18 General Information Components The Volvo D12 engine serial number is lo- cated on the rear, left side of the cylinder block. There is also a label on the engine elec- tronic control unit that shows the engine serial number. W0001529 The Volvo D7 engine serial number is lo- cated on the rear, left side of the cylinder block. There is also a label on the rear valve cover that shows the engine serial number. W2002707