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VALVE CLEARANCE ADJUSTMENT

BME011012111603

1. Remove the injection nozzle bracket.

2. Remove the injection nozzle.

  Caution

  • When removing the injection nozzle bracket, always replace the injection nozzle washer. When replacing the injection nozzle washer, wipe off any carbon adhering to the nozzle installation surface of the cylinder head with a clean cloth before installing.

3. Turn the crankshaft clockwise and set the No.1 cylinder to compression TDC.

4. Adjust the valve clearance A with the No.1 cylinder at TDC of compression, and those of B with the No.4 cylinder at TDC compression.

  (1) Hold the rocker bridge using the SST (49 G012 006).
  (2) Loosen the locknut (d) using the SST (49 G012 004), and then turn the adjusting screw (c) using the SST (49 G012 005) until it is separated from the valve stem completely.
  (3) Loosen the rocker arm locknut (b) using the SST (49 G012 004), and then turn the adjusting screw (a) using the SST (49 G012 005) until it is separated from the rocker bridge completely.
  (4) Insert a feeler gauge between the rocker arm and rocker bridge (e).
Standard valve clearance [Engine cold]

  IN: 0.12-0.18 mm {0.0048-0.0070 in} (0.15±0.03 mm {0.0059±0.0012 in})
  EX: 0.32-0.38 mm {0.0126-0.0149 in} (0.35±0.03 mm {0.0138±0.0012 in})

  (5) Adjust the valve clearance by turning the adjuster (a) using the SST (49 G012 005).
  Then temporarily tighten locknut (b) using the SST (49 G012 004).
  (6) With the feeler gauge inserted between the rocker arm end rocker bridge, verify that the feeler gauge remains firmly in place even when the adjusting screw (c) is loosened. If the feeler gauge does not remain firmly in place, repeat procedures from Step 1.
  (7) Turn the adjusting screw (c) using the SST (49 G012 005) until it reaches the valve stem and the feeler gauge fits more firmly.
  Then tighten the locknut (d) using the SST (49 G012 004) to specified torque.
Tightening torque

  16-20 N·m {1.6-2.1 kgf·cm, 12-15 in·lbf}

  (8) Loosen the locknut (b) using the SST (49 G012 004) and readjust the valve clearance (e).
Standard valve clearance [Engine cold]

  IN: 0.12-0.18 mm {0.0048-0.0070 in} (0.15±0.03 mm {0.0059±0.0012 in})
  EX: 0.32-0.38 mm {0.0126-0.0149 in} (0.35±0.03 mm {0.0138±0.0012 in})

  (9) Tighten the locknut (b) using the SST (49 G012 004) to specified torque.
Tightening torque

  16-20 N·m {1.6-2.1 kgf·cm, 12-15 in·lbf}

  (10) Verify the valve clearance at (e).
Standard valve clearance [Engine cold]

  IN: 0.12-0.18 mm {0.0048-0.0070 in} (0.15±0.03 mm {0.0059±0.0012 in})
  EX: 0.32-0.38 mm {0.0126-0.0149 in} (0.35±0.03 mm {0.0138±0.0012 in})

5. Turn the crankshaft one full turn and adjust the remaining valve clearances.

6. Install the injection nozzle.

7. Install the injection nozzle bracket.

(SeeInjection Nozzle Assembly Note)