Balance Shaft Backlash

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

Special Tool(s) / General Equipment

Courtesy of FORD MOTOR COMPANY	100-002 (TOOL-4201-C) Holding Fixture with Dial Indicator Gauge
Courtesy of FORD MOTOR COMPANY	303-507 Timing Peg, Crankshaft TDCTKIT-2001N-FLMTKIT-2001N-ROW

Check

- Install the special tool.
  Install Special Service Tool: 303-507 Timing Peg, Crankshaft TDC.
- Rotate the crankshaft slowly clockwise until the crankshaft balance weight is up against the Crankshaft TDC Timing Peg. The engine is now at TDC.
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Mark the balancer unit and shafts on the top for reference that the balancer unit is at TDC.

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NOTE: Due to the precision interior construction of the balancer unit, it should not be disassembled.

Remove the bolts.

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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.

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Tighten the bolts in sequence displayed below.
Torque:

Stage 1: 18 lb.ft (25 Nm)

Stage 2: 38 lb.ft (52 Nm)

Fig 1: Balancer Unit Bolts Tightening Sequence
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- Remove the special tool.
  Remove Special Service Tool: 303-507 Timing Peg, Crankshaft TDC.
- Rotate the crankshaft to confirm that there are no meshing problems between the balancer unit gear and the crankshaft gear.
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- Install the special tool.
  Install Special Service Tool: 303-507 Timing Peg, Crankshaft TDC.
- Rotate the crankshaft slowly clockwise until the crankshaft balance weight is up against the Crankshaft TDC Timing Peg. The engine is now at TDC.
- Remove the special tool.
  Remove Special Service Tool: 303-507 Timing Peg, Crankshaft TDC.
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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 Dial Indicator Gauge with Holding Fixture, a 5-mm Allen wrench and worm clamp set up as displayed. 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 displayed into the crankshaft No. 1 crankweight area and set both the rotation and the thrust direction with the screwdriver, using a prying action as displayed.
- Using a special tool, Position as displayed below. Measure the gear backlash.
  Use Special Service Tool: 100-002 (TOOL-4201-C) Holding Fixture with Dial Indicator Gauge.
- Position the Dial Indicator Gauge with Holding Fixture (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.
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Using the backlash measurement, select the proper shims from the Adjustment Shim Selection Table.
1. Backlash
2. Selection shim (No.)
3. Shim thickness
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- Remove the balancer unit from the cylinder block.
- Install the selected adjustment shims on the seat faces of the balancer unit.
- Install the special tool.
  Install Special Service Tool: 303-507 Timing Peg, Crankshaft TDC.
- Rotate the crankshaft slowly clockwise until the crankshaft balance weight is up against the Crankshaft TDC Timing Peg. The engine is now at TDC.
Courtesy of FORD MOTOR COMPANY
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.

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Tighten the bolts in sequence displayed below.
Torque:

Stage 1: 18 lb.ft (25 Nm)

Stage 2: 38 lb.ft (52 Nm)

Fig 2: Balancer Unit Bolts Tightening Sequence
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Remove the special tool.
Remove Special Service Tool: 303-507 Timing Peg, Crankshaft TDC.

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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 Dial Indicator Gauge with Holding Fixture, a 5-mm Allen wrench and worm clamp set up. 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 displayed below into the crankshaft No. 1 crankweight area and set both the rotation and the thrust direction with the screwdriver, using a prying action.
- Using a special tool, Position as displayed below. Measure the gear backlash.
  Use Special Service Tool: 100-002 (TOOL-4201-C) Holding Fixture with Dial Indicator Gauge.
- Position the Dial Indicator Gauge with Holding Fixture (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.
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