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Post by thxcuz on Sept 2, 2016 7:13:17 GMT -5
Has anyone used the many stop leak products out there for oil leaks in 139qmb engines?
Do they work?
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Post by jeff84 on Sept 2, 2016 7:49:32 GMT -5
where is it leaking from? I wouldn't recommend anything other than fixing the leak properly
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Post by tortoise2 on Sept 2, 2016 9:09:50 GMT -5
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Post by thxcuz on Sept 2, 2016 9:29:05 GMT -5
It WAS leaking from the valve cover but I think I fixed that. There are still leaks...albeit less than before. So now I'm thinking oil seals. Then again 99% of my hypothesis have been wrong.
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Post by tortoise2 on Sept 2, 2016 10:04:44 GMT -5
Using synthetic oil MAY be a contributing factor. "But while synthetic oil won't create a leak, it will find one. Its streamlined molecular structure has no mercy for cracked or otherwise marginal seals." . . sourceConventional Delo 15W-40 has high amounts of Zinc and Boron. |
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Post by thxcuz on Sept 2, 2016 10:21:13 GMT -5
I'm not using synthetic.
It all started with a 47mm bbk install.
It ran great but leaked.
I put in a big head and it won't start. Weak compression I guess. I don't have a tester. The valves are checked and double checked
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Post by humanshield on Sept 3, 2016 0:02:58 GMT -5
23mm big valve heads lower the compression too much.
The gasket against the crankcase is often the cause of leaks. Did you make sure to install the steel alignment sleeves in the correct places?
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Post by thxcuz on Sept 3, 2016 0:06:58 GMT -5
Yep. Several times. I find it strange that the 2 that are near the cylinder are on the same side....unless I have that wrong and that's what is causing my issue in the first place
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Post by jeff84 on Sept 3, 2016 9:44:53 GMT -5
have you pulled the engine from the frame and taken off the cooling shrouds? that should make it easy to see where the leak is coming from.
I know that seems like a lot of work, but the more you do it, the better you get to know your scooter, and the less of a pain in the ass it becomes.
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Post by thxcuz on Sept 3, 2016 10:19:37 GMT -5
I took it all off and went back to the stock head and cylinder. Back to 49cc. The leak started when I installed the bbk. Now it's leaking somewhere else. The drip is showing up by the center stand now.
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Post by humanshield on Sept 3, 2016 10:59:25 GMT -5
Yep. Several times. I find it strange that the 2 that are near the cylinder are on the same side....unless I have that wrong and that's what is causing my issue in the first place They go diagonally across from each other.....not on the same side. |
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Post by humanshield on Sept 3, 2016 11:01:55 GMT -5
I took it all off and went back to the stock head and cylinder. Back to 49cc. The leak started when I installed the bbk. Now it's leaking somewhere else. The drip is showing up by the center stand now. Take a look at the videos on engine building. I think your leaking issues are coming from where you're putting the barrel sleeves and it's probably damaging the gasket(s) Plus, you'll damage the engine from oil starvation. Watch the video.... Go slo on the top end assembly bro  |
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Post by thxcuz on Sept 3, 2016 13:43:33 GMT -5
I'm getting conflicting info. If you watch this video at 13:12 he says the pins are on the same side, youtu.be/YJlHkSpIBQQBut this photo tells me otherwise  I'm not sure which is right |
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Post by humanshield on Sept 3, 2016 14:33:32 GMT -5
Ignore the YouTube video. Look at this.... linkEspecially this picture....  |
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Post by thxcuz on Sept 3, 2016 15:14:37 GMT -5
Looks like I am tearing down my engine again. Hopefully for the last time.
I'm getting pretty good at it.
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