Help... oil cooler question

[BC Monroe]

I am a major newbie trying to resurrect a car that sat for about 23 years. It is a 1977 911S with a 2.7 liter engine and about 108,000 miles After lots of $$$, parts and a mechanic, it does run. Many oil leaks have been repaired but now I have oil leaking from a part that I'm having trouble identifying. I do have a set of shop manuals but I am beginning to wonder if the oil cooling on the car is a modification.

I'm very grateful for the information on the forum which has been a great resource.

The oil is leaking down and then getting down to the heat exchangers and there is lots of oil smoke. The mechanic said that the smoke was due to blow by from the rings not having seated. This could be the case too, but I can see where this is leaking. It is leaking at the brass connections in the upper right hand corner of the photo. The connections are on a hose going from the oil tank to the oil cooler mounted on the inside of the deck lid. Can someone tell me something about these parts? The connection contained a small metal ring which did not fit well. Yes that is duct tape keeping the smoke out of the car for now.

[fanaudical]

The "oil cooler" on the deck lid is not the engine oil cooler - that's the condensor for the air conditioning. You're pumping out AC compressor oil. Be sure the AC is switched off until you can fix this. (You might consider pulling the belt off the compressor for now.)

[Tidybuoy]

That is not an oil cooler on the deck lid. That is one of the two AC condensors. The second one should be mounted just under and behind the front bumper.

The oil coolers on a 911 are located in two places: 1) directly behind the engine on the passenger side and cannot be seen from the engine compartment but you can see it from the passenger fender well. 2) there "may" be the optional fender mounted cooler that will be located under the passenger side front fender well and you will see a louvered grill in front of the wheel. Some 911's will have a radiator style cooler up front and others will have a bent tube style. In both cases, you can see a thermostat in the right rear fender well with tubes that are routed to the front.

Sounds like your leak may be coming from the A/C - is your AC working?

Welcome to the forum! There are a lot of experts here and this is where I've gained most of my 911 knowledge.

[BC Monroe]

Thanks for the information. Like I said, I am a major newbie. The air conditioning is not currently working. The system takes R12 and it needs a recharge. I would have to convert it to a new refrigerant. Based on all of the other things going on with the car, that is way down the priority list. On the plus side, it is a targa so I usually ride with the top off.

[Tidybuoy]

Just fyi, you can find R12 on e-bay and craigs list for about $25 a can. However, you would need to fix your A/C leaks before charging or it will all leak out very quickly. Many shops will fill it for you and fix the leaks but you will have to supply the R12 to them.

Every person on this board was a newbie at one point .