Porsche 964 C4 Oil Leak Repair Rennsport Kansas City
Had this little C4 in the shop this week to fix a couple of nagging oil leaks.
One of them was a leaking oil line from the reservoir tank to the thermostat. A real bugger to get out actually.
Then we had a nagging leak from the main oil line from the case to the reservoir. The old style line was rubber crimped, which ran right next to the hot exhaust. That doesn’t work over time. The downside is that the entire exhaust has to come off to replace this line.
Because it runs up over the top of the factory heat exchanges to the case. Not enough room. With aftermarket headers, it is possible without full removal.
So off comes the exhaust.
And a better shot at where the line attaches.
New, updated line in place with the upgraded braided hose to resist the heat of the muffler.
The downside of pulling heat exchangers on these old cars are broken studs. No matter how careful you are, if you do enough of these, you will break studs off due to corrosion. A steel stud in an aluminum head over time will create galvanic corrosion and they will become one.
But I have a way of dealing with broken exhaust studs on heads. I love this tool
After selecting the correct die for the exhaust port, the tool is installed over the broken stud, and a pilot hole is drilled using the proper bushing.
A hole clean through the stud. Next, you change to a larger bushing and drill bit and drill you next size.
Once that is out, you simply take a small pick and catch the only part of the stud that is left….the threads.
And with a pliers, carefully pull the stud threads out of the threads of the head.
The tool is so precise, it drills close enough to remove almost the entire stud WITHOUT damaging the original threads in the head. All that is left of the old stud are the threads. The procedure will work on pretty much all exhaust ports of different model heads. It is slow, very precision work, but it does a fantastic job of not messing up the head. Trying to center punch and drill out a stud while keeping everything perfectly straight is almost impossible. You might get lucky, but the odds are against you.
A thread chaser will clean the threads and will almost always just turn in and out by hand.
And at that point, the exhaust can go back on.