ENGINE – TD 12-1-14 DESCRIPTION AND OPERATION Lubrication Circuit 1 Pressure supply to upper chain lubrication 2 Camshaft bearing 3 Runout stop – Hydraulic Valve Adjuster gallery 4 Hydraulic valve lash adjuster gallery (HVA) 5 Piston spray nozzle — hook-type nozzle 6 Cylinder block main oil gallery feed for crankshaft bearings 7 Oil filter with oil cooler 8 Oil gallery after oil filter — main oil gallery 9 Oil intake pipe 10 Unfiltered oil duct 11 Oil pump 12 Pressure supply for upper chain lubrication 13 Pressure supply to Turbo-charger 14 Riser to cylinder head 15 Pressure supply to vacuum pump Operation Oil from the sump is drawn up through a fabricated metal pickup pipe which contains a mesh to filter out any relatively large pieces of material which could cause damage to the oil pump. The head of the pickup is centrally immersed in the sump oil which is delivered to the inlet side of the eccentric rotary pump. The oil pump is driven from the crankshaft by a chain and sprocket system. Pressurised oil from the pump is passed through a port in the bottom of the cylinder block and is directed up to the oil inlet port of the oil cooler and filter housing via a port in the RH side of the cylinder block. The oil pump contains an oil pressure relief valve which opens to allow oil to be recirculated back around the pump if the oil pressure increases to a high enough level.