It has been a while. Overdue for an update. I am still about but not nearly as active on forum as once was. Still trucking along though and checking in here from time to time. Clicked over 130,000 km on the engine since transplant to the 110. 30 thou km since last update.
Latest change is I have taken out the viscous fan and put in electric cooling fans. Picked up a few lost ponies along the way and the ability to rev very freely throughout the range is now very appreciated. I had no idea the viscous fan consumed so much horse power and placed rev range limits prior to taking it out. Fuel consumption has appeared to decrease slightly but too early to have anything other than anecdotal evidence. A few more long trips and I'll be able to place a number here sometime.
I used a Davies Craig Electronic Thermal Switch number 0444 seen
here set to come on at 87 deg C.
The thermostat in the engine is recently new ex-Japan and was tested by me to be fully open at 82-3 deg C. Once activated, the controller turns the first fan on, and then ten seconds later the other fan starts. Each fan draws approx 11 amps once started. Surge amperage is unknown. The fan switch stays on until temperatures seen by the system probe embedded in the top radiator pipe decreases by 5 deg C (theoretically back to fully open temperature). I have used a twin-thermofan set up from a car widely available here in NZ. The Ford Falcon AU2 (
googled here). NZD40 for a complete setup and the fan shroud is an exact match to the land rover radiator. Just had to make a supporting framework to hold the fans and shroud. They were not heavy but the mass moving about on rough country I needed to brace it against vehicle not radiator.
I have built in a wiring redundancy so if the controller faults out I can move a couple of fuses and reconnect a wire thus isolating the faulty controller and then enabling me to manually control the twin fans to cool the truck. While in 'auto' mode though I still have a manual turn on and off. The "manual-on" is good for cooling the truck if it gets hot (but not hot enough to activate automatically) prior to turning the motor off. The "manual-off" I have used to turn the fans off when starting the truck up again after a brief stop where the temperature has crept up to activation levels. The ability to turn off in this situation saves amperage for pre-heating and starting. Once the water pump is circulating again, the temperature drop away quickly and I switch back to auto control. i also use "manual-off" for when crossing deep water. This is great. When I had the viscous fan on in deep water, everything got very wet and the stresses on the fan blades was high enough to make me worry about radiator damage at times.
I have done a few long trips with this with the truck all fully loaded up and the route included hills and long straights etc. I have also commuted to work daily over hills and a 60 km round trip and the system has performed well. The thermostat allows for ram air cooling in a vast majority of distance so far. Thermo-fans kick in periodically when slugging up hills or in slow-mo 4x4 mode. All in all a great change. The summer is just around the corner and a long road trip is planned so I hope all continues rolling as it has done so far.
Cheers
Good roads lead to bad fishing.
. I replaced the old 7.50/16 tyres with 235/85 16 radials on wider rims and thus introduced more rolling friction 
. Prefer the old measure 750/16s but they're getting harder and more expensive to find. I took the flatbed off and mounted an all aluminum well side deck and this allowed me to put a roll over protection bar in over the cab. This lightened the truck by some 200kg in total.