This is sort-of-like a Haynes shop manual of the WVO conversion …

This is what the L400 looked like after I first pulled it into the shop and popped the hood.

When I was working on the engine I removed the intercooler, the battery and the air filter.  The intercooler has a number of electrical sensor lines attached to it, and these also have to be removed.  There is a lot more space in the engine compartment once these three items are removed …

I started by tracking down the fuel lines that I needed to tee into.  The fuel filter is located on the right hand side of the engine compartment tucked behind the coolant filler tank and windshield washer reservoir.  There are two lines going into the filter; the line from the tank (can be traced leaving the rear of the engine compartment) and the line to the injector pump (marked with red tape … can be followed to the injector pump mounted on the right hand side of the engine).

At the injector pump I located and marked the line running from the filter with red tape and marked the return line back to the fuel tank with green tape.  I then tracked down the coolant lines that I would need to tee into.  You want to locate the two coolant lines that are tee’d off of the engine block (rear right hand side).  The Delica vans all seem to come with two passenger compartment heaters; one for the front seat and one for the rear.  I used both sets of these lines for the WVO system; I tee’d the coolant lines for the WVO filter into the lines running to/from the front cabin heater core, and I tee’d the coolant lines for the in-tank heater into the lines running to/from the rear cabin heater.  The heater hose that runs to the front heater core has an orange (or red) rectangle painted on it at the factory.  You can follow this line back to where it passes through the wall into the passenger compartment.  The line that penetrates the wall beside it is the return line.  If memory serves correctly (so you should definitely check this one) the line with two orange (or red) rectangles painted on it is the coolant line running to the rear heater core and the identical line running beside it (under the van) is the return line.  These lines can be traced to the rear heater core located under the van below where the passenger behind the driver sits (remember this is a right hand drive vehicle).  The painted rectangles are visible in the picture attached to this paragraph.

With all of the fuel and coolant lines identified I picked a place to install the WVO filter.  The spot I came up with was on the left hand side of the engine compartment behind the air filter.  There is an empty space here and I was able to place the filter and valves at this spot without having to move anything else.  I made a right angle bracket to mount the PlantDrive filter and bolted it above the tire well using an existing brake line bracket bolt and I drilled a second bolt hole.  Once the bracket was in place I mounted the filter.

I mounted the electric valves used to switch between diesel and oil on an arm attached to the WVO filter body.  I bent a right angle bracket and attached the valves.  After installation I had to bend the bracket again so that the valves sat more towards the air filter assembly; this gave space for wiring and hoses.

I made a bracket and installed the in-line fuel heater (a vegtherm from www.plantdrive.ca) above and to the left of the engine.  Placing this heater was tricky; you do not want it in close proximity/touching anything that might melt or combust (fuel hose, electrical lines …) and there simply was not a lot of space for it.  My installation spot seems to work fine although you have to watch the wiper arms as they move in this location and watch the clearance of the heater to the hoses running into the inter-cooler. 

The remaining items I installed in the engine compartment were electrical; the circuit breaker for the in-line heater went slightly behind and to the right hand side of the battery and the relay for the in-line heater was mounted in a similar fashion to the heater bracket above and to the right hand side of the engine.

After that it was a matter of hooking up hoses and wires … I ran the hoses and wires along the back of the engine compartment below the arms that operate the wind shield wipers.  Electrical wiring passes through the engine compartment through a rubber gasket (gromet?) behind the diesel fuel filter.  I poked a hole in this gasket and ran the WVO electrical wires through there as well.

I have some more pictures but cannot find them right now.  If I track them down I will post these as well …