Injection Pump Timing: I-Mark

1985 Isuzu I-Mark 2D Hatchback, StandardSECTION I-Mark
  1. Check that notch in pump flange is in line with notched line on front plate. Set No. 1 cylinder at TDC of compression stroke. Remove injection pump pulley cover (upper front cover). Ensure timing marks are aligned. See Figure .
  2. Remove valve cover and rear plug. Check that fixing plate fits smoothly into slit at rear end of camshaft, then remove fixing plate. See Figure . Disconnect injection pipe from pump (using back-up wrench) and remove fuel distributor head screw.
  3. Install Timing Gauge Tool (J-28827). See Fig 1 . Set lift approximately .04" (1 mm) from plunger. Turn engine until No. 1 cylinder is 45-60° BTDC, then set dial indicator to zero.
    Fig 1: Adjusting I-Mark Injection Pump Timing
    G34645
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.