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  • Scotts Diesel conversion

    picked this prado up for $2700 unlic,bald tires,was told it had a blown head gasket, looking very ratty from sitting under a pine tree for a year !

    decided about a week after i got my 90 that the V6 was destined to be a boat anchor ! LOL
    always wanted to do a D4D auto and actualy had a complete motor that had thrown a rod thinking i could just replace the block however the head was completly screwed aswell! not long after a bargain 1kz poped up from a ex mine 90 snapped it up an so it began , the search for the restr of the parts ! wiring, PS hoses ECU Auto box,
    the motor come with a heap of other stuff that i needed

    the whole of aus at the time i couldnt find a auto diesel harness , i was at a local wrecker getting some other bits when i come across a 120 1KZ auto withthe full drive line still in it with the wiring! 500 for all the wiring and ECUs 750 for the auto and transfer case with very few Ks on it

    so the conversion ! well a LOT of ppl are scared of conversions ! if you dont know what your doing then they can be a EXPENCIVE night mare
    i started stripping all the engine wires from the 120s main harness this took a fair amout of time looking over 120 and 90 wiring diagrams i was left with a pretty tiny harness witha few plugs on it

    then the time come to to the mechanicals
    engine out new one in was pretty straight foward HOWEVER the bellhousing on a diesel is longer than a petrol due to a much larger torque converter and flywheel this pushed the transfer further to the rear luckily the diesel trasfer i have is shorter it is a electronic center diff lock type maybe thats why but th9is made the drive shafts line up pretty much in the same spot as V6 !!! sweeeeet BUUT the cross member is in the wrong possition details later
    all the mechanicals are done fuel lines reused ,fuel pumps removed and replaced with a fiter pick up D4D fuel filter used
    diesel p/s lines fitted
    everything just bolted up as normal i am using my original V6 airbox so a custom intake was made i went this way as there were too mant things to move otherwise

    now for the wiring ! bassicly started off loosly setting the tails out around the cab . its not as big as what some ppl think diesel and petrol use a lot of the same wires ;relays power feeds, sensors so it was just a matter of looking at wiring diagrams finding matching and joining the 2 harnesses together
    the 90 imobiliser wont talk to the 120 ECU so i had to get a new 120 imob and key and wire that in
    well with the bassic wiring done it started up straight away !
    3 full days later all the wiring was finished wrapped up and tucked away !
    Click image for larger version

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  • #2
    The throttle pedal had to be changed and modded to fit a 120 flyby wire type
    diesel instrument cluster fitted ... had to change the plugs on that
    extra fuel change over solenoid fitted
    all new oil seals ,water pump, timing belt , tensioner , all toyota gen parts
    over all its been a great conversion ! fuel economy so far is 600 to my main tank and about 500 to sub... this was the fist tanks so next time could be different
    power is great ! and actually feels not too much less that the V6 economy is soo much better
    not sure if the 120 ECU uses less fuel than a 90 ECU but it is very nice to drive

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    • #3
      ok, now you have my attention lol

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      • #4
        More pics to come .... Not a lot of the engine in an out but that's just a normal swap

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        • #5
          Well done on the conversion.
          I'm sure there will be a few interested in this conversion.

          Regards, Jason.

          Comment


          • #6
            Originally posted by scottkz View Post
            More pics to come .... Not a lot of the engine in an out but that's just a normal swap
            Click image for larger version

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            Well 8000ks on my conversion already!!! Not one single problem!
            This is the custom gearbox crossmember it's just 2 cross-members joined together with the middle of one cut out
            Shits all over the V6 for towing
            Only place it lacked power was going up a 2k long hill on the bitumen
            Been on very boggy beach with the camper didn't even feel like is was going to bog down or loose power
            My previous 4wd was a 4runner that I also converted to 1KZ auto.... Great car go anywhere but wow the 1KZs in the prados are light years ahead
            Of the old surfs

            I'd love to put a D4D auto in it but a package is just stupidly expensive !

            Comment


            • #7
              So Iv been a bit busy with the 90 in the last few weeks,
              Added dual airbags , ABS , TRC , Climate control , painted all the flares body colour
              Put a factory wood grain kit dash kit in it
              It had been off the road for 5 weeks as I had a failed transfercase ,
              ABS/TRC isn't functioning yet as I'm still needing to swap the whole rear axle over to ABS type

              It's part time 4wd now , amazed how good it goes in 2wd off road ! Only needed it on boggy beach
              Attached Files

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              • #8
                Hi Scott. Do yo have more info on the the part time mods / kit?
                95 3.0 Camp Car, 150 V6 Daily Driver[SIZE=4]
                [/SIZE]

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                • #9
                  Its a "af3am" type transfercase
                  Fitted to the high spec 185 surfs pretty easy to wire up but you do need the 4wd ecu that goes with it
                  I picked mine up for 150$
                  You need to also get the adaptor that hoes between the auto and case (every prado has one) but has to be specific to the multimode one
                  Selector lever from the surf is correct positioning
                  If your looking for better fuel economy I wouldnt bother as I barely noticed any difference

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                  • #10
                    Thanks, I won't bother with it then.
                    95 3.0 Camp Car, 150 V6 Daily Driver[SIZE=4]
                    [/SIZE]

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                    • #11
                      yeah id like to put the surf front diff in as it disconects one cv shaft and stops the diff center and front shaft spinning . I believe that would give better economy but the cheapest one in perth iv found is 500$ and im just not going to spend that on one
                      If you found a blown 185 surf front diff you could judt change the ADD part onto the prado diff

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                      • #12
                        Ok.. thread dig time. Whats involved for the climate control swap?

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                        • #13
                          Full new wiring harness.... heater/mix box, fan box , unless you can find one from a early jap spec one there only in series 2s so that means youl also need instrument cluster ecu engine wiring
                          If you were keen you could unpick the climate control wiring from a series 2 harness
                          Unless you found it all dirt cheap I wouldnt worry , I know what the wreckers want for harnesses!
                          Series 1 rear wiring wont plug into series 2 front wiring

                          Comment

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