TorqFix

Remove MPV GY cylinder head: Mazda (GY)

Step-by-step remove MPV GY cylinder head for the Mazda (GY): 145 steps. What to remove, in what order, and what to check after.

Taking the cylinder heads off the Mazda MPV with the 2.5 V6 GY engine means stripping both banks and the timing chain drive, so plan for a full day on the bench rather than a quick head swap. Coolant is drained, then the air filter, airflow meter, inlet manifold runner control parts, fuel rail with injectors, inlet manifold, alternator, power steering pump and air-conditioning compressor (left connected) are moved out of the way. The engine is supported while a mount is removed, the crankshaft pulley, sump and timing chain cover come off, and each chain is released with the crankshaft turned to align the marks. Two things matter most: following the staged loosening order for the bearing caps and head bolts, and keeping each bank's camshafts and caps together.

145 steps 1 engine code

🧭 Before you start

Drain the coolant and clear the top of the engine: intake, fuel rail and injectors, inlet manifold and ancillaries. Support the engine, remove a mount, the crankshaft pulley, sump and timing chain cover. Align the timing marks, remove tensioners, guides and both chains, then remove the camshaft bearing caps, camshafts and head bolts in stages for each bank. Installation reverses removal.

Fits: platform codes 2.5, V6

  • Opens: coolant, fuel
  • Timing position: the crankshaft or camshaft is set and locked during this job

Don't miss

  • Leave the air-conditioning compressor and power steering pump connected; hang them aside rather than opening the circuits.
  • Plug the fuel line ends once disconnected.
  • Do not remove the inlet manifold runner control cable bracket.
  • Loosen bearing caps and cylinder head bolts in several stages, in the order shown, on each bank.
  • Turn the crankshaft clockwise to bring the marks into line before each chain comes off.
  • Keep camshafts and bearing caps labelled by bank and position so they go back where they came from.

Written for this job from the workshop steps below · TorqFix editorial.

🔧 Engine codes this applies to

GY

📋 Procedure

  1. Installation is in the reverse order of removal
  2. Drain the coolant
  3. Valve cover
  4. Crankshaft pulley:
  5. Remove the battery tray
GY? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Stage 5:
  2. Stage 6:
  3. Left cylinder head:
  4. Remove the coolant pump cover
  5. Stage 2:
  6. Stage 3:
  7. Stage 4:
  8. Stage 5:
  9. Stage 6:
  10. Disconnect the oil cooler hoses
  11. Remove:
  12. Remove the air filter and the air inlet hose
  13. Remove the mass airflow meter with hose
  14. Remove the bracket
  15. Remove the inlet manifold runner control cable
  16. Note: Do not remove the cable bracket
  17. Valve cover
  18. Timing cover
  19. Remove the idle speed control valve
  20. Stage 2:
  21. Remove the inlet manifold
  22. Disconnect the fuel lines
  23. Use a special tool:
  24. Note: Plug the ends of the fuel lines
  25. Remove the fuel rail together with the injectors
  26. Remove the inlet manifold runner control housing
  27. Remove the ancillary drive belt
  28. Disconnect the spark plugs and ignition coil
  29. Sensor ring
  30. Remove the oil sump
  31. Remove the centre drive shaft
  32. Remove the alternator
  33. Remove the air-conditioning compressor but do not disconnect
  34. Remove the engine hanger
  35. Remove engine mount No. 3
  36. Remove the power steering pump pulley
  37. Remove the power steering pump but do not disconnect the lines
  38. Remove:
  39. Remove the camshaft sealing ring
  40. Remove the bracket
  41. Remove the valve cover
  42. Remove the alternator bracket
  43. Remove the crankshaft pulley centre bolt
  44. Remove the crankshaft pulley
  45. Use a special tool:
  46. Remove the oil seal
  47. Remove the timing chain cover
  48. Remove the crankshaft position sensor ring
  49. Remove the seal housing
  50. Turn the crankshaft clockwise to align the timing marks
  51. Turn the crankshaft clockwise
  52. Remove the tensioner and chain guide
  53. Remove the timing chain
  54. Turn the crankshaft clockwise by 1 2/3 turns
  55. Remove the tensioner and chain guide
  56. Remove the timing chain
  57. Remove the crankcase breathers
  58. Remove the water pipe
  59. Right cylinder head:
  60. Remove the bolts
  61. In several stages
  62. Remove the camshaft bearing caps
  63. Remove the bolts
  64. In several stages
  65. In the order shown
  66. Remove the camshaft bearing caps
  67. Remove the camshafts
  68. Loosen the cylinder head bolts
  69. In several stages
  70. In the order shown
  71. Remove the cylinder head bolts
  72. Remove the cylinder head
  73. Left cylinder head:
  74. Remove the bolts
  75. In several stages
  76. Remove the camshaft bearing caps
  77. Remove the bolts
  78. In several stages
  79. In the order shown
  80. Remove the camshaft bearing caps
  81. Remove the camshafts
  82. Loosen the cylinder head bolts
  83. In several stages
  84. In the order shown
  85. Remove the cylinder head bolts
  86. Remove the cylinder head
  87. Fit the bearing caps
  88. Tighten the bolts

Other MAZDA procedures

Who makes these pages, and how

TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.

The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.

Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.

Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com

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Workshop data on this page last updated 20 Sep 2026.