Valve Clearance Adjustment

Special Tool(s) / General Equipment 

Courtesy of FORD MOTOR COMPANY	303-1604Timing Peg, Crankshaft TDC
Courtesy of FORD MOTOR COMPANY	303-1605Alignment Tool, Camshaft
Feeler Gauge

Materials 

Name	Specification
Engine Oil - SAE 5W-20	WSS-M2C948-B
Motorcraft ® Gasket MakerTA-16	WSK-M2G348-A5

Check 

• 1.
  
  Remove the valve cover. Refer to: Valve Cover .

• 2.
  
  
  NOTE: Only rotate the crankshaft clockwise.

  Rotate the crankshaft until the corresponding piston is at TDC and then measure the valve clearance(s). Use the General Equipment: Feeler Gauge

• 3.
  
  Note down each cylinder number and the valve clearances measured.

• 4.
  
  Compare the measured valve clearance(s) with the specifications. Refer to: Specifications .

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Adjustment 

• 1.
  
  
  NOTE: The following steps are only necessary if adjustment is required.

• 2.
  
  Remove the VCT unit. Refer to: Variable Camshaft Timing (VCT) Unit .

• 3.
  
  Remove Special Service Tool: 303-1605 Alignment Tool, Camshaft.

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• 4.
  
  Using the screwdriver, rotate the flywheel in a counterclockwise direction.

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• 5.
  
  
  NOTE: Note the position of the components before removal.

  Loosen the camshaft bearing caps in sequence, 2 turns at a time until all tension is released from the camshaft bearing caps and remove the bolts, caps and camshafts.

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• 6.
  
  
  • Remove the valve tappet and read the thickness from the underside.
  • The number on the valve tappet indicates the thickness of the bottom of the tappet. However, the number only indicates the digits after the decimal point (example: 725 = 2.725).

• 7.
  
  
  • Calculate the required thickness of the valve tappet with the following formula: X = S + M - V
  • Required thickness of tappet = X
  • Thickness of currently fitted tappet = S
  • Measurement of existing valve clearance (actual value) = M
  • Desired valve clearance = V

• 8.
  
  Install the correct valve tappet.

• 9.
  
  
  NOTE: Make sure that the components are installed to the position noted before removal.

  Lubricate and install the camshafts approximately at valve overlap position cylinder No. 1.

  Material: Engine Oil - SAE 5W-20 (WSS-M2C948-B)

• 10.
  
  Lubricate the camshaft journals and camshaft bearing caps and install.

  Material: Engine Oil - SAE 5W-20 (WSS-M2C948-B)

• 11.
  
  
  NOTE: Install all the bolts finger tight before final tightening.

  Tighten each bolt 2 turns at a time.

• 12.
  
  Torque: 89 lb.in (10 Nm)

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• 13.
  
  

  • 1.
    
    Turn the camshafts to measure the valve clearance.

  • 2.
    
    Measure the valve clearances and repeat this procedure as necessary until all valve clearances are within the specified tolerance.

• 14.
  
  
  NOTE: Note the position of the components before removal.

  Loosen the camshaft bearing caps in sequence, 2 turns at a time until all tension is released from the camshaft bearing caps and remove the bolts, caps and camshafts.

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• 15.
  
  
  NOTE: Make sure that the mating faces are clean and free of foreign material.
  NOTE: The component must be installed within 5 minutes of applying the sealant.

  Apply 3 mm (0.118 in) beads of gasket maker to the intake rear camshaft bearing cap mating surface as shown below.

  Material: Motorcraft ® Gasket Maker / TA-16 (WSK-M2G348-A5)

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• 16.
  
  
  NOTE: Make sure that the mating faces are clean and free of foreign material.
  NOTE: The component must be installed within 5 minutes of applying the sealant.

  Apply 3 mm (0.118 in) beads of gasket maker to the exhaust rear camshaft bearing cap mating surface as shown below.

  Material: Motorcraft ® Gasket Maker / TA-16 (WSK-M2G348-A5)

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• 17.
  
  
  NOTE: Make sure that the components are installed to the position noted before removal.

  Lubricate and install the camshafts approximately at valve overlap position cylinder No. 1.

  Material: Engine Oil - SAE 5W-20 (WSS-M2C948-B)

• 18.
  
  Lubricate the camshaft journals and camshaft bearing caps and install.

  Material: Engine Oil - SAE 5W-20 (WSS-M2C948-B)

• 19.
  
  
  NOTE: Install all the bolts finger tight before final tightening.

  Tighten each bolt 2 turns at a time.

• 20.
  
  Torque: 89 lb.in (10 Nm)

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• 21.
  
  

  • 1.
    
    Install Special Service Tool: 303-1605 Alignment Tool, Camshaft.

  • 2.
    
    
    NOTE: Only tighten the bolts finger tight at this stage.

  • 3.
    
    Torque: 89 lb.in (10 Nm)

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• 22.
  
  Install Special Service Tool: 303-1604 Timing Peg, Crankshaft TDC.

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• 23.
  
  
  NOTE: Only rotate the crankshaft clockwise.

  Rotate the crankshaft slowly until the crankshaft stops.

• 24.
  
  Remove Special Service Tool: 303-1604 Timing Peg, Crankshaft TDC.

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• 25.
  
  Install the VCT unit. Refer to: Variable Camshaft Timing (VCT) Unit .