Hi guys, new to this forum. Was hoping to find some help on some problems my 930 is experiencing. On my 79 930 the temp ALWAYS gets up to the line before the red (10 o clock) Sometimes during the day it creeps up to the red and I have to pull over and let it rest. I have had the car for a few months and the car has always ran this way. I just thought it was normal to get to the 10 o clock position, as long as it wasnt getting into the red. My oil cooler is in the front fender with no fan. I have made it in my front bumper where I have DIRECT air running to it, but that doesn't seem to make a diff. I traced to lines back and they aren't crushed. What could make it run so hot? My next problem just occured. Since thursday my car has been leaking oil, only when it gets hot. I can start the car and romp on it, boosting it to full 1 bar a few times and there is NO LEAKS. When it gets to the 10 o clock position it starts leaking bad and dripping on the headers making it smoke like crazy. I checked the oil line running from oil filler and sealed it, I checked the oil pressure unit and tighten it up as much as possible. Funny thing is if I drive it and leave it in the garage over night there won't be any oil leaks. Im confused on what could cause this. I see a good amount of oil if I look under the intercooler where the throttle linkage is. It almost looks like its coming up from the intake manifold(?) I know its leaking at the top of the engine and falling to the bottom. Are there any oil lines behind the CIS system that that could leak? As long as the temp stays down I can run full boost and it doesn't leak or smoke. There is absolutely no smoke coming from the exhaust, just the headers when oil falls on them. I dont have the stock airbox and just an oil filter on the hose and it's not overfilled. Also when it starts leaking the temp gauge rises really quick about 20 degrees. Can someone PLEASE give me some insight on what could cause these problems? Im thinking something in my engine is blown. Any help will be greatly apprecaited. Thanks for reading.

btw my car starts and runs good

 

These are the oil lines on top of the motor: turbo oil feed line, crankcase breather line. In addition, oil can come from the thermostat (blown seal or in your case, possible failure) or oil pressure sender.

Since you car seems to overheat quickly, it seems as if one of your thermostats is stuck or failed. You have one on top of the engine that opens the engine oil cooler, and another in the oil line (just in front of the right rear tire).

The easiest thermostat check is to drive the car to operating temp and feel the oil cooler in the right front fender. If its hot, most likely it will be OK.

Next, check the engine thermostat. It's held in place by 2 10mm nuts and can be pulled out, straight up. It will be tight, so take your time LIGHTLY prying the cap with a short flat (and wide) screwdriver. Take the thermostat, clean it up, and put it in boiling water to see if it opens.

You need to thoroughly clean the motor of all oil to check for leaks. Then add some dye (from NAPA, etc), drive it a little, and use the ultra-violet light source to see where the oil is coming from.

This is some easy stuff you can do at home in an hour or so.

 

thanks Done, I thought the car had one thermostat which was in the front. I have pulled this out and the seal around the thermostat looked horrible. Im thinking that has to be where the oil was coming from because when it started leaking at a certain temp the temp would rise real quick. Im hoping this is the problem. How would the thermostat get stuck or fail? thanks

 

Because its mechanical - granted not very common tho.

 

i put it in boiling water but nothing, how do I know if its opening?

 

did it again, i noticed the spring inside came down and went back up after cooling down. so im guessing its working now. Also the seal around the thermostat is black and doesn't look too thick. Arent all porsche seals orange?

 

I would bet it the T-stat in the wheel well as Don suggested. Mine when bad and I repolaced it. Well, the new did the same thing. Bought a third one and it worked.

The seals are aluminum rings. you need to make the large caps are tightened enough, which is not easy, as you only have a slot to work with.

 

I bought new inserts for my right rear wheel thermo and new aluminum caps also. I cut the slots all the way across instead of the half moon slot that was standard on the new ones. It gave me a lot more torque to apply. If you can get the thermo apart then you can leave the inserts out while you try out the car to see if the oil is flowing freely to the cooler. If the lines to and from the cooler do not get warm/hot then you have another problem ie; blockage or a crimped line somewhere. Remember there are two inserts in the thermo, heat and pressure. If you want to test them out individually you can remove only one at a time to see if they are responding correctly. My advice is to get a new thermo from MOCAL to replace the entire OEM unit if it needs replacing. It's half the price and a moderen direct bolt in unit.

 

well I thought my problem was fixed but it isn't. The thermostat either keeps getting stuck closed or open or I dont know what. Ran the car tonight for awhile. The car ran ALOT cooler at first. Then after driving it for about 20 minutes the temp got right up there again and started smoking. Brought it home and saw oil oozing out of the sides of the thermostat. There was a thin metal gasket between the thermostat and engine, should that be there?

 

also where can I buy the mocal thermo?

 

You can get one at a lot of places..

http://www.batinc.net/main.htm

Have you checked you rear wheel thermostat?

 

i checked, my car doesnt have that(?) just lines running from the oil cooler to the back. Is it possible for the car to run without it? Maybe Im just blind

 

The above pic is taken in the right hand rear wheel arch in front of the wheel (behind the door latch for the door).

If it is missing maybe someone has fitted a aftermarket somewhere else, follow the tubes.

 

just a thought...I dont mean to insult you but you mentioned you are a relatively new owner. In 1992 I remember making a very simple and common mistake (or, so I've heard). As a new owner of a 85 930, I checked and filled my oil like any other car-not running and cold. Do you check your oil level while the car is running and warmed up? If not, you need to...drain some oil before you do.

I recall some of the same symptoms you mentioned but it has been awhile...

Hope this is your problem. (I'd like to insert a smiley face here but don't know how).

Alex

 

Mike:

I live in Concord, could probably make it out to your house, or you could swing by mine, and we could look at it.

I think your oil level just may be low. Low oil volumes can cause much (relative term) higher temps.

Brian