Sealing the valve guide

[Ib-Denmark]

Hi
A friend of mine have recommended me to seal the valve guides (to the valve shafts).
Can I buy such seals or can I make some myself?
The bike is G12 1965
Regards Ib
(My friend has a Norton so it wont help to look at his)

[Dixter]

Hello Ib, most people will buy them from a parts supplier. They are sold and packaged for specific engines, and are not a generic part. They come in a variety of sizes, materials, and designs. Common to all of them is the ability to allow a small amount of oil to pass thru the sealing materials.

Finding one to fit your valve guide, and still leave enough distance above the seal when the valve is fully open will be your challenge. Below is a link to an example.

https://images.app.goo.gl/KBMmNwd6JQyPimCM7

Ciao,
DC

[Rob Harknett]

The old bikes have run for years without sealers. Which have not had the years our old bikes have had, to prove themselves, they just keep on running. I would ask myself questions.
Are the sealers as equally robust? I am putting something else on the bike to fail and cause problems. Does the bike really need them.

[Mick D]

Hi

I'd be far more comfortable not fitting seals and knowing that if anything the valve stems are being over oiled rather than fitting seals which may lead to under oiling and seizure.

Regards Mick

[Ib-Denmark]

Hi

I'd be far more comfortable not fitting seals and knowing that if anything the valve stems are being over oiled rather than fitting seals which may lead to under oiling and seizure.

Regards Mick

I think You got a point there.
It will bring me to my next question:
What will be the ideal play between the stem diameter and the guide diameter?
Regards Ib

[ajsph]

Hi Ib
My manual says Inlet min 0.05mm max 0.07mm, Exhaust min 0.07mm max 0.1mm
Poul

[pkr87]

Hi
A friend of mine have recommended me to seal the valve guides (to the valve shafts).
Can I buy such seals or can I make some myself?
The bike is G12 1965
Regards Ib
(My friend has a Norton so it wont help to look at his)

Only fit seals to the inlet valve stems. What they do is to stop oil being sucked into the cylinder on the inlet stroke. As said before if the valves and guides are not worn seals should not be needed on our elderly ladies.

[Taid]

..... on our elderly ladies.

Gives me a name for mine .. "Mrs Tiverton"

Thanks