This kit sets the valve timing on the dw10 and dw12 diesel fiat and psa peugeot amp citroen ranges specifically manufactured for use on twin cam systems with one camshaft driven by the cambelt and the other shaft driven by the chain in the head this essential service kit is compatible with 2 litre sohc and dohc diesel engines dw10 and 22 litre diesel engines dw12for full details please refer to the product manual