6.0-928S

Hey friends, would any one have a diagram of the cam cover crankcase breather hose routing on my 89GT. Both sides but mainly the driver's side cover hose. Mine is broken off. Where does it go?

TIA, Hammer

Michael Benno

Consider reviewing the information in this post. It has diagrams for all iterations of the S4/GT/GTS breather setups: https://rennlist.com/forums/928-foru...r-ideas-5.html

6.0-928S

Thanks but none of these gave a definitive answer to where my hose should be going. It's comes off the cam cover fitting and goes under the intake where the break is.

Hammer

Michael Benno

Can you maybe post a photo of your engine, and valve cover with the broken off hose? I am assuming the driver side valve cover you are referring to is the right side (driver's right). 1989 cars should not have any hoses on the right side valve cover. In 1994, Porsche added a breather hose to the front port on the right side valve cover to the left side valve cover. Porsche never used the rear port on the right side valve cover. What you describe does not align to any known Porsche configuration so it may be that your car has been modified in some manner,

hernanca

Hammer, below are what the 928 Specialists site shows for the stock configurations of 89 GT vs. GTS. It shows, as Benno indicates, that only the GTS had driver's side* breather hoses.

My thoughts are that either:
1. It is not a breather hose (I am not familiar with everything that comes out of the 89 GT cam covers, but I know I have seen other ports in 928 cam covers besides those for the breathers and spark plugs.), or
2. You had previously experimented with increased breathing for your motor and so it does not follow the stock configuration.

Also agree that pictures would help!

(*Note: my understanding is that we refer to parts of the car as if seated in the car, EVEN in the case of the motor which we are often standing in front of and pointing at from an opposite perspective! Someone please correct me if this is not a common convention!)

6.0-928S

Thanks for the help. Today I had access to the parts catalog (It was at work & I had off till today) & it shows what you said, that the driver's side cover did not have a port but a plug in both ends of the cover. It appears that the previous owner put in a port & just ran a hose under the intake open to the atmosphere. When I first bought the car years ago Capt. Earl & I were working on it & he said he could see oil in my valley & an open ended hose just laying in there which puzzled us both at the time. Now I know which hose that was. The car was running great so I didn't pursue it at that time. I'll just cap off the port like it is supposed to be. Thanks for all the help!

Regards, Hammer

hernanca

As I understand it, when you cap that breather hole off, the motor will have one less breather hole to vent pressure through at high rpms. Therefore, all the remaining breather holes will have to handle that pressure, and there is often frothy oil/mist near breather holes. This new (closer to stock) combination can lead to more frothy oil/mist exiting the motor through those remaining breather holes, to wherever their destinations may be. Stock setup ends up at the intake tract. The PO may have been trying to minimize that intake tract oil ingestion.