109 with a 4BT

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  • Roverlab
    Low Range
    • Feb 2009
    • 30

    109 with a 4BT

    Hi, all! Happy New Year! I currently have a 4BT powered 109 here that has transmission and transfer case issues, ie difficult, inconsistent shifting and the tcase pops out of high range after only a few miles. I've only started diagnosing the car but I can tell you that the oil in both boxes has an extremely high metal content!
    I haven't confirmed this, but I've been told the trans is a T18 and the tcase has an Ashcroft hi ratio fitted.
    Also, in my sort diagnostic drives, my left quadricep muscle has grown signifigantly.
    So, my first round of questions are: if we were to repair or replace this combination, is it proving reliable as the miles increase; is there another alternative; are short, heavy clutch throws part of the package?
    IS there another forum for more detailed discussions?
    Thanks!
    Trevor
    sigpic92 RRC, 94 DI, 06 LR3
  • yorker
    Overdrive
    • Nov 2006
    • 1635

    #2
    1965 SIIa 88",1975 Ex-MOD 109/Ambulance, 1989 RRC, blah, blah, blah...

    Land Rover UK Forums

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    • leafsprung
      Overdrive
      • Nov 2006
      • 1008

      #3
      The heavy clutch is probably because the mechanical advantage provided by the clutch tower, throwout arm and cylinders are insufficient - in other words its a design issue.n All of those factors can be changed to decrease pedal effort.

      Comment

      • gambrinus
        1st Gear
        • Jan 2007
        • 142

        #4
        That is a LOT of engine to stick in a 109... SWEET motor, but woooooo baby is it a big beast.

        Comment

        • disco2hse
          4th Gear
          • Jul 2010
          • 451

          #5
          Suggest you join aulro.com. There are a large number of those conversions on there.
          Alan

          109 Stage 1 V8 ex-army FFR
          2005 Disco 2 HSE

          http://www.youtube.com/user/alalit

          Comment

          • leafsprung
            Overdrive
            • Nov 2006
            • 1008

            #6
            mostly 4bd1(t) isuzu in oz not cummins 4bt

            Comment

            • slorocco
              2nd Gear
              • Feb 2007
              • 208

              #7
              Hey man, you've seen my junk. Same motor but I'm running an SM420 and LT230 behind the motor. Clutch pedal effort is about normal on my rig not excessive.

              I would second the recommendation to check the 4btswaps page to see/ask how well the T18 holds up behind the 4bt.

              Comment

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