[boum]

I have a 2010 CRDi that definitely has a blown head gasket. I am at the stage of removing the timing chain cover but I can't get it to pop off. I have all the bolts out including the ones to the sump and plenty of movement but it always seems to spring back into place after getting out about 10mm. Do I need to remove the cover off the fuel pump and disconnect something? Is there a dowel pin down the bottom somewhere?