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Static Timing

  1. Remove center screw plug and copper washer located between 4 high pressure fuel outlets on rear of injection pump. Install Dial Indicator Support (Mot. 856) in place of screw plug. Insert dial indicator tip into support.
  2. Loosen control cable screw at injection pump and turn control cable clevis pin 1/4 turn to disengage cold start system control. Rotate crankshaft clockwise (viewed from front of engine) 1 1/2 turns. Dial indicator pointer will stop moving when injection pump piston is at BDC.
  3. With pump piston at BDC, zero dial indicator. Remove screw plug from TDC access hole in cylinder block, and install TDC Rod (Mot. 861). See Fig 2 . Slowly rotate crankshaft clockwise, until TDC rod can be inserted into TDC hole in crankshaft counterweight.
    Fig 1: Locking Crankshaft at TDC
    G50D11729Courtesy of AMERICAN MOTORS/JEEP CORP.
    Fig 2: Installing TDC Rod
    G11868Courtesy of AMERICAN MOTORS/JEEP CORP.
  4. With TDC rod in hole, dial indicator should read .031-.033" (.79-.84 mm). If fuel injection pump piston lift travel distance is not correct, pump piston must be adjusted.
  5. To adjust pump piston, loosen pump adjustment bolts. Observe dial indicator. To increase piston lift, rotate pump toward engine and then away from engine. To decrease piston lift, rotate pump away from engine.
    NOTE: Always adjust piston by rotating pump away from engine. This is normal direction of pump rotation. When increasing piston lift, rotate pump toward engine until piston lift is greater than specified tolerance and then rotate pump away from engine until correct piston lift is indicated on dial indicator.
  6. Tighten injection pump adjustment bolts. Remove TDC rod from crankshaft counterweight. Observe dial indicator and rotate crankshaft clockwise 2 complete revolutions until TDC rod can be inserted into crankshaft counterweight TDC slot.
  7. Dial indicator pointer should return to zero and then move to .031-.033" (.79-.84 mm). This will indicate that fuel injection pump static timing is correct. Remove TDC rod from crankshaft counterweight and install plug in cylinder block.
  8. Remove dial indicator and support. Install washer and screw plug in fuel injection pump. Compress timing control lever and install clevis pin in its original position. With lever against clevis, tightening screw.
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