TO DATE there has been no problems with this Discovery 2’s coolant system: no tell-tale pink staining around the pump which would indicate coolant leakage (Td5 engines use orange-pink OAT antifreeze). There have not been any cooling problems either, with the temperature gauge thankfully standing dead centre at all times. However, with the engine sitting in a rolling chassis, with no bodywork in the way, access is excellent – there is no better opportunity to carry out some renewal and upgrades.
The water pump is driven off the back of the power steering pump by a keyed wheel arrangement. This interface between the water pump and power steering pump will wear over time – a notch will form in the drive on the water pump, which can eventually result in outright failure. Other ways in which an old water pump can fail include the seal between the water pump and the cover leaking, the seal between the water pump and the drive housing failing and the bearing within the pump itself can fail. Should the seal fail, there is a weep hole in the water pump housing that allows coolant to escape (hence the aforementioned pink staining).
This spring type hose clip is moved using a set of special hose clip pliers, so that the hose can be removed from the water pump.
The turbocharger is fixed to the exhaust manifold by three studs and M8 flange nuts. Here one of the nuts is loosened with 13 mm spanner.
The spin-on oil filter needs to be moved out of the way (or replaced at the prescribed oil change). These oil filter pliers make short work of removal.
The seal may need to be broken by inserting a small screwdriver between the hose and the water pump, before the hose can be pulled clear.
The oil feed and return, attached at the top and bottom of the turbo, need to be detached. Here, a 14 mm socket wrench loosens the banjo bolt.
The air con compressor needs to be detached and can be set to one side with the hoses still attached, although this one is not connected.
The heat shield over the turbocharger needs to be removed by releasing this bolt and two attachment points at the side of the engine.
On this particular project, the turbocharger is going to be replaced with a new one, so it has been fully removed from the engine.
The centrifugal oil filter housing obstructs the water pump change and is unbolted from the engine block by removing three bolts (10 mm socket).
The turbocharger can remain attached to the exhaust downpipe and simply tied back out of the way, using a stout cable tie or similar.