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3.4 - Water Pump ( )

It is recommended that hoses be replaced after 5 years service, to avoid risk of failure on the road which could leave you stranded.

With typical bad fortune, the hose most likely to fail is the hardest to access. It runs backward from the water pump alongside the engine to the steel engine water rail pipe and is subject to the surges in pressure which accompany sudden increases in engine speed, for example on kickdown.

Replacement of this hose and the water pump inlet hose, which also links the thermostat block, inlet manifold heater, interior heater, header tank ( and intercooler circuit on XJR models ) requires removal of the inlet manifold, following the instructions above.

Hence it is recommended that both are replaced together, along with the inlet manifold heater hose which is the small hose running from the thermostat block to the throttle body.

When refitting, note the performed curve in the water rail hose and ensure it is correctly oriented such that the hose fits correctly onto the outlets.


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