Water Pump shaft O-rings???

[Ecarta]

Dear KDXers ,
Does the waterpump shaft have 1 or 2 O-rings?
I remember putting the larger on last year only because I found it on my workbench during reassembly. (See pic) It fits perfectly in that groove and provide a seal against the back side of the bearing.

However, I cannot see any documentation/photo that it should be there. Service Manual has one grainy photo that is so bad I cannot determine if it's there or not. The parts diagram on RMMC and Motosport is inaccurate. Youtube doesn't really have any good documentation, that I can find. The article here on KDXRIDER.NET does not mention it.

Every photo on eBay only has the smaller O-ring. The Vertex water pump rebuild kit does not have a large O-ring but it really seems like it should though.

Anyway let me know your thoughts!

Thanks!

[SS109]

Parts diagram only shows one.

[Slick_Nick]

For which bike? I looked at parts diagrams for the E and H series bikes, and couldn't find an O ring under the impeller on either one. Now I'm curious, I just did a water pump rebuild, and the kit had a small O ring in it, but I couldn't find mention of it in the parts diagram, or in the service manual, so I never used it. Seems it would smoosh out as you torqued down the impeller nut.

[SS109]

For which bike? I looked at parts diagrams for the E and H series bikes, and couldn't find an O ring under the impeller on either one. Now I'm curious, I just did a water pump rebuild, and the kit had a small O ring in it, but I couldn't find mention of it in the parts diagram, or in the service manual, so I never used it. Seems it would smoosh out as you torqued down the impeller nut.

Yup, you're right. I had to look at the pic again and realized he wasn't talking about the seal but that o-ring where the impeller mounts. Yeah, that doesn't belong there.

[kdxdazz]

My memory is a little vague in this but that looks correct, should be a small o ring under the impeller but I also remember questioning why it was there

[SS109]

My memory is a little vague in this but that looks correct, should be a small o ring under the impeller but I also remember questioning why it was there

You are correct! Nick and I were wrong.

Per the manual...

waterpumporing.jpg (46.73 KiB) Viewed 1055 times

[Slick_Nick]

My memory is a little vague in this but that looks correct, should be a small o ring under the impeller but I also remember questioning why it was there

You are correct! Nick and I were wrong.

Per the manual...


waterpumporing.jpg

Well, son of a bitch would you look at that! Looks like I'll be pulling mine back apart!

Surprised it doesn't appear in the parts fiche.

[MoonStomper]

Wow! Y’all are amazing. Even when you’re wrong you get it right… this is why KDXRIDER.NET ROCKS
Happy New Year!!!

[Ecarta]

Slick Nick: bike is an H (2004)

So the only o-ring that should be present is the small one where the impeller goes? Is that correct?

Therefore the large one (in my pic) near the gear should be removed?

[SS109]

Yes, one o-ring only. Is that part closest to the gear just a rubber o-ring? It looks almost like part of the waterpump seal.

[bufftester]

That piece next to the gear on that shaft shouldn't be there. The shaft goes through a bearing, an oil seal, and then the water pump mechanical seal. The little O-ring on the end of the shaft sits under the impeller and should be there.

[Ecarta]

Yes, one o-ring only. Is that part closest to the gear just a rubber o-ring? It looks almost like part of the waterpump seal.

Ss109,
Not sure where the larger O-ring came from...saw it laying on my workbench when I last had this apart and I "ASS-umed" it went on the shaft cuz there is a grove machined into the shaft thar it fits into perfectly. Thanks for clarification!

[Ecarta]

That piece next to the gear on that shaft shouldn't be there. The shaft goes through a bearing, an oil seal, and then the water pump mechanical seal. The little O-ring on the end of the shaft sits under the impeller and should be there.

Thank you Buftester for this clarification! Now maybe I can get this thing back together!