Mazda 3 manuals

Mazda 3 Service Manual: Valve Clearance Adjustment [Mzr 2.0, Mzr 2.5]

Mazda 3 Service Manual / Engine / Engine Assembly / Valvetrain, Cylinder Head / Valve Clearance Adjustment [Mzr 2.0, Mzr 2.5]

1. Remove the battery cover..

2. Disconnect the negative battery cable.

3. Remove the plug hole plate..

4. Disconnect the wiring harness.

5. Remove the ignition coils..

6. Remove the spark plugs..

7. Remove the ventilation hose.

8. Remove the oil level gauge.

9. Remove the cylinder head cover..

10. Remove the aerodynamic under cover No.2 and splash shield as a single unit..

11. Remove the generator drive belt with the A/C drive belt still installed and set it out of the way. (MZR 2.0).

12. Remove the drive belt. (MZR 2.5).

13. Remove the engine front cover lower blind plug.


14. Remove the engine front cover upper blind plug.


15. Disconnect the drive shaft (RH) from joint shaft, set the drive shaft (RH) out of the way. (MTX).

16. Remove the cylinder block lower blind plug, and install the SST.


17. Rotate the crankshaft in the direction of the engine rotation so that the No.1 piston is at top dead center (TDC) of the compression stroke. (Until the counterweight contacts SST

and stops.)

18. Loosen the timing chain using the following procedure.

a. Insert a suitable bolt (M6 X 1.0, length 2535 mm {1.01.3 in})

into the engine front cover upper blind plug and tighten it until it contacts the chain tensioner arm, and then rotate it back one turn. (Set the bolt slightly away from the chain tensioner arm so that it does not contact it.)


b. Using the cast hexagon on the exhaust camshaft, apply force counterclockwise to facilitate unlocking the chain tensioner ratchet.


c. Using a Hex bit socket (2.5 mm {0.098 in})

or T15 Torx bit socket, unlock the chain tensioner ratchet so that it can be lifted up.


d. Using the cast hexagon on the exhaust camshaft, apply force in the direction of the engine rotation to increase tension on the chain.


NOTE:

e. Screw in the bolt set in Step 1 approx. 5 mm {0.2 in} and secure the tensioner arm with the rack compressed.

NOTE:


19. Fix the exhaust camshaft using a wrench on the cast hexagon, and loosen the camshaft sprocket bolt.


20. Remove the exhaust camshaft sprocket bolt, exhaust camshaft sprocket, and washer (The washers may not be installed.) as a single unit.

CAUTION:

NOTE:


21. Remove the OCV..

22. Loosen the camshaft cap bolts in two or three steps in the order shown in the figure and remove the camshaft cap.

NOTE:


23. Remove the camshafts for the intake and exhaust sides.

24. Remove the tappet.

25. Install an appropriate tappet based on the results of the valve clearance inspection.

26. Verify that No.1 cylinder is at TDC of the compression stroke. (Position counterweight contacts SST

.)

27. Apply the gear oil (SAE No.90 or equivalent) to each journal of the cylinder head as shown in the figure.


28. Install the camshaft with No.1 cylinder aligned with the TDC position.

29. Apply the gear oil (SAE No.90 or equivalent) to each journal of the camshaft as shown in the figure.


30. Temporarily tighten the camshaft cap bolts evenly in 23 steps.

31. Tighten the camshaft cap bolts in the order shown in the following two steps.


32. Install the OCV..

33. Install the timing chain, exhaust camshaft sprocket bolt, exhaust camshaft sprocket, and a new washer (Except MZR 2.0 (ATX).) as a single unit.

CAUTION:

NOTE:


34. Install the SST

on the camshaft as shown in the figure.


35. Remove the installation bolt for the engine front cover upper blind plug (M6 X 1.0 length 2535mm {1.01.3 in})

, and apply tension to the timing chain.

36. Fix the exhaust camshaft using a wrench on the cast hexagon, and tighten the sprocket bolt.


37. Remove the SST

from the camshaft.

38. Remove the SST

installed in the cylinder block lower blind plug hole.

39. Rotate the crankshaft clockwise two turns and inspect the valve timing.

40. Install the cylinder block lower blind plug.


41. Connect the drive shaft (RH) to joint shaft. (MTX).

42. Apply the silicone sealant and install the engine front cover upper blind plug.


CAUTION:

43. Install a new engine front cover lower blind plug.


44. Install the drive belt. (MZR 2.5).

45. Install the generator drive belt. (MZR 2.0).

46. Install the aerodynamic under cover No.2 and splash shield as a single unit..

47. Install the cylinder head cover..

48. Install the oil level gauge.

49. Install the ventilation hose.

50. Install the spark plugs..

51. Install the ignition coils..

52. Connect the wiring harness.

53. Install the plug hole plate..

54. Connect the negative battery cable..

55. Install the battery cover..

Cylinder Head Gasket Replacement [Mzr 2.0, Mzr 2.5]
WARNING: Fuel vapor is hazardous. It can very easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are danger ...

Valve Clearance Inspection [Mzr 2.0, Mzr 2.5]
1. Remove the battery cover.. 2. Disconnect the negative battery cable.. 3. Remove the plug hole plate.. 4. Disconnect the wiring harness. 5. Remove the ignition coils.. 6. Remove the spark ...

Other materials:

Dashboard Illumination
When the position lights are turned on with the ignition switched ON, the brightness of the instrument panel illumination is dimmed. NOTE When the position lights are turned on, the position lights indicator light in the instrument cluster turns on. Refer to Headlights on . The brightness ...

Specifications
Engine Electrical System *1 Q-85 is designed for i-ELOOP system. Only Q-85 should be used to ensure correct operation of i-ELOOP system. Consult an Authorized Mazda Dealer for details. *2 Not for i-ELOOP system. *3 This spark plug provides the SKYACTIV-G engine with optimum perfor ...

Shift Position Indication
The selector position is indicated when the ignition is switched ON. Gear position indication In manual shift mode, the M of the shift position indication illuminates and the numeral for the selected gear is displayed. Warning Light The warning light turns on when the system has a malfun ...

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