Oil line replacement question

[tedder]

I seem to have developed a leak in the oil line that flows between the engine case (near #3) and the oil cooler.
(see thread post oil change leaks)

I have three questions about the oil line for those in the know,

1. Could it have failed because it is up tight against the exhaust crossover tube? I am thinking that the extra heat may have baked the rubber?

2. Does the fact that te oil line is touchine the crossover mean my exhaust is misaligned?

3. Can I replace this line without removing the heat exchangers (if the answer to #2 is a no)

Thanks (again) for the help;
this is the leak looking past the oil return between #2 and #3. The oil line is the braided SS snugging over the crossover in the pink circle

[tedder]

bump,

[MotoSook]

I think you are not getting bites because the picture doesn't easily explain what you have.

But let me try to help. It looks like someone may have clamped a hose onto the pipe that runs from the case (outlet of the scavenger pump) when they put the headers on. That pipe connected to the case was cut and a hose simple camped onto the pipe. No a good solution.

Unless they barbed the pipe, you have been lucky the hose has not come off the end of the pipe.

Do you have a stock exhaust now? If so, get the stock pipe that runs from the scavenger outlet to the wheelwell thermostat. I may have a used one off a 3.2, but the SC oil pipe will work too.

If you have headers, then there are better solutions than you have there. You can use a 74 or earlier cross over pipe that wraps under the bell housing to the right side of the engine. Then there is a smaller hose/pipe that connects it to the t-stat.

Take a better to picture so we can verify the about statements or figure out what is going on.

Edit: for spelling errors.

[Grady Clay]

I agree with Souk.

“1. Could it have failed because it is up tight against the
exhaust crossover tube? I am thinking that the extra heat
may have baked the rubber?”
Probably. Another issue in this tight confine is if the hose
bends as it is attached to the fitting. If the hose is stressed
there it will commonly leak. Since it is a braided hose, it isn’t
original Porsche,

”2. Does the fact that te oil line is touchine the crossover
mean my exhaust is misaligned?”
In the original configuration there is an oil pipe that goes
around the muffler end of the engine. That doesn’t fit if
the exhaust is changed or some other mod. The usual mod
is a rigid Porsche pipe that goes under the bell housing. Do
you still have an exhaust crossover there? If so, the pipe
won’t fit and someone has made a flex hose. It appears
that the fitting is original Porsche but the hose is braided
(non-ISO) hose. How are the two connected?

”3. Can I replace this line without removing the heat
exchangers (if the answer to #2 is a no)”
I think we first need to find why the oil hose was installed.
What heat exchangers do you have? It may very well
turn out that you will need to remove the heat exchanger.
The fitting at the case can be difficult to remove with the
oil return tube in place. That can be remedied by using a
new collapsible tube,

Here is a bottom view of a DME engine. The (red arrows)
are the original oil pipe.
"
"
© Dr. Ing. h.c. F. Porsche A.G.


Here is the OE pipe #18 from PET.
(The attachment at the case is to the left.)
"
"
© Dr. Ing. h.c. F. Porsche A.G.

Where does the braided hose go? Does it go over the
transmission or under?

Best,
Grady

[tedder]

Well, the picture wasn't great I'll admit. I had a hard time getting anything to turn up on the photo since this was above the heat exchanger. Let me try to address your questions;

The braided hose is from B&B who's headers used to be on the car. These were replaced by me and the PO to get a cat back on for emissions, but the B&B hose stayed. This is the braided hose.

It has been like this for about a year and only leaked after the recent oil change (2nd one in my tenure).

The exhaust is now stock exchangers, & crossover pipe, fabspeed premuffler and M&K 1in-1out.

Thanks for the underside photo, I had no idea that the stock line went around the muffler end. This B&B line basically goes from the case between #2 & #3 across the front of the engine to the right rear wheel well.

[Grady Clay]

At the very least, I would make a new hose assembly with properly connected fittings. Souk is correct, the hose can be pushed off the end of the smooth pipe remnant. That will run your 911 engine totally out of oil in less than a second when at revs.

There is nothing inherently wrong with running the hose over the transmission. Porsche did this for the ’70-’71 911 to clear the clutch cable. You should use three hose clamps (Adell type) to the upper left engine mount stud, the stud at the starter and one on the tin alongside the engine oil cooler. You absolutely don’t want the hose flopping about.

You might consider using some hose with a rubber outer covering or some heat-shrink tubing over the SS braid. The SS braid will wear its way into the aluminum casting.

When changing to SSI or ’74 and earlier exhaust, there is an oil pipe that goes under the bell housing and has a fitting connection alongside the engine oil cooler.

Best,
Grady