Porsche Enthusiasts Club Forum

Some oil filters purporting to be fit for purpose do not have said valve and can cause this. Maybe worth popping on a genuine Porsche or known equivalent one and seeing if your problem goes away.

Stuart

mr brightside wrote:I've got this issue, it's only from cold and a bit embarrasing sometimes tbh.

Why does it happen? Is there a NRV in the gallery to the top end that fails, or is it symptomatic of pump wear?

There is a non-return valve in the corner of the cylinder head which apparently fails fairly often but is easily removed and cleaned and then it's as good as new. However no-one seems to be very clear on the symptoms of failure; drained tappets (i.e. lots of noise on start-up) would seem logical and if you are suffering from this then removing and cleaning the valve would seem a sensible step to take.


Oli.

zcacogp wrote:

mr brightside wrote:I've got this issue, it's only from cold and a bit embarrasing sometimes tbh.

Why does it happen? Is there a NRV in the gallery to the top end that fails, or is it symptomatic of pump wear?

There is a non-return valve in the corner of the cylinder head which apparently fails fairly often but is easily removed and cleaned and then it's as good as new. However no-one seems to be very clear on the symptoms of failure; drained tappets (i.e. lots of noise on start-up) would seem logical and if you are suffering from this then removing and cleaning the valve would seem a sensible step to take.


Oli.

Is it a head off job, or a rocker cover off job?

On the S2 it's a rocker cover off job, and looks pretty easy.

On the 8v head models I don't know where it is, but those ones don't have a rocker cover so I presume you don't have one!

It's part number 944 107 239 01 and there are more details here:

http://rennlist.com/forums/944-turbo-an ... -head.html


Oli.