While you're changing the water pump have a real good look at the P gasket. Failure of the original paper gasket (and subsequent coolant loss) is arguably the greatest cause of overheating and failed cylinder heads in the 300 TDi.
Roverlord on this forum supplies quality spare parts very promptly
As someone mentioned earlier don't fall into the trap of fitting larger diameter tyres. The 300 TDi is hardly a power house and when loaded can struggle, larger diameter tyres will only make this worse. The Defender already has a lower ratio high range than the 300 TDi Disco to allow it to run comparatively larger diameter tyres/wheels.
Deano.
66 SIIA SWB .......73 SIII LWB diesel wgn
86 RR 'classic'......99 Range Rover P38a
94 Defender 110..95 Defender 130 Ute
96 D1 300TDi.......99 D2 TD5 (current)
04 D2a Td5..........02 Disco 2 V8
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