Removal
1. Set piston N1 to top dead center.
2. Disconnect the wire from the negative terminal of the battery.
3. Remove the valve cover.
4. Remove the ignition distributor (for SOHC engines) or crankshaft angle sensor (DOHC engines).
SOHC engines
5. Drain the coolant from the cooling system and the upper radiator hose from the thermostat.
6. Remove the fuel pump.
7. Remove the timing belt and camshaft sprocket(s)
9.8 Carefully remove the seal, being careful not to scratch the metal surfaces (1.5 l)
8. Wrap the tip of the screwdriver with insulating tape. Carefully remove the camshaft oil seal from the groove using the screwdriver (9.8).
9. Remove the rocker arm shaft together with the rocker arms.
9.10 For 1.5L engines, remove the lower bolts (A) and bracket, then remove the upper bolts (B) and thrust ring bolt (C)
10. For 1.5 l engines, remove the rear cylinder head cover and unscrew the camshaft thrust ring bolts (9.10).
9.11 For 1.5L engines, clamp the camshaft between the third and fourth cams and unscrew the thrust ring bolt
11. Lock the camshaft and unscrew the camshaft thrust cover bolt (9.11).
9.12 For 1.5L engines, remove the thrust ring from the cylinder head.
12. Remove the stop from the cylinder block (9.12).
9.13 Remove the camshaft from the cylinder head
13. For better access, unscrew the windshield washer reservoir and move it to the side. Remove the camshaft from the cylinder head (9.13).
DOHC engines
9.14 Camshafts of DOHC engines
1. Bearing caps; 2. Camshaft; 3. Rocker arms; 4. Rocker arm lifters; 5. Camshaft oil seal; 6. Camshaft sprocket
14. Remove the camshaft bearing caps. Carefully remove the camshafts from the cylinder block (9.14).
Examination
15. Thoroughly clean the camshafts, rear cover and gasket mounting surfaces.
16. Inspect the camshafts, timing gear, and cam surfaces for wear and damage. Inspect the bearing surfaces for damage.
9.17 Measure the height of the cams
17. Measure the height of the cams (9.17) and compare them with the technical specifications.
9.19 Measure the bearing diameters
18. Measure the bearing diameters (9.19), then measure the inner diameters of the bearing shells in the cylinder head. Subtract the bearing diameter from the shell diameter to obtain the lubrication gap value. Compare this value with the value given in the Technical Specifications.
19. Replace the camshaft if it fails any of the above checks. If the cams are worn, replace the camshaft and rocker arms. If the bearing shells are damaged or worn, the cylinder head may need to be replaced.
9.20 Using a feeler gauge, measure the axial clearance (1.5L engines)
20. For 1.5L engines, install the thrust ring on the camshaft and tighten the bolt. Check the axial clearance of the shaft (9.20).
21. If the axial clearance is too large, check how much the other end of the shaft is worn. If the wear is too severe, replace the shaft.
Installation
23. Lightly lubricate the bearings and shaft liners with engine oil.
24. Carefully install the shaft into the cylinder head.
25. On SOHC engines, install the thrust washer. Secure the thrust washer with the bolt. Install the rear cover with a new gasket and tighten the bolts to the specified torque.
26. On DOHC engines, install the shaft bearing caps. Tighten the cap bolts to the specified torque.
9.27 Install the oil seal (1.5L engines)
27. Lubricate the shaft seal with engine oil and install it in place (9.27).
28. Install the camshaft sprockets and tighten the bolts to the specified torques.
29. Install the timing belt.
30. On SOHC engines, install the rocker shafts and rocker arms.
31. Adjust the valve clearances.
32. Install the remaining parts.
33. Start and warm up the engine.
34. Re-adjust the valves.
35. Install the valve cover and check the engine for oil leaks.