Oil smoking on catalytic converter!!
I have an 86 XF auto, and just had my dead 3.3 changed over for a 4.1 a week or two ago, but on the drive home smelt a bit of smoke so popped the bonnet and there was oil over the inside (passenger side) of the catalytic converter and underneath it throwing off smoke. I assumed it was just some leftover oil from the old engine, but subsequently drove for Xmas from NSW Central West to Melbourne and every time I stopped there was smoke billowing out off the catalytic and to some extent along the exhaust pipe for about 2 or 3 feet back. The bottom of the car is generally oily too, more on the drivers side though.
In Melb I got a mechanic to check, and he had a quick look and thought it might be the rocker cover leaking, and as all the bolts were loose I had them tightened. It was probably my imagination but it did seem to make a difference, although I noticed that with city driving the problem didn't seem to reoccur anyhow, even though I drove for a hour or so at a time.
I've since driven back, and the problem showed up again, although it seems to be not so bad. On the drive there and back I had to add at least a litre of oil (1600km round trip roughly), and where that went I'm not sure. Could the engine be leaking oil from somewhere onto the converter? I've checked the block below the head and there are no leaks to speak of, and the engine and sump is pretty dry. The bell housing seems to be the area where the leak is occurring. There are some clean shiny areas where it looks like oil might have kept it clean.
To complicate this issue the engine blows blue smoke on start up when it is hot, so what that indicates I don't know, but I don't think all the oil consumption is due to rings etc.
I might have two issues here, but the oil on the converter is my main problem. If I have a big end bearing leak would that throw oil on the catalytic converter? If a big end issue is my problem I'm taking the car straight back to the guys who put the supposedly good engine in.
Apart from this issue and a bit of smoke on hot starts, the engine has run like a gem.
Last edited by XFer; 12-30-03 at 02:25 PM.
Reason: Added pic