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Valve Stem Seals in Place

Posted in Maintenance, Technical

Posted on

Problem: Light puffs of smoke from exhaust on idle and pull off – smoke increases.
Major internal oil consumption – +/- pint per 1000KM

We have the tool to do Valve Stem Seals in place.
Done, Tried and tested – Shaun is happy to offer this.
Before we would quote to take off the cylinder head and have it reconditioned. With this option the head does not come off.

See picture of the old valve stem seal – it is swollen and hard
(New seal – orange one – smaller hole)


Once done you notice it immediately, no smoking and no eating of oil.
Email office for a quote and please state which vehicle you have

Notes from a previous article regarding Valve stem Seals

Cars prone to these symptoms – Petrol engines

  • 318 E46 (2001 – 2005) – N42 engine – facelift
  • 320 E90 (2005 – 2009) – N46 engine
  • X5 4.4 , 4.6, 4.8 (2000 – 2006)
    735, 745, 750 E65 E66 (2002 – 2008)

The Problem:

The valve stem seals harden and swell in the head due to age and heat. Valve stem seals allow for small amounts of oil to lubricate the valve guides. The seal has a lip (oil- metre) on it. When the seals age or harden there is no resistance and the high intake vacuum sucks oil into the combustion chamber. The oil burns in the chamber and this will make the car smoke. The longer the car goes on with this problem the bigger the coke build up on the valve guide and this could cause a loss of power.


External leaks:

The seals, gaskets and o’rings all become hard due to age and heat. Make sure these are in order.
The most common areas is the

  • sump, gasket
  • vacuum pump seal
  • oil filter housing seals
  • tappet cover gasket
  • Oil separator (breather valve)
  • Oil filler cap