Cam Cover - Oil leak

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Hi All
Seem to have a slight oil leak at rear of cam cover, oil seeping over engine numbers and dripping onto exhaust manifold, causing 'puff's of smoke, and black smoke from manifold while on initial warming up. Is this a common fault and is it an easy fix ?
Thanks Guys

 

[Diver944]

The rear cam housing gasket is a common leaking point - its made of cork!

The following procedure is lifted straight from www.clarks-garage.com

Rear Cam Housing Gasket Replacement
The rear cam housing gasket is not very difficult or time consuming to replace. However, the bolts that hold the rear cover in place can be a bit difficult to get to. I'm not sure why but, Porsche used a cork gasket on the rear cam housing cover. They are notorious for leaking and usually start giving problems shortly after the car has 50,000 miles on it.

1. The rear engine lifting ring is attached to the rear cam housing cover. If the car is equipped with a TDC sensor there will be an electrical connector attached to the rear engine lifting ring. If so, remove the 10 mm bolt that hold the electrical connector retaining strap to the lifting ring and move the connector out of the way.
2. There are three bolts (M6) which hold the lifting ring and rear cover to the cam housing. Using a 10 mm socket or wrench, remove the bolts.
3. Apply a thin coat of bearing grease to both sides of the new gasket (Figure 1, 9).
4. Position the gasket onto the rear cam housing cover and install the cover and lifting ring onto cam housing using the three M6 x 22 mm retaining bolts.
5. Torque the retaining bolts to 8 Nm (6 ft-lb).

 

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Thanks Paul - appreciated