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Post by ghcoe on Apr 22, 2015 21:23:14 GMT -5
My son purchased a Dong Fang 200cc scooter (160cc) GY6 style motor. It sprang a sever leak tonight. It has less than 500 miles on the motor. Leak looks like it is coming from the top of the head and is flowing down and dripping from the exhaust port location. Cannot exactly see where the leak is at because of the shroud. Motor runs fine and is not making any noise, but we are not running it because the leak seems to be on the pressure side and we are afraid it will pump all the oil out in a short time. Not too familiar with these motors yet, but before I tear into it I thought I would ask if there is a simple or common problem that is know.
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Oil leaking
by: geh3333 - Apr 22, 2015 21:29:46 GMT -5
via mobile
Post by geh3333 on Apr 22, 2015 21:29:46 GMT -5
Is it leaking from the vent hose or from between the head and valve cover ?
Too much oil will cause the oil to blow out of the valve cover vent hose . not saying that's your problem , just a possibility .
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Oil leaking
by: ricardoguitars - Apr 22, 2015 21:29:57 GMT -5
lain likes this
Post by ricardoguitars on Apr 22, 2015 21:29:57 GMT -5
Looks like a gasket problem, probably the valve cover gasket.
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Post by ghcoe on Apr 22, 2015 22:05:31 GMT -5
Is it leaking from the vent hose or from between the head and valve cover ? Too much oil will cause the oil to blow out of the valve cover vent hose . not saying that's your problem , just a possibility . As far as I can tell it is not blowing out of any hoses. I took a mirror and watched the spark plug area and saw oil begin to flow from what looks like a hole in the cast down to the spark plug and start dripping off the exhaust studs. The hole looks like it is suppose to be there so I think it leads to the top of the motor. Valve cover bolts seemed to be tight, not ruling that out though. Bike has been running fine and this was his first longer drive with it. He looked in his rear view mirror and saw a smoke screen behind him and shut it down. Oil is leaking pretty fast so I think it is in the pressure system. |
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Oil leaking
by: geh3333 - Apr 22, 2015 22:25:50 GMT -5
via mobile
Post by geh3333 on Apr 22, 2015 22:25:50 GMT -5
Def remove the plastic shroud and try to see if it is coming from further up or from where you suspect.
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Post by dmartin95 on Apr 23, 2015 2:26:29 GMT -5
GHcoe... I took a mirror and watched the spark plug area and saw oil begin to flow from what looks like a hole in the cast down to the spark plug and start dripping off the exhaust studs. That sounds like your EGR port... Did your sons emissions come un-bolted? The picture I'm providing is of a Cylinder Head and it's EGR port. That port (if your scoot has it) needs to either be blocked off or attached to an EGR valve. If not, you're blowing oil over the place.  |
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Oil leaking
by: JerryScript - Apr 23, 2015 10:57:16 GMT -5
via mobile
Post by JerryScript on Apr 23, 2015 10:57:16 GMT -5
Clean the engine, then blow a small bit of flour on the suspect area, then run it till it leaks enough to see the source of the leak. Post a pic and we should be able to figure out where it is coming from.
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Post by ghcoe on Apr 23, 2015 18:34:22 GMT -5
Well thanks for all the info guys. I think it might have a cracked head. The leak would be coming form the area between the exhaust port and the timing chain protrusion. I thought by looking at it with the mirror that that void went to the top of the motor, but looking at the picture above I can see there is no void through the head. I was reading where some of these heads did have issues with cracking by the timing chain area. No good pictures to where, but the descriptions seem to be about right.
I will inform once I get it figured out. Thanks again, George.
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Post by ghcoe on Apr 26, 2015 17:40:47 GMT -5
Here is a video of where the leak is. Still looks like a pressure side of the oil system as fast as it is blowing out. Cracked head or blown head gasket?
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Oil leaking
by: dmartin95 - Apr 26, 2015 17:52:26 GMT -5
Post by dmartin95 on Apr 26, 2015 17:52:26 GMT -5
Wow...Yep, you got an oil leak for sure....  ... That's the worst I've ever seen. I've seen gasket leaks before, but never one like that.... |
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Oil leaking
by: JoeyBee - Apr 26, 2015 19:32:08 GMT -5
via mobile
Post by JoeyBee on Apr 26, 2015 19:32:08 GMT -5
Yeah.... Oil leak for sure. I see a complete engine tear down in someone's future.
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Oil leaking
by: geh3333 - Apr 27, 2015 20:52:04 GMT -5
via mobile
Post by geh3333 on Apr 27, 2015 20:52:04 GMT -5
Wow , that's a leak ! Can you remove the plastic shroud and take another vid ?
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Post by ghcoe on Apr 28, 2015 12:19:39 GMT -5
Hope to get some time this weekend. I am going to take a look at that valve cover gasket again. It is a bit iffy at the head mating surface with that shroud in place. There is a gasket that goes between the shroud and the head and it looks like it may be causing interference with the valve cover gasket. The valve cover on this unit is held on with two bolts that go through the cover into the top of the head. They have a flange on them that allows you to only tighten the valve cover so tight. Seems to me that the leak was worse after I took the valve cover off and reinstalled it. Although, I think I should be able to see a leak at the valve cover, but weirder things have happened.
If that does not work then I will be taking the shroud off to inspect closer. Thanks for the help guys.
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Oil leaking
by: geh3333 - Apr 28, 2015 13:03:11 GMT -5
via mobile
Post by geh3333 on Apr 28, 2015 13:03:11 GMT -5
I don't think its leaking from the valve cover gasket . that's a lot of oil flowing. Unless something is keeping the cover from closing completely on one side I don't think it going to be the gasket. But I've been wrong before , lol.
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Post by ghcoe on Apr 28, 2015 13:50:20 GMT -5
Yup, that is why I am leaning towards a cracked head or head gasket. Going by the amount of leakage I am thinking the pressure side of the oil system. I can not think that simple flow back to the case would leak this fast. I am assuming that the oil system supplies pressure through a head bold cavity? Have not found a schematic showing the oil pressure routes to the head so just guessing until I can look into this farther.
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