Hi Forum members and readers.
I thought I would post this topic to assist with other frustrated owners of a Holden Cruze Diesel.

I own a 2010 Cruze 2.0L SOHC Diesel and have been having issues with the vehicle just out of warranty. (6months and 5,000ks outside of warranty) Apart from random stalling while driving, the new issue is now the timing belt tracking or rubbing.
The timing belt was changed just on 91,000km which is 1,000 outside of the service schedule, so not too bad.
The new belt only lasted 15,000km before it started making a loud noise. Upon inspection it was noticed that the belt was tracking and rubbing inwards -towards the engine.
The belt was changed and so were all the pulleys and tensioners. The second round did exactly the same thing and continued to track inwards.
Thankfully the engine was stopped in time before any damage could occur (breakage to the belt or full failure etc)
I was on my third timing belt kit thinking that it was some kind of tracking issue with the tensioner pulley.
Upon closer inspection I noticed that the Crankshaft Sprocket had failed and the rear guide had sheered off the back. It wasn't easily noticeable because the rear guide ring was pushed back towards the bearing seal and didn't look like it was suppose to be there to begin with.
I have since removed the main crank pulley and will purchase a new one. Upon inspection the rear guide ring is poorly connected to the sprocket. The front guide is machined or molded as part of the sprocket. The back ring looks like an afterthought and looks incredibly weak. Its just a flimsy ring spot welded to the back. Why It couldn't be molded like the front of the sprocket is beyond me!

I can't understand why it failed. The first belt was changed by a qualified mechanic (Not Holden though) but the tension was just right. I checked when I had to open it up from the first failure. The subsequent tensioners were also correctly set and installed correctly to specification.

Hopefully this helps other with the same issues.

Thanks