1977 930 Rebuild
 

Well I've finally started to pull my motor to pieces, and all was going well until I'd just finished removing the left side cylinder head bank. I was just repositioning the motor to remove the right hand cylinder head bank, turning it through 180 degrees, when I heard a clunk in the drip tray under the engine. When I looked down I found a 10mm ball bearing. Now I think I know where it came from, but I was wondering if someone could confirm this for me. At the front of a my turbo motor, next to the oil thremostat, there is a fitting that holds the oil pressure switch, and a banjo oil joint for the copper pipe that runs across the engine to the turbo. I'd removed everything from this fitting, and left the fitting in the case while I attacked the chain cases and heads. I presume the ball bearing sits in this fitting as a check valve for oil going to the turbo. How'd I do?

winner! winner!

Yes you are correct. That ball prevents down hill gravity oil flo into the tbo when the motor is shut off as the ball will sit on the seat. This keeps the tbo from filling up with oil andgetting huge smok clouds and an intake full of oil when one next starts the car up and heats up the muffler.

Kevin Roush
GAS Motorpsort
Performance Porsche
909 985 2909

Thanks guys for clearing that up for me. The adventure continues!!!

kevin, i said the same thing in a past thread, but i don't think anybody believed me. most were sure that it limited the oil flow to the turbo, which in turn would keep the engine from smoking.

It's because your credibility stinks John.

:)

Just kidding, who would ever doubt you (besides your wife, I'm sure)...

-Wayne

Thanks, the search function comes to the rescue again.