Engine fire due to oil leak

Hello Elchfriends!!! Don’t find the right topic where I can explain my problem!! My first contribution here…. has a V40 Bj. 01 100kw! on my yesterday’s ride I noticed strong smoke coming out of the engine compartment! I stopped immediately and looked, when the bonnet opened I hit flames, could immediately delete with snow and everything went well! In the troubleshooting we then found out the engine oil kicked out and ran on the cracker, and had ignited! It has itself lower sheet metal, which is at the rear aggas outlet of the cylinders (so the cracker of the two engine and cockpit is located), a kind of stopper, rubber seal (round) loosened and oil could then run on the cracker. I mean the sheet where a hose is attached, the preheated air transports to the air filter. can tell me someone like this stopper, seal or what this means for a thing and looks like? It is not a screw that can be screwed into the engine block, there is no help me in the threadjo!