50cc gy6 where is the oil pump located By ladybambi4 (Read 7,087 times)

[ladybambi4]

i have a 50cc gy6 139qmb scooter and believe that my oil pump has went out. where is the oil pump located and how do i replace it.

[jct842]

Your oil pump is internal and is not a real easy thing to change. Why do you think your oil pump is bad? There is a complete picture series here on tear downs but before you go wrenching tell us more. If an oil pump goes out it is likely that there will be more to it than that. With out lubrication a good deal of the insides of the motor may be damaged/ john

[royldoc]

Jun 9, 2013 10:41:45 GMT -6 jct842 said:

Your oil pump is internal and is not a real easy thing to change. Why do you think your oil pump is bad? There is a complete picture series here on tear downs but before you go wrenching tell us more. If an oil pump goes out it is likely that there will be more to it than that. With out lubrication a good deal of the insides of the motor may be damaged/ john

I agree getting to the oil pump requires that you get the right side crankcase cover off, but can be done without pulling the top end off.

Here is a few photos of a case I already have tore down, Just to point out where the pump is located.

Here is a photo of the case with everything removed.



You must remove the flywheel, stator, and right side case cover. The top end and crank are removed in this photo. It is not necessary to remove the top end. This photo shows a 47 tooth oil pump driven gear.



And the oil pump behind gear.



If you do not want so split the crank case DO NOT remove the last bolt inside the cover.



There is two o-rings behind the pump to seal the inlet and outlet ports, they should be replaced if oil pump is removed. Also you should replace the crankshaft oil seal and cover gasket.

Roy