Variable Valve Timing Actuator Removal/Installation
VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION [MZR 2.5]
CAUTION:
- Variable valve timing actuator can not be disassembled because it is a precision unit.
NOTE:
- Intake camshaft sprocket is integrated with the variable valve timing actuator and cannot be disassembled.
1. Disconnect the negative battery cable.
2. Remove the plug hole plate. Service and Repair
3. Remove the ignition coils. Service and Repair
4. Remove the spark plugs. Service and Repair
5. Remove the ventilation hose. Service and Repair
6. Disconnect the camshaft position (CMP) sensor connector.
7. Disconnect the oil control valve (OCV) connector.
8. Remove the cylinder head cover. Service and Repair
9. Set the front mudguard (RH) out of the way. Service and Repair
10. Remove the splash shield (RH).
11. Remove the aerodynamic under cover No.2. Aerodynamic Under Cover No. 2 Removal/Installation
12. Remove the drive belt. Service and Repair
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. (ATX) Drive Shaft Removal/Installation
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 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 25-35 mm {0.99-1.3 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:
- The chain tensioner rack is compressed using the chain tension generated by applying force to the exhaust camshaft in the direction of the engine rotation.
NOTE:
- The racket has not been unlocked if the bolt cannot be pressed in approx. 5 mm {0.2 in}.
e. Screw in the bolt set in Step 1 approx. 5 mm {0.2 in} and secure the tensioner arm with the rack compressed.
- If the tensioner arm cannot be secured, return the bolt to its original position and repeat the procedure from Step (3).
19. Fix the exhaust camshaft using a wrench on the cast hexagon, and loosen the camshaft sprocket bolt.
CAUTION:
- Perform the work carefully so that the washer does not drop out.
20. Remove the exhaust camshaft sprocket bolt, exhaust camshaft sprocket, and washer as a single unit.
21. Remove the OCV. Oil Control Valve (OCV) Removal/Installation
NOTE:
- The camshaft caps are to be kept ordered for correct reassembly in their original positions. Do not mix the caps.
22. Loosen the camshaft cap bolts in two or three steps in the order shown in the figure and remove the camshaft cap.
23. Remove the variable valve timing actuator and the camshaft on the intake air side as a single unit.
24. Remove the variable valve timing actuator.
NOTE:
- Do not add scratch marks to the camshaft thrust area.
a. Mark the camshaft and variable valve timing actuator as shown in the figure to make sure they are installed in their original position.
b. Secure the camshaft in a vise.
c. Loosen the variable valve timing actuator tightening bolt.
25. Install a new washer.
26. Install the variable valve timing actuator.
CAUTION:
- When the variable valve timing actuator is replaced with a new one, mark it in the same location as the old one.
a. Secure the camshaft in a vise.
b. Align the marks of the camshaft and variable valve timing actuator.
c. Tighten variable valve timing actuator tightening bolt.
Tightening torque
- 69-75 Nm {7.1-7.6 kgf-m, 51-55 ft-lbf}
NOTE:
- If the alignment marks on the variable valve timing actuator are not available, refer to the "TIMING CHAIN ASSEMBLY" in the engine overhaul information and perform the sprocket position alignment again.
27. Verify that No.1 cylinder is at TDC of the compression stroke. (Position counterweight contacts SST.)
28. Apply the gear oil (SAE No.90 or equivalent) to each journal of the cylinder head as shown in the figure.
29. With No.1 cylinder cam aligned at TDC of the compression stroke, install the variable valve timing actuator and the camshaft on the intake air side as a single unit.
30. Apply the gear oil (SAE No.90 or equivalent) to each journal of the camshaft as shown in the figure.
31. Temporarily tighten the camshaft cap bolts evenly in 2-3 steps.
32. Tighten the camshaft cap bolts in the order shown in the following two steps.
Tightening procedure
- 5.0-9.0 Nm {51-91 kgf-cm, 45-79 in-lbf}
- 14-17 Nm {1.5-1.7 kgf-m, 11-12 ft-lbf
33. Install the OCV. Oil Control Valve (OCV) Removal/Installation
CAUTION:
- Install a washer to the fourth or fifth thread of the exhaust camshaft sprocket bolt being careful not to drop the washer.
- Do not tighten the camshaft sprocket bolt at this stage. Verify the valve timing before performing the bolt tightening.
34. Install the timing chain, exhaust camshaft sprocket bolt, exhaust camshaft sprocket, and a new washer as a single unit.
35. Install the SST on the camshaft as shown in the figure.
36. Remove the installation bolt for the engine front cover upper blind plug (M6 X 1.0 length 25-35mm {1.0-1.3 in}), and apply tension to the timing chain.
37. Fix the exhaust camshaft using a wrench on the cast hexagon, and tighten the sprocket bolt.
Tightening torque
- 69-75 Nm {7.1-7.6 kgf-m, 51-55 ft-lbf}
38. Remove the SST from the camshaft.
39. Remove the SST installed in the cylinder block lower blind plug hole.
40. Rotate the crankshaft clockwise two turns and inspect the valve timing.
- If not aligned, loosen the camshaft sprocket bolt and repeat the procedure from Step 35.
41. Install the cylinder block lower blind plug.
Tightening torque
- 18-22 Nm {1.9-2.2 kgf-m, 14-16 ft-lbf}
42. Connect the drive shaft (RH) to joint shaft. (ATX) Drive Shaft Removal/Installation
43. Apply the silicone sealant and install the engine front cover upper blind plug.
CAUTION:
- Install the engine front cover upper blind plug before the applied silicone sealant starts to harden.
Tightening torque
- 8-11 Nm {82-117 kgf-cm, 71-101 in-lbf}
44. Install a new engine front cover lower blind plug.
Tightening torque
- 10-14 Nm {102-142 kgf-cm, 89-123 in-lbf}
45. Install the drive belt. (See Service and Repair.)
46. Install the aerodynamic under cover No.2. Aerodynamic Under Cover No. 2 Removal/Installation
47. Install the splash shield (RH).
48. Install the front mudguard (RH). Service and Repair
49. Install the cylinder head cover. (See Service and Repair.)
50. Connect the OCV connector.
51. Connect the CMP sensor connector.
52. Install the ventilation hose. Service and Repair
53. Install the spark plugs. Service and Repair
54. Install the ignition coils. Service and Repair
55. Install the plug hole plate. Service and Repair
56. Connect the negative battery cable.