julianps

Thanks for that - yes I was coming to see it as a baffle (the black part has pn 03E 115 303 A stamped on it). coming back to the question of why the lugs on the underside of the oil filler caps break, is whether the baffle should be rotated (and if so, to what degree) by those lugs. I still have the feeling somethings not quite right with the assembly.

Thank you for coming back to me on this topic. Here are three images on the engine. The first shows the layout of the components on top of the timing chain cover (from top to bottom; PCV, filler cap and inspection cover). The second photo shows the cap removed. I'm guessing that what I'm seeing in the filler neck are components of PCV system. The third photo shows the construction of the filler neck (i.e. how is clamps the filler cap plus (and this is very hard to see) a raised lip in the black plastic PCV componentry. |It appears that the lugs in picture #3 of my original post, engage against this, so that, as the filler cap is closed, the internal PCv commentary is made to rotate (against a spring?). But it doesn't move - it's fixed. In which case, why the lugs? For the moment, I surmise there's a problem with the PCV componentry - though maybe it's been locked in place to stop the engine breathing-in too much gunk and destroying the catalytic convertor.

I apologise in advance for some silly questions. Firstly, some details. My car is MY2012 5J/Fabia ll with a 1.2 51kW engine, coded CGPA, that is stylistically badged as an "HTP" version. On acquiring it I found the engine oil level to be below minimum. Intending a top-up, I could not remove the oil filler cap (I tried turning it and tried pressing down and turning it; it did not want to budge at all). So [being the ham-fisted gorilla that I am] I used a plumbers' wrench, which (after some crunching sounds) did turn it, and I removed it. Obviously, I had broken some gubbins on the underside of the filler cap. I have no idea what purpose the gubbins served, other than to break! After clearing the bits of broken plastic from inside the oil filler neck, I found the p/n of the broken filler cap to be 03C 103 485 C. One attached photo shows the 'triangular' lugs that I have now snapped-off mine. SKODA parts suppliers I contacted confirmed p/n 03C 103 485 C was replaced with p/n 06B 103 485 C - which apparently has different shaped lugs (see the other attached photo, that's for an after-market part). This new cap turns about 60 degrees before it's blocked, so won't close properly. (Weirdly, LLLParts.co.uk diagram of the replacement part (i.e. 06B) has the same 'triangular' lugs as the previous (i.e. 03C) part. See here for details of this. So, to the silly questions; 1/ how was I meant to open the original oil filler cap w/out breaking it? 2/ how should I fit the replacement filler cap, the one with different lugs, without also breaking that? 3/ is the square-lug design really the right, or actually the wrong, part for this engine? 4/ what is the purpose of these lugs, given the filler neck is a standard design? And while I'm at it; 5/ Why is it do hard to get new oil into the engine (i.e. what is the metal plate and the plastic block obstructing the filler neck)? Many thanks in advance for your enlightenment. Jules