Rocker Arms & Camshafts

Removal & Installation

2.4L Engine

To Remove:

1. Remove the breather hose.
2. Remove the positive crankcase ventilation hose.
3. Remove the positive crankcase ventilation valve.
4. Remove the oil filler cap.
5. Remove the rocker cover and gasket.
6. Remove the upper oil seal.
7. Remove the lower oil seal.
8. When you remove the rocker arm from the rocker shaft (intake side and exhaust side), mark them to show the location to ensure correct installation of the rocker arm, the piston arm assembly, etc.
9. Remove the nuts.
10. Remove the adjusting screws.
11. Remove the rocker arm shaft assembly (intake side).
12. Remove the rocker arm "C".
13. Remove the piston arm assembly.
14. Remove the rocker arm "D".
15. Remove the rocker arm shaft (exhaust side).
16. Remove the engine oil control valve.
17. Remove the O-ring.
18. Remove the snap ring.
19. Remove the accumulator spring seat.
20. Remove the plunger spring.
21. Remove the accumulator plunger.
22. Remove the accumulator body.
23. Remove the taper plug.
24. Remove the engine oil control valve filter.
25. Remove the camshaft.

To Install:

1. Install the camshaft.
2. Install the engine oil control valve filter.
3. Install the taper plug.
4. Install the accumulator body.
5. Install the accumulator plunger.
6. Install the plunger spring.
7. Install the accumulator spring seat.
8. Install the snap ring.
9. When installing the O-ring and the engine oil control valve, do the following:
   • Step 1: Apply a little bit of clean engine oil onto the O-ring, then install it onto the engine oil control valve.

     CAUTION
     Do not reuse the O-ring. Before you install the O-ring, wrap sealing tape around the oil passages cut-out area of the engine oil control valve in order to prevent damage. If the O-ring is damaged, it can cause an oil leak.

   • Step 2: Install the engine oil control valve onto the cylinder head.
   • Step 3: Tighten the engine oil control valve to 98 in-lbs (11 Nm).
10. Install the rocker arm shaft (exhaust side).
11. Install the rocker arm "D".
12. Install the piston arm assembly.
13. Install the rocker arm "C".
14. Install the rocker arm shaft assembly (intake side).
15. Install the adjusting screw. When you install the screw onto the rocker arm, project it about 0.12 in (3 mm) from the face of the rocker arm end.
16. Install the nuts.
17. When installing the rocker arms and the rocker arm shafts (exhaust side), do the following:
    • Step 1: Install the rocker arm, and other parts, onto the rocker arm shaft in the correct places using the marks you made during removal.
    • Step 2: Install the rocker arm shaft with the oil hole onto the lower (cylinder head) side.
    • Step 3: Temporarily install the rocker arm and rocker arm shaft assembly (intake side).
    • Step 4: Temporarily install the rocker arm, and rocker arm shaft assembly (exhaust side).
    • Step 5: Make sure that the rocker arm and rocker arm shaft assembly are in position and then tighten to the correct torque as shown below:
      1. M6 bolt: 115 in-lb (13 Nm)
      2. M8 bolt: 23 ft-lb (31 Nm)
18. When installing the camshaft oil seal, apply clean engine oil to the lip of the oil seal and the front end outside diameter of camshaft. Use a camshaft oil seal installer (special tool #MD998713) to install the camshaft oil seal.
19. Install the other oil seal.
20. Install the rocker cover gasket and rocker cover.
21. Install the oil filler cap.
22. Install the positive crankcase ventilation valve.
23. Install the positive crankcase ventilation hose.
24. Install the breather hose.

3.8L Engine

To Remove:

1. Remove the breather hose.
2. Remove the blow-by hose.
3. Remove the positive crankcase ventilation hose.
4. Remove the positive crankcase ventilation valve.
5. Remove the oil filler cap.
6. Remove the rocker cover (left) and gasket.
7. Remove the rocker cover (right) and gasket.
8. Remove the oil seal.
9. Remove the camshaft oil seal.
10. Remove the rocker shaft cap.
11. When removing the rocker arms and shaft assembly, mark the parts to ensure correct positioning during installation.
12. Remove the rocker shaft cap.
13. When removing the rocker arms and shaft assembly, place the lash adjuster holder (special tool #MD998443) to keep the lash adjuster from falling off.

    CAUTION
    If you are reusing the lash adjuster, clean it before installing.

14. Remove the rocker arms and shaft intake.
15. Remove the nut and adjusting screw.
16. Remove the rocker arm "C".
17. Remove the piston arm assembly.
18. Remove the rocker arm "D".
19. Remove the rocker arm shaft.
20. Remove the lash adjuster.
21. Remove the right and left camshafts.

To Install:

CAUTION
Be careful not to confuse the right and left bank camshafts.

1. When installing the left and right camshafts, apply clean engine oil onto the camshaft journals and cams and then install the camshafts.

   NOTE: The longer camshaft is for the left bank.

2. Make sure the dowel pin of the camshaft is in the position shown.

   Camshaft installation (3.8L)

   CAUTION
   If you are reusing the lash adjuster, clean it before installation.

3. When installing the lash adjuster, fit it onto the rocker arm without letting fuel spill out. Place the lash adjuster holder (special tool #MD998443) to keep the lash adjuster from falling off.
4. Install the rocker arm shaft.
5. Install the rocker arm "D".
6. Install the piston arm assembly.
7. Install the rocker arm "C".
8. When installing the adjusting screw and nut, first temporarily install the screw onto the rocker arm and project it about 0.12 in (3 mm) from the same face level of the rocker arm end.
9. Install the rocker arms and shaft intake.
10. To install the rocker arms and shaft assembly, do the following:
    • Step 1: Put each rocker arm shaft with the side having the oil holes of the illustrated shape facing down toward the cylinder head.
    • Step 2: Check that the oil holes on each rocker arm shaft are in the positions shown.

      NOTE: There are four bolt holes in each of the intake rocker arm shafts.

    • Step 3: Check that the notch on each exhaust side rocker arm shaft is at the position shown in the illustration.

      NOTE: There are six bolt holes in each of the exhaust rocker arm shafts.

    • Step 4: According the location notes you made during removal, correctly install the rocker arms and other parts on each of the rocker arm shafts.
    • Step 5: When you install the rocker arm shaft, make sure the identification marks are in the positions shown.

    • Step 6: Tighten the intake rocker arm shaft bolts to 115 in-lbs (13 Nm).
    • Step 7: Tighten the exhaust rocker arm shaft bolts to 115 in-lbs (13 Nm).
    • Step 8: Remove the lash adjuster holder (special tool #MD998443).
11. Install the rocker shaft cap.
12. When installing the camshaft oil seal, apply clean engine oil to the lip of the oil seal and the front end outside diameter of camshaft. Use a camshaft oil seal installer (special tool #MD998713) to install the camshaft oil seal.
13. Install the oil seal.
14. Install the rocker cover gasket.
15. Install the rocker cover (right).
16. Install the rocker cover gasket.
17. Install the rocker cover (left).
18. Install the oil filler cap.
19. Install the positive crankcase ventilation valve and hose.
20. Install the blow-by hose.
21. Install the breather hose.