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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 56 (Engine Controls [On-Vehicle Adjustments]) >> Engine Mechanical >> Valve Adjustment >> Mazda6 (2.3L)

Mazda6 (2.3L)

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Mazda Tribute, 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, and 2003 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect negative battery cable.
  2. Remove right front tire.
  3. Remove right splash shield.
  4. Remove spark plug cover plate.
  5. Remove high-tension leads.
  6. Remove spark plugs.
  7. Disconnect Oil Control Valve (OCV) 2-pin harness connector.
  8. Remove ventilation hose.
  9. Remove cylinder head cover.
  10. Rotate crankshaft clockwise until No. 1 piston is at TDC of compression stroke. Measure valve clearance between base of camshaft lobe and valve tappets at "A". See Fig 1 . See VALVE CLEARANCE SPECIFICATIONS  table. If clearance is not as specified, record valve location and clearance reading. Go to next step.
    Fig 1: Identifying Valves Requiring Measurement (Mazda6 2.3L, Miata, Protege & Protege5)
    G95F31463Courtesy of MAZDA MOTORS CORP.
    VALVE CLEARANCE SPECIFICATIONS

    Application (1) In. (mm)
    B2300 (2)
    B3000 & B4000 (3)
    Intake .009-.011 (.22-.28)
    Exhaust .011-.013 (.27-.33)
    Mazda6
    3.0L (3)
    2.3L
    Intake .009-.011 (.22-.28)
    Exhaust .011-.013 (.27-.33)
    Miata
    Intake .007-.009 (.18-.24)
    Exhaust .011-.013 (.28-.34)
    MPV (3)
    Protege & Protege5 .009-.012 (.23-.30)
    Tribute
    2.0L
    Intake .004-.007 (.11-.18)
    Exhaust .011-.013 (.27-.34)
    3.0L (3)
    (1) Adjust valves with engine cold.
    (2) Valve clearance is not adjustable. If valve clearance is not within specification, see appropriate article in ENGINES.
    (3) Engines are equipped with hydraulic valve lash adjusters. Valve clearance is not adjustable.
  11. Rotate crankshaft clockwise about 360 degrees, positioning No. 4 piston at TDC of compression stroke. Measure valve clearance between base of camshaft lobe and valve tappets at "B". See Fig 1 . See VALVE CLEARANCE SPECIFICATIONS  table. If clearance is not within specification, Go to next step. If all valve clearances are as specified, go to step  42 .
  12. Remove drive belt.
  13. Remove front drive shaft (RH) from joint shaft. Refer to REMOVAL & INSTALLATION in appropriate DIFFERENTIALS & AXLESHAFTS article in DRIVELINE/AXLES.
  14. Remove engine front cover lower blind plug. See Fig 2 .
    Fig 2: Identifying Engine Front Cover Lower Blind Plug - Mazda6 (2.3L)
    G00193624Courtesy of MAZDA MOTORS CORP.
  15. Remove engine front cover upper blind plug. See Fig 3 .
    Fig 3: Identifying Engine Front Cover Upper Blind Plug - Mazda6 (2.3L)
    G00193625Courtesy of MAZDA MOTORS CORP.
  16. Remove cylinder block lower blind plug. See Fig 4 .
    Fig 4: Identifying Cylinder Block Lower Blind Plug - Mazda6 (2.3L)
    G00193632Courtesy of MAZDA MOTORS CORP.
  17. Install Crankshaft TDC Timing Peg (303-507). See Fig 5 .
    Fig 5: Identifying Crankshaft TDC Timing Peg - Mazda6 (2.3L)
    G00193626Courtesy of MAZDA MOTORS CORP.
  18. Rotate crankshaft clockwise until crankshaft is in No. 1 cylinder TDC position (until balance weight is contacting Crankshaft TDC Timing Peg).
  19. Loosen timing chain:
    1. Unlock chain tensioner ratchet using a suitable screwdriver or equivalent tool.
    2. Rotate exhaust camshaft clockwise using a suitable wrench on cast hexagon and loosen a timing chain.
    3. Placing suitable bolt (6 mm X 25-35 mm) at engine front cover upper blind plug, secure chain guide at position where tension is released. See Fig 6 .
      Fig 6: Loosening & Securing Timing Chain - Mazda6 (2.3L)
      G00193627Courtesy of MAZDA MOTORS CORP.
  20. Hold exhaust camshaft using a suitable wrench on cast hexagon and remove exhaust camshaft sprocket. See Fig 7 .
    Fig 7: Loosening Exhaust Camshaft Bolt - Mazda6 (2.3L)
    G00193628Courtesy of MAZDA MOTORS CORP.
    21. NOTE: Cylinder head and camshaft caps are numbered to be reassembled in their original position correctly. When removed, keep caps with cylinder head from where they were removed. Do not mix caps.
    Fig 8: Identifying Camshaft Cap Bolts Removal Order - Mazda6 (2.3L)
    G00193629Courtesy of MAZDA MOTORS CORP.
  21. Loosen camshaft cap bolts in two or three steps in order. See Fig 8 . Remove camshaft caps.
  22. Remove camshaft.
  23. Remove tappet.
  24. Select proper adjustment shim:

    • New Adjustment Shim

      Measure removed shim. Add shim thickness, plus measured valve clearance, minus standard valve clearance.

    • Standard Valve Clearance (Engine Cold)

      Intake: .010" (.25 mm), Exhaust: .012" (.30 mm).
  25. Install camshaft and No. 1 cylinder aligned with TDC position.
  26. Tighten camshaft cap bolts in order to following torque:
    1. Tighten to 44-80 INCH lbs. (5-9 N.m). See Fig 9 .
    2. Tighten to 124-150 INCH lbs. (14-17 N.m).
    Fig 9: Identifying Camshaft Cap Bolts Tightening Order - Mazda6 (2.3L)
    G00193630Courtesy of MAZDA MOTORS CORP.
  27. Install exhaust camshaft sprocket.
    NOTE: Do not tighten bolt for camshaft sprocket during this step. First confirm valve timing, then tighten bolt.
  28. Install Camshaft Alignment Tool (49-UN30-3465) to camshaft. See Fig 10 .
    Fig 10: Identifying Camshaft Alignment Tool - Mazda6 (2.3L)
    G00193631Courtesy of MAZDA MOTORS CORP.
  29. Remove (6 mm X 25-35 mm) bolt from engine front cover to apply tension to the timing chain.
  30. Turn crankshaft clockwise until crankshaft is in No. 1 cylinder TDC position (until balance weight is contacting Crankshaft TDC Timing Peg).
  31. Hold exhaust camshaft using a suitable wrench on cast hexagon as shown.
  32. Tighten exhaust camshaft sprocket lock bolt. Tightening torque is 66-70 ft. lbs. (89-95 N.m).
  33. Remove Camshaft Alignment Tool (49-UN30-3465) from camshaft.
  34. Remove Crankshaft TDC Timing Peg from block lower blind plug.
  35. Rotate crankshaft two times clockwise until crankshaft is in TDC position. Reinstall camshaft alignment tool to camshaft and crankshaft TDC timing peg in cylinder block and inspect valve timing. If not aligned, loosen crankshaft pulley lock bolt and repeat from step 16).
  36. Apply silicone sealant to engine front cover upper blind plug.
  37. Install engine front cover upper blind plug. Tightening torque 71-102 INCH lbs. (8-11.5 N.m).
  38. Install cylinder block lower blind plug. Tightening torque is 24-30 ft. lbs. (18-22 N.m).
  39. Install new engine front cover lower blind plug. Tightening torque is 89-124 INCH lbs. (10-14 N.m).
  40. Connect right front drive shaft and joint shaft.
  41. Install drive belt.
  42. Install cylinder head cover.
  43. Install ventilation hose.
  44. Install OCV 2-pin harness connector.
  45. Install high-tension leads.
  46. Install spark plugs.
  47. Install spark plug cover plate.
  48. Install right splash shield.
  49. Install right front tire.
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