Hi everyone
We have replaced the timing chain, balance shaft, guides, tensioner, cam position plates etc. Due to the teeth on the balance shaft stripping. Ever since there is a rattle on start up when the engine has been standing for a while. It sounds like a slack chain and disappeares when the oil pressure kicks in. We have checked the chain and tensioner when cold and they are perfect. The noise seems to be a vvt cam sprocket but they were ok before the job and no fault codes are stored. It has done about 300 miles since the job and apart from the noise it's perfect.
Thanks for reading
Allan