Variable Valve Timing Actuator: Service and Repair

VTC Actuator, Exhaust Camshaft Sprocket Replacement

1. Remove the cylinder head cover Cylinder Head Cover Removal.

2. Hold the camshaft with an open-end wrench, then loosen the VTC actuator mounting bolt and the exhaust camshaft sprocket mounting bolt.

NOTE: Do not remove the VTC actuator and the exhaust camshaft sprocket mounting bolts.






3. Set the No. 1 piston at top dead center (TDC). The punch mark (A) on the VTC actuator and the punch mark (B) on the exhaust camshaft sprocket should be at the top. Align the TDC marks (C) on the VTC actuator and the exhaust camshaft sprocket.






4. Remove the cam chain case cover.






5. Rotate the crankshaft counterclockwise and align the holes on the lock (A) and the cam chain auto-tensioner (B), then insert a 1.2 mm (3/64 in) diameter pin or lock pin (C) into the holes.






6. Turn the crankshaft clockwise to secure the pin and the TDC on the No.1 cylinder.

7. Loosen the rocker arm adjusting screws.

8. Remove the camshaft holder bolts.

9. Remove the five camshaft holders and cam chain guide B.

10. Carefully tip up the intake camshaft on the transmission side of the engine until there is enough slack in the chain to lift the chain off of the VTC gear.

11. Remove the intake and exhaust camshafts while keeping some tension on the cam chain.

12. Secure the cam chain to the A/C compressor suction hose or the power steering hose with the wire tie to prevent the chain from falling down into the cam chain case.

13. Remove the VTC actuator and the exhaust camshaft sprocket.

14. Install the VTC actuator and the exhaust camshaft sprocket.

NOTE: Install the VTC actuator while in the unlock position.

15. Apply new engine oil to the threads of the VTC actuator and the exhaust camshaft sprocket mounting bolts, then loosely install them.

16. Turn the VTC actuator clockwise until you hear it clock. Make sure to lock the VTC actuator by turning it.

17. Remove the wire tie while keeping light tension on the cam chain.

18. Slide the intake and exhaust camshafts in at an angle to allow the cam chain to slip over the VTC actuator's teeth and the exhaust sprocket's teeth.

19. Line up the marks made in step 3 for each cam.

20. Apply new engine oil to the camshaft journals and lobes on both cams, and reinstall the five camshaft holders and cam chain guide B in place.

21. Tighten the camshaft holder bolts to the specified torque.

22. Hold the camshaft with an open-end wrench, then tighten the bolts.










23. Remove the pin or lock pin from the cam chain auto-tensioner.






24. Remove all of the old liquid gasket from the cam chain case cover mating surfaces, the bolts, and the bolt holes.

25. Clean and dry the cam chain case cover mating surfaces.

26. Apply liquid gasket (P/N 08717-0004, 08718-0003, 08718-0004, or 08718-0009) to the cam chain case mating surface of the cam chain case cover and to the inside edge of the threaded belt holes. Install the component within 5 minutes of applying the liquid gasket.

NOTE:

- Apply a 3 mm (0.12 in) diameter bead of liquid gasket along the broken line (A).
- If you apply liquid gasket P/N 08718-0012, the component must be installed within 4 minutes.
- If too much time has passed after applying the liquid gasket, remove the old liquid gasket and residue, then reapply new liquid gasket.





27. Install the cam chain case cover.

NOTE:

- Wait at least 30 minutes before filling the engine with oil.
- Do not run the engine for at least 3 hours after installing the cam chain case.





28. Adjust the valve clearance Adjustments.

29. Install the cylinder head cover Cylinder Head Cover Installation.