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Steve Jensen
Steve Jensen, Ford Technician
Category: Ford
Satisfied Customers: 394
Experience:  Ford Senior Master Technician, ASE Master Technician 33 years experience
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how do you set timing in a 7.3 idi or is there a sequence

Resolved Question:

how do you set timing in a 7.3 idi or is there a sequence in timing like a gas motor
Submitted: 8 years ago.
Category: Ford
Expert:  Steve Jensen replied 8 years ago.

Setting the static injection timing simply involves aligning the mark on the cover with the mark on the pump housing, as in the diagram below. To properly set the dynamic (engine running) timing requires special equipment. I'll give you a copy of the procedure below. If you haven't done so, by far the best performance imporovement you can obtain it by adding a turbocharger to this engine. Steve




Setting Injection Timing-Dynamic Timing

Note: When checking or setting dynamic injection timing on the 7.3L engine it is mandatory that the engine be stabilized at normal operating temperature of 89°C-100°C (192°F-212°F). This temperature is needed to ensure proper fuel ignition in the precombustion chambers.

  1. Bring engine up to normal operating temperature.

Note: To prevent incorrect readings, ensure that vibration damper is clean and free of foreign debris and rust scale. If required, sand the area to remove rust and apply a light coat of paint to the area.

  1. Stop engine and install Dynamic Timing Meter, Rotunda 078-00200 or equivalent, by placing magnetic pickup in timing pointer probe hole (Figure 13) . Insert pickup until it almost touches vibration damper.
  1. Attach clamp from Timing Meter Adapter Rotunda 078-00201 or equivalent, to the line pressure sensor on No. 1 injector nozzle (F-Series) or No. 4 injector nozzle (E-Series) and connect to timing meter (Figure 14).
    1. Connect dynamic timing meter to battery and dial in minus 20 degrees offset on meter. Disconnect cold start advance solenoid connector from solenoid terminal (Figure 11).
    1. With transmission in NEUTRAL and rear wheels raised off the ground, start engine. Using Throttle Control Tool D83T-9000-E or equivalent, set engine speed to 2000 rpm with no accessory load. Observe injection timing on dynamic timing meter. Injection timing should be 8.5 degrees BTDC at 2000 rpm.

    Note: Activating cold start advance solenoid can result in engine speed increase. Adjust throttle control to attain 2000 rpm, if required.

    1. Apply battery voltage to cold start advance solenoid terminal to activate it.
    1. Check timing at 2000 rpm. The timing should be advanced at least 1 degree before the timing obtained in Step 5. If the advance is less than 1 degree, replace fuel injection pump top cover assembly.
    1. If dynamic timing is not within ±2 degrees of specification, adjustment of pump timing is necessary.
    1. Turn engine off. Note timing mark alignment. Remove fast idle bracket and solenoid from injection pump. Break torque (keeping nuts snug) on nuts attaching injection pump to pump mounting adapter with Tool T83T-9000-B or equivalent (Figure 2).
    1. Install rotating tool, T83T-9000-C or equivalent (Figure 4), on front of pump. Rotate clockwise (when viewed from front of engine) to retard, and counterclockwise to advance timing, by lightly tapping tool with a rubber mallet. Two degrees of dynamic timing is approximately 0.75mm (0.030 inch) of timing mark movement.
    1. Remove rotating tool and tighten nuts to specification. Start engine and recheck timing. Repeat Steps 9, 10 and 11 as necessary, to set timing to ± 1 degree of specification.
    1. Turn engine off. Remove dynamic timing components. Install fast idle bracket and solenoid and tighten bolts to specification.
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