Right then lads, the Bosch LDA equipped pump fitted to the 70ps turbo models of the 2.5di, (non UK market, might be non EU), is Bosch part number 0 460 414 154, this equates to Ford part number 964T9A543AA and Ford confirm this to be fitted to a turbo di Transit, 1996-7 model.
Using the parts breakdown of this pump and the 0 460 414 145 pump fitted to the N/A models, we can see what the Bosch engineers altered for the turbo version. This would be a good starting point for any Bosch equipped 2.5di/tdi.
1) The pump is fitted with an LDA top, this needs to have a 'clockwise throttle operation', this will enable the existing N/A throttle control lever and spring assembly to be used, thus allowing you to connect your throttle cable without modifications to the linkages. The LDA top case is not available as a spare part from Bosch, so the only source is a pre-used unit. There are a few VE pumps commonly available in the UK that have 'clockwise throttle', many MAN commercials, (mid 1990's), use these but the only real option you have in the light vehicle field is the 1.4/1.7/1.9 Fiat diesels. I believe that 'Maltese Falcon' has used one of these. If you source a pre-used LDA top, it will come with the internals, some of these may need to be changed dependent on the pump that you acquire the LDA from. We will leave the internals of the LDA for a later time.
2) The Timing Device Piston, (advance unit), has a part number of 1 463 104 622 and is different to the one in the N/A pump, this does make some sense as the timing always has to be altered when fitting the N/A pump to a turbo di. This part is fitted in VE pumps fitted to some of these engines; MAN, Ford 3.9 Cargo and some Cummins engines, however these pumps are unlikely to be found at the right price so the part is best purchased from Bosch as a spare.
3) One of the two compression springs on top of the Timing Device Piston is also different, the smaller diameter one. Again, purchase from Bosch, part number 1 464 616 956, or search for a VW 1.9d pump and hope the spring is in good condition. The larger diameter spring is the same as the N/A pump.
4) The Screw Plug, in the center of the Fuel Head is changed, this is available in many VE pumps but it is probably easier to purchase a replacement, Bosch part number 2 463 452 001 will do for this.
5) The Cam Plate is changed for the turbo application, Bosch part number 2 466 110 125 is required. This part can be found in a number of pumps available in the UK, 0 460 414 993 fitted to a Renault 1.9dti engine, or 0 460 414 194/984/991/997, all fitted to 200tdi Land Rover engines. Fitting this part will require a complete pump strip down but is one of the alterations likely to have the most effect!
6) The Part Load Governor Assembly is different from that used in the N/A pump, this will need to be purchased from Bosch, part number 1 463 163 274, as it is specific to the turbo pump!
7) The Fulcrum Lever, this is the part that the Part Load Governor connects to is also specific to the turbo pump. Bosch part number 1 461 907 182 is required.
The Control Valve is changed, Bosch part number 1 460 362 477 is required. Pump numbers 0 460 424 125/137/139/141/145/146/147/148/152 all contain this part. These pumps can be found on 2.8tdi Iveco and Renault vans.
9) The banjo bolt used to connect the fuel return line to the pump is changed from that used on the N/A variant. This contains a 'fuel restricter', part number 1 463 456 344 is required. This can be found on Iveco/Renault 2.8tdi pumps as above, 0 460 424 125 being an example.
10) Similar to above, the fitting into which the banjo bolt fits is changed, this is part of the fuel restricter, Bosch part number 1 463 457 312 is required. Again, the 0 460 424 125 pump should provide this part.
The only other thing that you need to do is to blank off the external fuel supply at the base of the pump as the LDA does not require this.
The above may seem like a lot of work, but it is only 10 different parts in a pump that has over 200 individual components, and bare in mind that Bosch bothered to change them for a reason.
Given the chance of a Bosch factory turbo pump, we would all be fitting these along with our turbos, but as they were never fitted to UK specification Transits, we have to make our own
.
)
