I have a Linhai unit (~300cc) that was having a coolant leak. It looked like it was coming from the water pump cover so thought the gasket may be bad. After 2 attempted repairs with RTV, the leak still remains. It's a hard place to see so I finally was able to get a good angle and see the leak is coming from where the entire pump hosing goes into the unit.

I was working with the same part as shown in this old thread: scootdawg.proboards.com/thread/23334.

I took this part out and cleaned it good and all O-rings seemed good. I put it all back together, put some coolant in the radiator, and before even cranking the unit, it started leaking coolant again! The fact that the bearing side of this pump is covered in oil, that makes me think the O-ring is good since it's leaking coolant and not oil.

When I had the water pump out and cleaning it, I noticed there was a small hole that goes into the pump. See the below image link. The hole is right under the letter P in the image.

www.scooterpartsmax.com/index.php?main_page=popup_image&bigImg=products%2F parts%2FF039-007%2F500.jpg&pID=553

It looks like the leak may be coolant coming out of this hole. There is nothing there to plug the hole, and it's exposed even once you put the pump back in.

Any ideas? This isn't just a drip, it drains a full radiator in minutes! Thanks in advance

 

you need a new water pump.. same as a car/truck as soon as coolant starts leaking out of the weep hole its done for.. bearings are usually shot..

 

sucks to replace, but good to know the problem! Thanks! Had no clue it was called a weep hole so my google searches were coming up empty.

eBay here I come...