exactly what we are dealing with.
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Post by usmcdoc on Nov 4, 2011 15:13:27 GMT -5
1p47QMG is the engine number.
The first number is the number of cylinders, the second, a P, is code for a horizontal engine. The next 2 numbers, 39, is the bore diameter in mm, 39mm bore. The next letter, F, indicates that it is natural (not forced) air-cooled style. The next letter designates that it is a motorcycle engine "M". The next letter reveals the full engine displacement. B is code for a 50. C for a 60, D for a 70, F for a 90, G for a 100, H for a 110, I for a 125, J for a 150
It is the EXACT short case 150 QMJ engine.....just has a 47 mm bore vice 57 mm for the 150
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Post by usmcdoc on Nov 4, 2011 19:07:56 GMT -5
Already adjusted the valves they are spot on.....004 for intake and exhaust.... It seems something is causing too much pressure. In the valve cover I see a mechanism attached between one side of the intake and exhaust rocker on the right side.....what its function is...I have no clue as none of my gy6 50cc engines have one.. Reminds of of the 'oil slinger' Briggs and Stratton used to have on the bottom of the con rod to splash the oil around. It is thin meat with a small spring in it..maybe it is defective?...no clue what it is even for....been into lots of gy6 50....not a gy6 100....125..or 150...but maybe they all have this odd part?
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Post by Fox on Nov 4, 2011 19:16:10 GMT -5
I think you have something blocking the oil passages that allow the oil to flow back to the sump so it pumps all the oil to the valve cover and it can't get back to the sump. Pressure builds in the valve cover and it is released through the vent. Could be a piece of debris that fell into the engine on the assy. line or whatever. :dunno:
You need to remove, inspect and re-build the top end making sure to clear all the passages. Check the bottom end passage(s) too. You may have to rebuild the engine with a new gasket set.
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Post by speedy1125 on Nov 4, 2011 19:21:53 GMT -5
Already adjusted the valves they are spot on.....004 for intake and exhaust.... It seems something is causing too much pressure. In the valve cover I see a mechanism attached between one side of the intake and exhaust rocker on the right side.....what its function is...I have no clue as none of my gy6 50cc engines have one.. Reminds of of the 'oil slinger' Briggs and Stratton used to have on the bottom of the con rod to splash the oil around. It is thin meat with a small spring in it..maybe it is defective?...no clue what it is even for....been into lots of gy6 50....not a gy6 100....125..or 150...but maybe they all have this odd part? would love to see a photo of that |
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Post by usmcdoc on Nov 4, 2011 19:26:40 GMT -5
Stroker....will do a pic in the morning.....
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Post by usmcdoc on Nov 4, 2011 19:29:10 GMT -5
Fox...will pull the head and look for that tomorrow. I thought oil return to the engine block was through the large hole n the left that the timing chain and cam ride in.....or is there another hole?
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Post by Fox on Nov 4, 2011 19:55:41 GMT -5
Yeah, I guess the chain passage is a huge hole for oil to drain back down through so disregard my last post. I was mistaken.
Maybe there is something wrong with the valve cover/vent? :dunno:
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Post by usmcdoc on Nov 4, 2011 20:06:20 GMT -5
Ok here is a pic of the part in question....anybody know what its function is....and may this be causing my problem?.... :stars: Attachments:
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Post by Fox on Nov 4, 2011 20:23:53 GMT -5
Try this: Disconnect the vent tube from the valve cover and connect a 3 foot long piece of tubing to the valve cover and run the engine with the tube in your hand elevated straight up as high as you can and see if oil shoots out. If it doesn't shoot out, lower the tube slowly and see at what level the oil starts to shoot out.
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Post by usmcdoc on Nov 4, 2011 20:37:44 GMT -5
Fox.....ok...will try that...but what is it going to tell me?....if at 2-3 above vent nothing comes out....yet when level with the engine it does...what would that tell us? Also vent is clear.as the hose is...I blew into them with my mouth...no resistance at all.
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....btw the the Tank 100 is a oddball they made....it is a 150 short shaft engine with a 100cc bore....other than that everything is identical to the standard 150...
