Vanos Seals

What are vanos seals?

The vanos unit is designed to vary the the engine intake and exhaust valve timing to help improve engine
performance.

Inside the vanos unit there are 2 pistons and in each piston there are four seals. The seals over time
leak oil due to deterioration with the manufacturers seals, which in turn causes the vanos unit to perform
poorly and effect engine performance.

The OEM o-rings are made from Buna, a material that is not suitable to withstand the higher temperatures found in automotive engines. As the piston seals are removed the OEM o-rings can be found to be extremely hard and in some cases splitting.

The long term solution is to use our 'Vanos Seal Kit' to replace the OEM Buna o-rings with Viton o-rings
which are more commonly found in the automate industry and are able to withstand the environmental
affects of the vanos units better.

It is not possible to purchase individual seals from BMW, instead they supply either brand new Vanos
units or reconditioned vanos units. However both come with the same weaker buna o-rings which will
lead to vanos seals failure in the near future again.

These can be fitted by any competent mechanic or DIY-er. There are no special tools required other than
a waterpump pulley holding tool. There is no need for any cam locking tools to perform this seal repair kit
either.


 

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