General Procedure

WARNING: This page is about a different variant/trim than selected.

Install the 303-507 and rotate the crankshaft slowly clockwise until the crankshaft balance weight is up against the 303-507 . The engine is now at TDC .

Fig 1: Locating Crankshaft TDC Timing Peg
Courtesy of FORD MOTOR CO.
Mark the balancer unit and shafts on the top for reference that the balancer unit is at TDC .

Fig 2: Locating Balancer Unit And Shafts Reference Mark
Courtesy of FORD MOTOR CO.
NOTE: Due to the precision interior construction of the balancer unit, it should not be disassembled.

Remove the 4 bolts and the balancer unit.

Fig 3: Locating Balancer Unit Bolts
Courtesy of FORD MOTOR CO.
Remove the adjustment shims from the seat faces of the balancer unit.
NOTE: Visually inspect the balancer unit gear for damage and verify that the shaft turns smoothly. If there is any damage or malfunction, replace the balancer unit.

Install the master adjustment shims (No. 50) on the seat faces of the balancer unit.
With the balancer unit shaft marks at the TDC position, slowly install the balancer unit to the cylinder block to avoid interference between the crankshaft drive gear and the balancer unit driven gear.

Fig 4: Locating Balancer Unit And Shafts Reference Mark
Courtesy of FORD MOTOR CO.
Install the balancer unit bolts.
- Tighten in the sequence shown in illustration in 2 stages.
  - Stage 1: Tighten to 25 Nm (18 lb-ft).
  - Stage 2: Tighten to 42 Nm (31 lb-ft).
Fig 5: Balancer Unit Bolts Tightening Sequence
Courtesy of FORD MOTOR CO.
Remove the 303-507 .
- Rotate the crankshaft to confirm that there are no meshing problems between the balancer unit gear and the crankshaft gear.
Fig 6: Locating Crankshaft TDC Timing Peg
Courtesy of FORD MOTOR CO.
Install the 303-507 and rotate the crankshaft slowly clockwise until the crankshaft balance weight is up against the 303-507 .
- Remove the 303-507 .
Fig 7: Locating Crankshaft TDC Timing Peg
Courtesy of FORD MOTOR CO.
NOTE: Measure the backlash and verify that it is within specified range at all of the following 6 positions: 10 degrees, 30 degrees, 100 degrees, 190 degrees, 210 degrees and 280 degrees. It will be necessary to reset the measuring equipment between measurements.

NOTE: The measurement must be taken with the 100-002 (TOOL-4201-C), a 5-mm Allen wrench and worm clamp set up as shown in illustration. Mark the Allen wrench with a file 80 mm (3.149 in) above the driven gear shaft center. Make sure the worm clamp and Allen wrench are not touching the balance shaft housing.

NOTE: For an accurate measurement while measuring the gear backlash, insert a screwdriver as shown in illustration into the crankshaft No. 1 crankweight area and set both the rotation and the thrust direction with the screwdriver, using a prying action as shown in illustration.

Position the 100-002 (TOOL-4201-C) as shown in illustration. Measure the gear backlash.
- Position the 100-002 (TOOL-4201-C) (1) on the Allen wrench 80 mm (3.149 in) above the driven gear shaft center (2) on the balancer unit.
- Rotate the crankshaft clockwise and measure the backlash at all of the following 6 positions: 10 degrees, 30 degrees, 100 degrees, 190 degrees, 210 degrees and 280 degrees.
Fig 8: Measuring Gear Backlash Using Dial Indicator Gauge
Courtesy of FORD MOTOR CO.
NOTE: If maximum backlash exceeds 0.101 mm (0.003 in), install a new balancer unit.

Using the backlash measurement, select the proper shims from the Adjustment Shim Selection Table.
- Remove the balancer unit from the cylinder block.
- Install the selected adjustment shims on the seat faces of the balancer unit.
Fig 9: Adjustment Shim Selection Table
Courtesy of FORD MOTOR CO.
Install the 303-507 and rotate the crankshaft slowly clockwise until the crankshaft balance weight is up against the 303-507 . The engine is now at TDC .

Fig 10: Locating Crankshaft TDC Timing Peg
Courtesy of FORD MOTOR CO.
With the balancer unit shaft marks in the TDC position, slowly install the balancer unit to the cylinder block to avoid interference between the crankshaft drive gear and the balancer unit driven gear.

Fig 11: Locating Balancer Unit And Shafts Reference Mark
Courtesy of FORD MOTOR CO.
Install the balancer unit bolts.
- Tighten in the sequence shown in illustration in 2 stages.
  - Stage 1: Tighten to 25 Nm (18 lb-ft).
  - Stage 2: Tighten to 42 Nm (31 lb-ft).
Fig 12: Identifying Balancer Unit Bolts Tightening Sequence
Courtesy of FORD MOTOR CO.
NOTE: Remeasure the backlash and verify that it is within specified range at all of the following 6 positions: 10 degrees, 30 degrees, 100 degrees, 190 degrees, 210 degrees and 280 degrees. It will be necessary to reset the measuring equipment between measurements.

NOTE: The measurement must be taken with the 100-002 (TOOL-4201-C), a 5-mm Allen wrench and worm clamp set up as shown in illustration. Mark the Allen wrench with a file 80 mm (3.149 in) above the driven gear shaft center. Make sure the worm clamp and Allen wrench are not touching the balance shaft housing.

NOTE: For an accurate measurement while measuring the gear backlash, insert a screwdriver as shown in illustration into the crankshaft No. 1 crankweight area and set both the rotation and the thrust direction with the screwdriver, using a prying action as shown in illustration.

Position the 100-002 (TOOL-4201-C) as shown in illustration. Measure the gear backlash.
- Position the 100-002 (TOOL-4201-C) (1) on the Allen wrench 80 mm (3.149 in) above the driven gear shaft center (2) on the balancer unit.
- Rotate the crankshaft clockwise and measure the backlash at all of the following 6 positions: 10 degrees, 30 degrees, 100 degrees, 190 degrees, 210 degrees and 280 degrees.
- If the backlash exceeds the specified range of 0.005 to 0.101 mm (0.00019 to 0.0039 in), install a new balancer unit and repeat the procedure.
Fig 13: Measuring Gear Backlash Using Dial Indicator Gauge
Courtesy of FORD MOTOR CO.