Valve Clearance Adjustment
VALVE CLEARANCE ADJUSTMENT1. Remove the engine front cover lower blind plug.
2. Remove the engine front cover upper blind plug.
3. Remove the cylinder block lower blind plug and install the SST.
4. Rotate the crankshaft clockwise so that the No. 1 piston is at TDC of the compression stroke. (The position crank weight contacts the SST.)
5. Loosen the timing chain.
1) Using a suitable screwdriver or equivalent tool, unlock the timing chain tensioner ratchet.
2) Rotate the exhaust camshaft clockwise using a suitable wrench on the cast hexagon and loosen the timing chain tensioner.
3) Using a suitable bolt (M6 X 1.0 length 25-35 mm (0.99-1.37 in)) at the engine front cover upper blind plug, secure the tensioner arm at the position where the tension is released.
6. Secure the exhaust camshaft using a wrench on the cast hexagon and loosen the camshaft sprocket installation bolt.
7. Remove the installation bolt and exhaust camshaft sprocket.
8. Loosen the camshaft cap bolts in two or three passes in the order shown in the figure, and remove the camshaft bearing caps.
Note
- The camshaft caps are to be kept ordered for correct reassembly in their original positions. Do not mix the caps.
9. Remove the camshafts for intake and exhaust sides.
10. Remove the tappet.
11. Select and install the suitable tappet according to the result of valve clearance inspection. Selected tappet = Removed tappet thickness + Measured valve clearance - Standard valve clearance
Standard valve clearance [when cold]
IN: 0.22-0.28 mm (0.0087-0.0110 in)
EX: 0.27-0.33 mm (0.0106-0.0130 in)
12. Install the camshaft with the No.1 cylinder cam aligned at TDC of the compression stroke.
13. Install the camshaft bearing cap and tighten the camshaft bearing cap bolts in two passes in the order shown in the figure.
Tightening procedure
1) 5.0-9.0 N-m (51.0-91.7 kgf-cm,44.3 79.6 in-lbf)
2) 14.0-17.0 N-m (1.5-1.7 kgf-m, 10.4 12.5 ft-lbf)
14. Install a new washer.
15. Install the exhaust camshaft sprocket.
Caution
- Do not tighten the camshaft sprocket installation bolt during this step.
16. Install the SST on the camshaft as shown in the figure.
17. Remove the bolt (M6 X 1.0 length 25-35 mm (0.99-1.37 in)) from the engine front cover upper blind plug and apply tension to the timing chain.
18. Rotate the crankshaft clockwise and verify that the No.1 piston is at TDC of the compression stroke.
19. Secure the exhaust camshaft using a wrench on the cast hexagon and tighten the sprocket installation bolt.
Tightening torque
69-75 N-m (7.1-7.6 kgf-m, 50.9-55.3 ft-lbf)
20. Remove the SST from the camshaft.
21. Remove the SST installed in the cylinder block lower blind plug hole.
22. Rotate the crankshaft clockwise two turns and inspect the valve timing.
23. Apply silicone sealant and install the engine front cover upper blind plug.
Tightening torque
8.0-11.5 N-m (81.6-117.2 kgf-cm, 70.9-101.7 in-lbf)
24. Install the cylinder block lower blind plug.
Tightening torque
18-22 N-m (1.9-2.2 kgf-m, 13.3-16.2 ft-lbf)
25. Install a new engine front cover lower blind plug.
Tightening torque
10.0-14.0 N-m (102.0-142.7 kgf-cm, 88.6-123.9 in-lbf)