In Vehicle

IN VEHICLE

Special Tools:











CAUTION: The magnetic timing wheels (1) must not come in contact with magnets (pickup tools, trays, etc.) or any other strong magnetic field. This will destroy the timing wheels ability to correctly relay camshaft position to the camshaft position sensor.





1. Disconnect and isolate the negative battery cable.
2. If removing the LH exhaust valve springs, recover the refrigerant from the refrigerant system and remove the A/C suction and liquid line assembly (1) A/C Suction Line - Removal.






NOTE: Power steering pump not shown.

3. If removing the LH exhaust valve springs, remove the nut (1) and bolt (4) from the support brackets of the heater core return tube (3) and reposition the tube.





4. If removing the RH valve springs, remove the transmission fluid level indicator tube (2) . NAG1 Automatic Transmission
5. Remove both cylinder head covers Cylinder Head Cover(s) - Removal






NOTE: The LH cylinder head rocker arms are shown, the RH cylinder head rocker arms are similar.

NOTE: Only remove the camshafts from one head at a time. The opposite head must remain assembled in order to lock the crankshaft against rotation.

6. Remove the camshaft(s) Camshaft - Removal.

NOTE: If the rocker arms are to be reused, identify their positions so that they can be reassembled into their original locations.

7. Remove the rocker arm(s) (1) Valve Rocker Arm - Removal.






NOTE: RH camshaft phaser lock shown, LH camshaft phaser lock similar.

CAUTION: Air pressure applied to the cylinder holds the valves in place. This air pressure also has a tendency to force the piston down and rotate the crankshaft. Do not allow the crankshaft to rotate. Crankshaft rotation may damage the timing chain or front timing cover and affect camshaft timing.

8. If removing the LH camshafts, install the RH Camshaft Phaser Lock -1 (5) to lock the crankshaft against rotation. If removing the RH camshafts, install the LH Camshaft Phaser Lock -2 to lock the crankshaft against rotation.






NOTE: Number 4 cylinder intake valve spring compression shown, all other valves similar.

9. Remove the spark plug . Spark Plug - Removal
10. Install Valve Spring Compressor (2) onto the cylinder head.
11. Install a spark plug adapter attached to a regulated shop air supply (1). Pressurize the cylinder being serviced to 620.5 - 689 kPa (90 - 100 psi) to hold the valves in place.

CAUTION: Air pressure must be maintained as long as the valve springs are removed to prevent the valves from dropping into the cylinders.

12. Using Valve Spring Compressor Adapter (3), compress valve spring (4) and remove valve retaining locks (5).






NOTE: If the springs are to be reused, identify their positions so that they can be reassembled into their original locations. Number 5 cylinder exhaust valve spring shown, all other valve springs similar.

13. Release the valve spring compression and remove the valve spring retainer (1) and valve spring (2).
14. If required, remove the valve guide seal and spring seat Valve Guide Seals - Removal.