Valve Clearance: Adjustments
VALVE CLEARANCE ADJUSTMENT [LF]
1. Remove the battery and battery tray. Removal and Replacement
2. Remove the plug hole plate. Service and Repair
3. Remove the air cleaner. Service and Repair
4. Disconnect the ventilation hose. Service and Repair
5. Remove the front suspension tower bar (joint). ( Service and Repair.)
6. Remove the CMP sensor. Service and Repair
7. Disconnect the oil control valve (OCV) connector.
8. Disconnect the P/S pressure switch connector.
9. Remove the ignition coils. Service and Repair
10. Remove the cylinder head cover. Service and Repair
11. Remove the drive belt. Service and Repair
12. Remove the engine front cover lower blind plug.
13. Remove the engine front cover upper blind plug.
14. Remove the cylinder block lower blind plug.
15. Remove the under cover. Transverse Member Removal/Installation
16. Install the SST as shown.
17. Turn the crankshaft clockwise until the crankshaft is in the No.1 cylinder TDC position.
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.
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:
- The ratchet has not been unlocked if the bolt cannot be pressed in approx. 5 mm {0.2 in}.
- If the tensioner arm cannot be secured, return the bolt to its original position and repeat the procedure from Step 3.
19. Hold the exhaust camshaft using a suitable wrench on the cast hexagon as shown.
20. Remove the exhaust camshaft sprocket bolt, exhaust camshaft sprocket, and washer as a single unit.
CAUTION:
- Perform the work carefully so that the washer does not drop out.
21. Remove the OCV. Service and Repair
22. Loosen the camshaft cap bolts in several passes in the order shown.
NOTE:
- The camshaft caps are to be kept ordered for correct reassembly in their original positions. Do not mix the caps.
23. Remove the camshafts.
24. Remove the tappet.
25. Select proper adjustment tappet.
New adjustment shim
- = Removed shim thickness + Measured valve clearance - Standard valve clearance (IN: 0.25 mm {0.0098 in}, EX: 0.30 mm {0.0118 in})
Valve clearance [Engine cold]
- IN: 0.22-0.28 mm {0.0087-0.0110 in}
- EX: 0.27-0.33 mm {0.0107-0.0129 in}
26. Apply the gear oil (SAE No. 90 or equivalent) to each journal of the cylinder head as shown in the figure.
27. Install the camshaft with No.1 cylinder camshaft lobes aligned with the TDC position.
28. Apply the gear oil (SAE No. 90 or equivalent) to each journal of the camshaft as shown in the figure.
29. Tighten the camshaft cap bolt with the following two steps.
Tightening torque
- (1) Tighten to 5.0-9.0 Nm {51.0-91.7 kgf-cm, 44.3-79.6 in-lbf}
- (2) Tighten to 14.0-17.0 Nm {1.5-1.7 kgf-m, 10.4-12.5 ft-lbf}
30. Install the OCV. Service and Repair
31. Install the exhaust camshaft sprocket bolt, exhaust camshaft sprocket, and a new washer as a single unit.
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.
32. Install the SST to the camshaft as shown in the figure.
33. Remove the installation bolt for the engine front cover upper blind plug (M6 X 1.0 length 25-35mm {0.99-1.3 in}), and apply tension to the timing chain.
34. Turn the crankshaft clockwise until the crankshaft is in the No.1 cylinder TDC position.
35. Hold the exhaust camshaft using a suitable wrench on the cast hexagon as shown.
36. Tighten the exhaust camshaft sprocket bolt.
Tightening torque
- 69-75 Nm {7.1-7.6 kgf-m, 50.9-55.3 ft-lbf}
37. Remove the SST from the camshaft.
38. Remove the SST from the block lower blind plug.
39. 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 32.
40. Install the under cover. Transverse Member Removal/Installation
41. Apply silicone sealant to the engine front cover upper blind plug.
CAUTION:
- Install the engine front cover upper blind plug before the applied silicone sealant starts to harden.
42. Install the engine front cover upper blind plug.
Tightening torque
- 8.0-11.5 Nm {82-117 kgf-cm, 71-101 ft-lbf}
43. Install the cylinder block lower blind plug.
Tightening torque:
- 18-22 Nm {1.9-2.2 kgf-m, 13.3-16.2 ft-lbf}
44. Install the 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. Service and Repair
46. Measure the valve clearance.
a. Turn the crankshaft clockwise so that the No.1 piston is at TDC of the compression stroke.
b. Measure the valve clearance at A in the figure.
- If the valve clearance is out of the specification, adjust it.
NOTE:
- Make sure to note down the measured values for choosing the suitable replacement tappets.
Valve clearance [Engine cold]
- IN: 0.22-0.28 mm {0.0087-0.0110 in}
- EX: 0.27-0.33 mm {0.0107-0.0129 in}
c. Turn the crankshaft 360° clockwise so that the No.4 piston is at TDC of the compression stroke.
d. Measure the valve clearance at B in the figure.
- If the valve clearance is out of the specification, adjust it.
NOTE:
- Make sure to note down the measured values for choosing the suitable replacement tappets.
Valve clearance [Engine cold]
- IN: 0.22-0.28 mm {0.0087-0.0110 in}
- EX: 0.27-0.33 mm {0.0107-0.0129 in}
47. Install the cylinder head cover. Service and Repair
48. Install the ignition coils. Service and Repair
49. Connect the OCV connector.
50. Install the CMP sensor. Service and Repair
51. Install the front suspension tower bar (joint). Service and Repair
52. Connect the ventilation hose. Service and Repair
53. Install the air cleaner. Service and Repair
54. Install the plug hole plate. Service and Repair
55. Install the battery and battery tray. Service and Repair