sctrdawg
Scoot Enthusiast
scooter bum
Posts: 149
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Post by sctrdawg on Sept 1, 2010 12:06:24 GMT -5
:stars: I recently rebuilt my QMB139 my oil pump drive gear won't work w the new crankshaft are there different gears for this!  thought all parts for QMB139 were the same :banghead: :rant: this scooter is drivin me crazy and i can't afford to take it to a mechanic!!Help!! |
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Post by 90GTVert on Sept 1, 2010 12:20:28 GMT -5
I also thought they were all the same. I inquired about a high volume or flow pump and gear I saw some time ago and even that seller told me he stopped selling them because they turned out to be exactly the same as stock. Got any pics or anything to help show us exactly what is up? Maybe somone would have an idea of how to fix the problem.
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sctrdawg
Scoot Enthusiast
scooter bum
Posts: 149
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Post by sctrdawg on Sept 1, 2010 15:23:15 GMT -5
No pics ! it just won't mesh with the gear on the crankshaft!! i can tap them together and when i start the motor they come out of mesh ! when i take the case back apart they are side by side and not meshed together ! and when i remesh them and start it up again ,after putting the case back on, it happens again which means the oil stops pumping and my piston heats ,swells and siezes!!
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sctrdawg
Scoot Enthusiast
scooter bum
Posts: 149
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Post by sctrdawg on Sept 1, 2010 15:25:19 GMT -5
when it cools down it works again!! until i find out what the hell is going on i'm not even going to try to star it again!! don't want to cause real damage !!
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Post by 90GTVert on Sept 1, 2010 16:25:16 GMT -5
It's either the wrong gear, the gears are aligned wrong from improper positioning of or on the crank or of the gear on the pump. I don't think the pump could even bolt on more than one way. I'm not 100% sure on that. I've really only built one GY6 from the crank up and it was easy enough that I don't even remember all the details with the pump drive.
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Post by scooterrebel on Sept 1, 2010 17:44:04 GMT -5
you are referring to part number 10? and part number 11 is there in place?  |
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sctrdawg
Scoot Enthusiast
scooter bum
Posts: 149
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Post by sctrdawg on Sept 1, 2010 17:54:50 GMT -5
Yes ! there is only one way it can go !! when i install it the teeth on the gear don't fit in the teeth on the crank sprocket!! IT JUST DOESN'T MAKE SENSE! WHY IT WONT WORK? IT CAME APART AND WENT BACK TOGETHER THE EXACT SAME WAY !! WHAT IN THE HELL AM I DOING WRONG???
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Post by 90GTVert on Sept 1, 2010 18:00:55 GMT -5
I don't really see what could be wrong other than a part thats made wrong? If you have the proper gears and your crank and oil pump are installed properly, it's pretty much fool proof. Sine you have a new crank, I'd advise taking a good look at the old crank and it's pump gear and the new one to see if anything is different.
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sctrdawg
Scoot Enthusiast
scooter bum
Posts: 149
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Post by sctrdawg on Sept 1, 2010 18:08:00 GMT -5
Bout to go do that now ! been so disgusted w it i haven't touched it since Sat.
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Post by scooterrebel on Sept 1, 2010 18:29:47 GMT -5
I know, sometimes it is very frustrating you think everything is done just right but it does not do what it is supposed to do. I find that usually when it happens to me that if I step away for a while get over the frustration then go back and look at it again, I see the problem and kick myself.
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sctrdawg
Scoot Enthusiast
scooter bum
Posts: 149
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Post by sctrdawg on Sept 1, 2010 19:05:50 GMT -5
NOT THE CASE THIS TIME EVERYTHING IS AS IT SHOULD BE AND STILL NO CIGAR!! The sprockets on the cranks are exactly the same!! I'm going to lose it!!
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Post by 90GTVert on Sept 1, 2010 20:32:56 GMT -5
What has play in it that allows them to get closer together or separate? Neither the oil pump nor the crank should be moving around enough to allow the gears to move.
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Post by Fox on Sept 1, 2010 21:35:11 GMT -5
Dude! Just buy a new engine and be done with it! The link below has a great deal on one. Not only do you get a new carb, air filter and starter, But it even comes with a new ignition coil and CDI. These engines are good and they will drop it off right at your front stoop. (If you have a stoop)  www.pccmotor.com/139qmb-50cc-4-stroke-gy6-scooter-engine-motor-au1395046.htmlOr.... you can keep splitting cases till you are ready to dynamite your scooter out of frustration. It's so much easier to start fresh with as new motor. You may have to change the stator coil but that's it and you'll have a whole engine for spare parts after. Variator, Clutch, Carb, Everything! That's my two cent theory anyway... |
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sctrdawg
Scoot Enthusiast
scooter bum
Posts: 149
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Post by sctrdawg on Sept 1, 2010 22:33:59 GMT -5
CAN'T afford that fox !!i'm unemployed at the moment!!
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sctrdawg
Scoot Enthusiast
scooter bum
Posts: 149
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Post by sctrdawg on Sept 1, 2010 22:39:17 GMT -5
there is no play the metal sprocket on the crank forces the plastic gear off to the side of the sprocket!say you take the flywheel and stator assy. off and take the case off to see the oil pump set up what you see is the sprocket w the gear teeth forced behind the sprocket !! wish i had a camera ,cause this shit is not supposed to be this way!!
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thought all parts for QMB139 were the same :banghead: :rant: this scooter is drivin me crazy and i can't afford to take it to a mechanic!!Help!!
