Brand new to me 1986.5 928s. I’m in discovery mode here, and this is only my second “project car” (only really a project because aren’t all old cars constantly a project?)… Today I got the car lifted and noticed the oil on the radiator hose, but looks like it’s coming from the copper washer on the line just above it. Hoping it’s as simple as disconnecting, digging through my assortment of copper washers for a match, and reattaching. Anything else I should be looking for? I only ask because I feel like every time I do research on this car I learn to look for other things “while I’m in there.” Plan on this being my Saturday project, and I’m hoping it’s a simple one… those are the most satisfying.

 

go buy a 32 mm and 27 mm open end wrenches use them to break the oil line free of the adapter,
Spray the area with break cleaner,
then tighten the adapter, make it tight but dont use the full leverage of your wrench as you will rip it out of the cooler.
After this, then put some anti seize on the back of the connector bulb where the nut presses it,
and some on the threads,
then install the line and counterhold the adapter.
NOTE depending on how long that oil has been leaking on the coolant hose,
it might also be time to replace it as the oil will soften the coolant hose and it could slip off past the clamp or split.
Either way you will have a bad outcome as you will dump about 2.5 gallons of coolant

 

I will definitely consider replacing the hose, I’ll be in there for the belt change soon and I’ll just tackle a bunch of things while I’m in there.

SO just to be super clear (sorry if I sound like an idiot, I’m just a stickler for clarity)… I’m holding the copper adapter while taking the silver oil line off the adapter. Clean it with brake cleaner. Then I’m tightening the adapter/copper side with the same washer that’s already there, correct? I was thinking the washer was the issue, but you’re saying I’m really just tightening that down, yes?

and thanks again for your help… I already sense you’re the guy to trust on here :-)

 

that adapter screws into a cooler, so you need to be careful with it ,
NOTE it is an anchor point for the oil line.

based on your picture the adapter thats screwed into the cooler has come loose by a lil bit.
so the oil line needs to be taken apart,
then the adapter cleaned and screwed into the cooler so its tight,
then the line attached while you hold it with the 27 MM wrench.

NOTE it will be easier to work on this with the upper and lower fan shrouds removed

 

If when you get in there, you find that the adapter is actually tight, but it's still leaking, you may have a scratch or issue with the mating surface on the cooler or on the adapter. In cases like that, I've had excellent success with using a bonded sealing washer instead of a metal crush washer. Have used them on banjo bolts, oil drain plugs, etc.

Hilitchi 180-Pcs Metric Dowty...

 

Got the shrouds out of the way. Really no way of doing it otherwise since these are big wrenches… So the line that attaches was easy to loosen. The adapter seemed tight, but it may have also just been a little seized. So I just tried untightening it and it twisted immediately, so it couldn’t have been THAT tight… Anyway. I sprayed it nice and clean, tightened it, and I was able to get an extra turn or two in there… I didn’t want to push my luck any more than that, tighter is tighter. But now everything is nice a tidy and so next time I drive I can take a look again and hopefully easily see if it’s still leaking.

 

Thanks for this. As said in my other reply, I did manage to tighten it a little bit, but also didn’t want to over do it. If this doesn’t solve the problem, I’ll try your washers. I ordered them already and should be here tomorrow… Seem like they’re good to have whether I resort to them or not.

 

Just an update. To her out for a 25 mile drive and took a quick look underneath, and so far, no sign of a leak. I’ll keep an eye on it. Thanks for your guys’ help. I’m sure I’ll be back again soon with more questions :-)