Cam Seal Leaking... still

[Its been a long time]

Some of the aftermarket seals are made of nitrile and they aren't up to the job. They'll soon leak which is what I suspect is the case in the post above. It's a very difficult environment for a lip seal. Use the OEM seal and O ring, the problem will go away.

 

[5twins]

I wouldn't recommend those. That "25044" part # is the 6mm thick seal. You want the 5mm thick seal, the one with "25090" in it's part #. It is still available from Yamaha but the price is pretty high .....

https://www.partzilla.com/product/yamaha/93102-25090-00?ref=31a713d198e476543ab22f84bf66662c5fc3796b

You can probably find them for much less on eBay.

 

[Oldfartaussie]

I reckon that this has to be wishful thinking.
2026 xs650.

 

[jetmechmarty]

I reckon that this has to be wishful thinking.
2026 xs650. View attachment 356950

I think it safe to say that it's not happening. I expect it's highly unlikely that I would buy it anyway. The old ones work fine. It's the same as my 1957 Kirby vacuum. It still works fine. Why replace it? I guess I'm making a case for planned obsolescence. But then I'd think it junk, and I still wouldn't buy it.

 

[jetmechmarty]

My last post on the leak was 2022. It's still not leaking. I admit that my miles are going on the XS650SH. I guess I like it best.

 

[willis]

+1 on OEM seals. Fixed my leak on my 75. Are you running the seal and gasket both as recommended?

 

[jetmechmarty]

+1 on OEM seals. Fixed my leak on my 75. Are you running the seal and gasket both as recommended?

Frankly, I don't remember what I did. My MO is "fix it by the book."

 

[willis]

Pretty sure the book calls for both. I followed your thread before I did mine.

 

[5twins]

Seal, gasket, and o-ring. I like the original red o-rings (I think they're silicone) and re-use them usually. I tried the black ones that came in the Athena gasket kit but they deformed (turned "square") after a few years. I couldn't re-use them when I removed the housings. Luckily, I saved the original red ones, lol. They were still "round" so back on they went.

 

[Its been a long time]

Seal, gasket, and o-ring. I like the original red o-rings (I think they're silicone) and re-use them usually. I tried the black ones that came in the Athena gasket kit but they deformed (turned "square") after a few years. I couldn't re-use them when I removed the housings. Luckily, I saved the original red ones, lol. They were still "round" so back on they went.

Indeed, the camshaft sealing is one area where I wouldn't use aftermarket hardware. The Athena O rings are almost certain to be nitrile material and not up to the job.

 

[rickthefix]

https://www.ebay.com/itm/197594820917?_skw=yamaha+xs650+cam+seals&itmmeta=01K41KN1ZSJNB2PXEA44J59FC8&hash=item2e0191b135:g:-dsAAeSwbixok1we&itmprp=enc:AQAKAAAA8FkggFvd1GGDu0w3yXCmi1dbn4qz0TEukEJqM9R1PwiaBOhnVWVqzWn2Fq--PijFl2rfWn68VanRKGAtZCQPbvxZIP3i79rgK7ysNK6gOMGc2S7syWaLC8WMTW8SDLLHgN158dTsMcYgF5Dtd1H18J10+8PaaBk/+cKYTE25es0CivH1Emyq92gJxIKdfCnLgfwK1vrE6Vt/FoZwhIR64uk5RVbRABAFzxZok39J99XyOVHQv0rcQA9w0VdTQSXqTUbxfaTab0fGrqElUII7A1mIr7tZO0GxkaN8ASZ5dZ73rGPE+ufudMR/zEfsZ1PAiA==|tkp:Bk9SR4yg1LOgZg&pfm=1
Heres some OEM. I’ve done OK with the aftermarket as long as they are ARS

i'm leery of NOS seals, bitten by that before. Never know the age and storage

 

[rickthefix]

I bought some good quality seals, will reuse the gasket and put a thin film of sealant on it. Should be GTG as soon as sciatic pain subsides so I can put it all back together . . .

 

[Its been a long time]

I bought some good quality seals, will reuse the gasket and put a thin film of sealant on it. Should be GTG as soon as sciatic pain subsides so I can put it all back together . . .

Don't forget the O ring.

 

[5twins]

And also make sure you push the seal in as deep as it will go, so it's even with the back of the housing. The cam end doesn't stick out much so the seal needs to be pressed in deep like this for it's seal lip to get on the end of the cam.

In fact, you may want to press it in even deeper, so it hangs out the back of the housing about a MM or so.

 

[bazz]

And also make sure you push the seal in as deep as it will go, so it's even with the back of the housing. The cam end doesn't stick out much so the seal needs to be pressed in deep like this for it's seal lip to get on the end of the cam.

View attachment 357468

In fact, you may want to press it in even deeper, so it hangs out the back of the housing about a MM or so.

Did this hold up with no leaks?

 

[bazz]

Has anyone tried reversing the seal so the lip sits on a different part of the cam ?
Yes I know it sounds wrong but a mate of mine noticed a difference in a Ducati workshop manual where it showed the crankshaft feed oil seal which is under considerable pressure fitted either way
My mate got onto Ducati and they said don't worry about it and it'd work either way!
As he has an inquisitive mind he tried the seal either way with an oil pressure gauge fitted
And sure enough the pressure was exactly the same
I think he said it was around 80psi
I can only assume the pressure isn't high enough to lift the skirt of the seal?

 

[Its been a long time]

Are you using Yamaha camshaft seals and carrier O rings? Some of the aftermarket seals and O rings are nitrile material and not up to the job. It's a very difficult environment up there on the cylinder head. I would advocate only using Yamaha parts for that job.

Also this -

Post in thread 'Tips and tricks' https://www.xs650.com/threads/tips-and-tricks.69012/post-896454