Engine - Td5 (Description): Description and operation (page 4 of 7)

Oil cooler

1 Front oil gallery – full-flow filter to oil cooler matrix 2 Full-flow filter adaptor outlet port to oil cooler (open at >74° C) 3 Full-flow filter inlet port 4 Oil cooler housing 5 Full-flow filter outlet port to cylinder block 6 Coolant inlet port 7 Oil cooler banjo bolt seals (2 off) 8 Banjo bolts (2 off) 9 Banjo bolt oil holes – to oil cooler matrix 10 Rear oil gallery – full-flow filter/oil cooler outlet to cylinder block

11 Centre oil gallery – from pump to full-flow filter 12 Inlet port to centrifuge filter 13 Sealing ring – centrifuge filter housing to oil cooler housing 14 Port – oil cooler matrix 15 Oil cooler matrix 16 Inlet port from pump via cylinder block to oil cooler housing 17 Outlet port from oil cooler housing to cylinder block 18 Rear view of oil cooler housing

The engine oil cooler assembly is located on the left hand side of the engine block behind the oil centrifuge and oil filter. The housing is bolted to the engine block by seven bolts. A matrix is included in the oil cooler housing which acts as a heat exchanger. Coolant flow circulates through the oil cooler housing under pressure from the coolant pump and distributes the flow evenly around the matrix fins and then along the block into three core holes for cylinder cooling. Coolant enters the oil cooler through a pipe with a rubber hose extension at the rear side of the engine. The coolant hose is attached to the stub pipe of the oil cooler by a spring clip.

Oil drawn from the sump by the oil pump passes through the oil cooler via the cylinder block. The flow of coolant around the exterior surface of the oil cooler matrix cools a proportion of the engine oil flow as it passes through the oil cooler matrix.

The oil cooler is sealed to the cylinder block by a gasket which must be replaced every time the oil cooler housing is removed.