Clatter, clatter, knock, knock

scam75 · **Posted:** Tue Sep 06, 2016 8:24 pm

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

zcacogp · **Joined:** Tue Mar 25, 2008 7:05 pm **Posts:** 211

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.

mr brightside · **Posted:** Wed Sep 07, 2016 6:37 pm

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?

zcacogp · **Joined:** Tue Mar 25, 2008 7:05 pm **Posts:** 211

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.

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Clatter, clatter, knock, knock

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