Another TDi conversion write-up for you
Series III 300 Tdi Conversion
You Should note the following statements at the end:
"the 300 Tdi into a Series Land Rover (Series II, IIA, III) requires the following:
1. Coil sprung chassis. We do not install the 300 Tdi 5 speed into a leaf sprung chassis for many reasons. Some (but not all) being:
-Axle strength. The Series axles won't stand up to Tdi torque. The Defender axles in the coil chassis will.
-Steering. The Tdi requires PS. This is much easier on a coil chassis than a leaf chassis, although it can be fitted as a separate system on a leaf sprung Rover.
-Brakes. The coil chassis have 4 wheel disc brakes, while the Series Rovers have 10" drum brakes (88"). We don't feel these vintage drum brakes are up the the power and speed that the Tdi can put out, so we require the 4 wheel discs.
-Clearance above the front diff. The added clearance of the coil chassis is needed to clear the Tdi's engine placement.
2. Power Steering. The location of the turbo on the 300 Tdi makes it impossible to fit a stock Series steering box. PS must be fitted.
3. Body work. A Rover with Series III or "late" Series IIA front bodywork can have a Tdi fitted. The early Series IIA bodywork (pre-1968) can not. The headlights in the grill take up space needed for the radiator and intercooler. See the engine bay images above to see how tight things really are.
However, if you were to fit Defender style front bodywork to your Series Rover (Series II,IIA,III), the conversion would be much easier and could be done at reduced cost. The other required items still apply, but the Defender front body work reduces the custom work by about half.
4. Gearbox. The 5 speed gearbox must be fitted for the Tdi. The torque of the Tdi would break the stock Series gearbox.