Front sprocket shaft oil seal replacement

[stou]

There's a leak from the front sprocket shaft oil seal. I tried to replace the seal like I do with regular seal  with no success. This seal have a lip all around that go into a grove in the engine cases, that make it difficult to install without spliting the cases. I heated the cases with a heat gun to get the metal to expand, but it did not much to help the seal install.

Is there a trick to do it?

[copper]

Did you contact whoever you got the seal from? I contact Randy or Robert at RPM if I can't figure something out that I got from them and they are more than happy to help.

[FJ_Hooligan]

You need to use a non-OEM seal without the lip.

I believe that's what RPM sells

[RPM - Robert]

Nope, the seal we sell is the Yamaha seal. If it is like the crank seal, there were two different seals. The original seal had a big lip that sets in a grove and allowed for assembly line/ machine assisted assembly. The later replacement seals did not have these lips on them as you would not be able to replace with out having to split the case halves. The crank seal I know superseded from 00-09 ending. I don't have any old seals as we send them back with the owner or toss them out to show the difference.

I know the crank seal superseded to a 09 from an 00 ending but I don't have/see a different number for the transmission seal.

Also, been awhile since I had a completely stock/untouched motor apart and do not recall if the trans seal is like the crank seal. Most the engines we are building have been worked on before and all the seals replaced.

[stou]

You need to use a non-OEM seal without the lip.

I believe that's what RPM sells

I bought an OEM seal at my Yamaha dealer. Before that I looked at General Bearing near home and they only have a 5mm in those size, no 6mm. I'll look around for a non lip 6mm. Also the seal of the clutch push rod is not easy to get. 8.8x22x5. I have one on order at the dealer, but they are back order. I can't find that size on the web.

Thanks for the info!

[RPM - Robert]

You need to use a non-OEM seal without the lip.

I believe that's what RPM sells

Also the seal of the clutch push rod is not easy to get. 8.8x22x5. I have one on order at the dealer, but they are back order. I can't find that size on the web.

You're not looking in the right place then. I might even know a guy that has a few thousand in stock, just maybe.

[stou]

You need to use a non-OEM seal without the lip.

I believe that's what RPM sells

Also the seal of the clutch push rod is not easy to get. 8.8x22x5. I have one on order at the dealer, but they are back order. I can't find that size on the web.

You're not looking in the right place then. I might even know a guy that has a few thousand in stock, just maybe.

You have the 8.8x22x5 in stock? I looked twice on your website and didn't saw them!

[big r]

Stou, if you don't see it just ask. Randy will probably have it or will know were to get it. He is amazing at getting parts and his delivery is really fast to

[stou]

I saw this kit who have the seal in it:

https://www.rpmracingca.com/proddetail.asp?prod=Clutch%3AS%2FK&cat=39

I ordered this kit last winter to rebuild the clutch slave cylinder! I looked in my boxes of parts and found the 8.8x22x5 seal!

Now I just have to find the 40x62x6 without lip. This will be easier, I saw this size on some website. Maybe the 40x62x5 can also do the job. There's some available at a shop near home.

[RPM - Robert]

You need to use a non-OEM seal without the lip.

I believe that's what RPM sells

Also the seal of the clutch push rod is not easy to get. 8.8x22x5. I have one on order at the dealer, but they are back order. I can't find that size on the web.

You're not looking in the right place then. I might even know a guy that has a few thousand in stock, just maybe.

You have the 8.8x22x5 in stock? I looked twice on your website and didn't saw them!

Yes indeedy. They are listed with the Yamaha number not the size

http://www.rpmracingca.com/proddetail.asp?prod=93109-08061

Glad you found one you can use.

[stou]

Thanks Robert!

[racerrad8]

That is the only trans output seal I have ever seen or used. Yes, there is a small lip/ridge to position the seal properly during a build.

As far as replacing the seal, that is the only seal I am aware of for use. You must use a driver and drive it in using only the outer edge. The rubber lip will shear off and you just drive it in until flush.

If you drive anywhere other than the outer edge of the seal, it will leak...

Randy - RPM