Camshaft and Valve Lifters

REMOVAL & INSTALLATION

1998

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Remove or disconnect the following:
   • Negative battery cable
   • Timing belt covers
   • Timing belt
   • Camshaft sprockets
   • Spark plug wires
3. On the left cylinder head, remove the Camshaft Position (CMP) sensor.
4. Remove the valve covers and gaskets

   Fig. 2: Camshaft bearing cap removal sequence — exhaust camshaft shown, intake camshaft is the same

5. Loosen the intake camshaft cap bolts in sequence, in small increments.

   NOTE: Be sure to keep the intake and exhaust bearing caps and camshafts in proper order for assembly. Also note the positioning and location of the camshafts for reinstallation.

6. Remove or disconnect the following:
   • Intake camshaft bearing caps, then the camshaft

   NOTE: When removing the exhaust camshaft, the valve lifter and valve shim may fall out. Have an assistant help keep the lifters and shims in the proper order.

7. Exhaust camshaft cap bolts, loosen them, in sequence, in small increments
8. Exhaust camshaft bearing caps
9. Camshafts

   To install:

   NOTE: Lubricate the camshaft bearings prior to camshaft installation.

10. Install the camshafts so the base circle (non-lobe portion) of the camshafts are in contact with the lash adjusters. This will position the lobes of the camshafts away from the valves.

    NOTE: The left camshaft will need to be rotated for timing belt alignment.

    Fig. 3: Cutaway view of the camshaft positioning

    Fig. 4: Camshaft bearing cap tightening sequence — intake camshaft shown, exhaust camshaft order is the same

    Fig. 5: Apply the fluid packing as shown to prevent oil leaks

11. Apply Three Bond® 1215 fluid packing to the front bearing cap mating surfaces.
12. Install or connect the following:
    • Bearing caps. Torque the caps in sequence in 2 progressive steps to 14 ft. lbs. (20 Nm).
    • New oil seals in the cylinder heads using a seal installation tool.

    WARNING
    Only rotate camshafts the specified amount. If the camshafts are rotated beyond the specified amount, the valves will contact each other and cause severe internal damage.

13. For correct timing belt alignment, rotate the left-hand intake camshaft 80 degrees clockwise and the left-hand exhaust camshaft 45 degrees counterclockwise.
14. If new camshafts were installed, check and adjust the valve lash.
15. Install or connect the following:
    • Valve covers using a new gasket be sure to apply liquid sealant to the front edges of the gasket at the camshaft opening. Torque the bolts to 3.6 ft. lbs. (5 Nm).
    • CMP sensor, if removed
    • Spark plug wires
    • Camshaft sprockets. Torque the retaining bolts to 58 ft. lbs. (78 Nm). Be sure to secure the sprockets when tightening the bolts.

    NOTE: Check the timing sprockets for proper alignment

    • Timing belt
    • Negative battery cable
16. Check the fluid levels and start the engine.
17. Allow the engine to reach operating temperature and check for leaks

1999–01

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Remove or disconnect the following:
   • Negative battery cable
   • Timing belt covers
   • Timing belt
   • Camshaft sprockets
   • Spark plug wires
   • Oil level gauge guide and Camshaft Position (CMP) sensor support
   • Positive Crankcase Ventilation (PCV) hose
   • Valve cover
   • Rocker arm assembly
3. Remove the camshaft cap as follows:
   1. Bolts "A" through "B" in alphabetical sequence
   2. Loosen bolts "C" through "J" equally all the way in alphabetical sequence
   3. Bolts "K" through "P" in alphabetical sequence using tool 499497000
4. Remove or disconnect the following:
   • Camshaft
   • Oil seal, if necessary
   • Plug from the rear side of the camshaft

     Fig. 6: Camshaft cap removal sequence

   To install:

   NOTE: Lubricate the camshaft bearings prior to camshaft installation.

5. Install or connect the following:
   • Camshaft
   • Camshaft cap. Apply liquid gasket on the edge of the cam cap mating surface 0.12 inch (3mm) thick
6. Temporarily tighten bolts "G" through "J" in alphabetical sequence
7. Install the valve rocker assembly. Torque the bolts "A" through "H" to 18 ft. lbs. (25 Nm).
8. Torque bolts "I" through "N" to 13 ft. lbs. (25 Nm) in alphabetical sequence using tool 499497000
9. Torque bolts "O" through "X" to 7.2 ft. lbs. (10 Nm) in alphabetical sequence
10. Install or connect the following:
    • Oil seal to the camshaft using tool 499597000 oil seal guide and 49958700 oil seal installer
    • Plug to the rear side of the camshaft using tool 499587700 oil seal installer
    • Valve cover
    • Oil level gauge guide and CMP sensor support
    • PCV house
    • Spark plug wires
    • Camshaft sprockets. Torque the bolts to 58 ft. lbs. (78 Nm).
    • Timing belt
    • Timing belt covers. Torque the bolts to 3.6 ft. lbs. (5 Nm).
    • Negative battery cable

      Fig. 7: Camshaft cap tightening sequence