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After my drive, I examined the underside of the car, and this is what I found:

1. A very small line of oil on one of the longitudinal bosses at the bottom of the transaxle, likely dribbled down from above. I wiped it all, but could have missed this much after the trans top-up. I did notice a small gleam of oil peeking out of the fill plug threads.

2. Quite a bit of oil coming from the front of the engine (rear of car) dripping down from above. This oil travels to the lowest point of the engine case, then is swept back onto the muffler, which creates quite a stink and residue.

3. Quite a bit of oil on the front side of the black 90 degree air pipe coming out of the driver's side heat exchanger. Can't yet tell where this oil is coming from. Oil also on the turbo oil catch can which is right next to that air pipe.

I'll see if I can put a rag in the bellhousing as suggested by CFD

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1986 930, Garnet Red Metallic
Previous P's:
65 911, 66 911S
63 904 (086), 63 904 (038)
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Old 06-21-2013, 09:19 AM
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No rag will fit, due to the flywheel/clutch being there, but I did snake a 6 inch Q-tip down there far enough, I think, to detect any pooled oil in the bottom of the housing. Nothing but normal dirt.

So that's not where the oil is going.
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1986 930, Garnet Red Metallic
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63 904 (086), 63 904 (038)
70 914-6
Old 06-21-2013, 09:51 AM
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Here is a pic of the areas that have initially become oily after cleaning up the underside and going for a 20 mile drive:




And here are two pictures to satisfy Krasusky!

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1986 930, Garnet Red Metallic
Previous P's:
65 911, 66 911S
63 904 (086), 63 904 (038)
70 914-6
Old 06-21-2013, 11:46 AM
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UDAMAN, Tom! Thanks! Trio lookin GUUUUUUUUUUD!!!

SWAG here, but chain covers for the left circle, and maybe turbo seals or oil line junction for the right circle (or oil return tube, or a cyl leak)

try tightening some of the hardware - I went thru mine the other night (basically everything I could get a tool on) and definitely found some in need of torque
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Paul... CT | '87 930 | '08 M3 6gang vert |
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Old 06-21-2013, 11:55 AM
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Paul:

What do you do, sit at your computer all day and wait for someone to post? Your returns are FAST!

I almost think that the oil for the right hand circle area could be coming from the rearmost access hole in the heat exchanger. I did not see excess oil inside the hole, but the circular tube end where it fits to the bottom of the HE had oil around it, almost like oil was coming out from inside the HE. I would not expect that!
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1986 930, Garnet Red Metallic
Previous P's:
65 911, 66 911S
63 904 (086), 63 904 (038)
70 914-6
Old 06-21-2013, 12:45 PM
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lol naaa just happen to be on - see this one took me a whole 50min!

rear most access hole in the H/E... check the oil pump line fitting, and try tightening
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Paul... CT | '87 930 | '08 M3 6gang vert |
past:

| '07 S6 | '98 M3 vert | '01 M5 | '96 993 C2 cab | '05 S600 Sport - biturbo V12@Just Not Right 495rwhp / 612rwtq |
| '58 TR3A | '01 S8 | '95 S6 6gang | '88 M5 | '87 190E 2.3-16 |
Old 06-21-2013, 01:34 PM
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Quote:
Originally Posted by Telerding View Post
I almost think that the oil for the right hand circle area could be coming from the rearmost access hole in the heat exchanger. I did not see excess oil inside the hole, but the circular tube end where it fits to the bottom of the HE had oil around it, almost like oil was coming out from inside the HE. I would not expect that!
I had a LOAD of oil INSIDE my heat exchanger as well when I was emptying my gearbox oil out through the vent, so I am not entirely surprised if there is oil inside the heat exchanger. In my case the reason for this was the front end of the exchanger getting liberally coated with oil and the flexi tube up to the heater flap from the exchanger wasn't a good fit. When I had then engine out and looked into the exchanger at the flywheel end I could see a pool of oil in it. I soaked as much out with a rag and a number of Italian tune-ups took care of the remaining oil.

However, at this point I wouldn't be unduly concerned with any oil leaks on the engine - what's critical here is to establish where the gearbox oil is going. Certainly it's no harm to eliminate them for sure as it will reduce the amount of oil on the engine and possibly help with tracing the gearbox oil.

The oil on the fill plug threads.....was this fresh/wet looking oil? Very unlikely it's coming out this taper thread plug though if this is any way tight...takes very little to have it tight. But worth a careful clean and check after a drive again.

That line of oil you saw along the longtitudinal boss of the transaxle - this is on the casing of the gearbox right? Different terminology so just checking....this is certainly a clue as oil will not come from the engine forward to the gearbox, so if this was clean prior to the drive then its worth cleaning, driving again and doing another check (and the fill plug threads) - remembering again the rate of loss from the gearbox - 0.5 qt / 2000 miles....it's a tedious job - I went through it with mine, replacing the driveshaft seals, taking it in and out twice etc.....
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Old 06-21-2013, 01:37 PM
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Krasusky:

Good idea to see if all nuts and connections are tight. I probably need a small(er) torque wrench, as both my torque wrenches are big.

I have the manuals, so I can find all of the torque specs necessary.

CFD:

I'll look inside the HEs since the car is on the rack.

Yes, the oil, it was just a small drop that caught the light, was fresh/wet looking. I am going to wipe everything again after I go thru the tightening loose items and go for a ride again.

Yes, the thin line of oil was on the bottom of the gearbox case.

I will report back after the drive.

Thanks guys!
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63 904 (086), 63 904 (038)
70 914-6
Old 06-21-2013, 02:53 PM
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Are you sure the oil on the engine case isn't the mysterious tranny fluid? Leaking trans fluid from the front seal will run down the parting line of the case.
Old 06-21-2013, 07:13 PM
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Tippy:

Will it run along the outside, or somewhere not visible?

In this case, I don't think that it was the trans fluid. But before I cleaned things up, it looked to me like the oil at the rear end was flowing from a section of the case split line about half way along the engine.

That was after about 1000 miles. I have only done 20 or so since the cleanup, so I wouldn't think that oil from the trans would travel that far yet.

I did wonder if there was any way for trans fluid to travel that far without being obvious. I mean ahead of where it looked like the oil was coming from the split, it was dry and clean.

I have fluorescent dye coming to use in the trans to help track where the oil is coming from.
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1986 930, Garnet Red Metallic
Previous P's:
65 911, 66 911S
63 904 (086), 63 904 (038)
70 914-6
Old 06-21-2013, 07:53 PM
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Sounds good. Interesting what shows up from your next drive.....

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Old 06-22-2013, 01:26 PM
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