Timing chain cover bolts
The Timing cover has three M6 torx-head bolts that go down through the cylinder head into the top edge of the timing chain cover. I was refitting the cover and following the tightening procedure in the Bentley workshop manual. It said tighten the M7 bolts to 15Nm. Without checking I assumed that the bolts were M7 and set my torque wrench to 15Nm. As I started to tighten the bolts it was odd that the bolts kept turning without the wrench reaching it's clicking point. At first I thought it was just the new gasket compressing when suddenly one of the bolts gave way and went loose. TBH I thought I'd snapped the bolt and was amazed that when I removed the bolt it came out complete albeit stretched by a few mm. The correct tighten torque for M6 bolts is 9-10 Nm and I'm still surprised that these bolts would stretch to the point of fracture before only 15Nm.