Camshaft

Removal & Installation

2.4L Engine

To Remove:

1. Remove the air cleaner.
2. Remove the Timing Belt.
3. Disconnect the ignition coil connector.
4. Remove the spark plug cable.
5. Remove the ignition coil.
6. Remove the PCV hose.
7. Remove the breather hose.
8. Disconnect the control harness connector.
9. Remove the rocker cover.
10. Remove the camshaft position sensor support.
11. Remove the camshaft position sensing cylinder.
12. To remove the camshaft sprocket:
    • Step 1: Use special tools #MB990767 and #MD998719 to loosen the camshaft sprocket securing bolt.
    • Step 2: Remove the camshaft sprocket.
13. Remove the spark plug guide oil seal.
14. To remove the rocker arm and shaft assembly on the intake side and on the exhaust side, do the following:
    • Step 1: Use special tool #MD998443 as seen in the illustration so that the lash adjusters will not fall out.

      Special tool #MD998443

      CAUTION
      Do not disassemble the rocker arm and shaft assembly.

    • Step 2: Loosen the rocker arm and shaft assembly mounting bolt, then remove the rocker arm and shaft assembly with the bolt attached.
15. Remove the camshaft.
16. Remove the camshaft sprocket.
17. Remove the camshaft oil seal.

To Install:

1. Install the camshaft oil seal.
2. Install the camshaft sprocket.
3. Install the camshaft.
4. Install the rocker arm and shaft assembly on the exhaust side and the intake side.
5. Install the spark plug guide oil seal.
6. Install the camshaft sprocket.
7. Install the camshaft position sensing cylinder.
8. Install the camshaft position sensor support.
9. Install the rocker cover.
10. Connect the control harness connection.
11. Install the breather hose.
12. Install the PCV hose.
13. Install the ignition coil.
14. Install the spark plug cable.
15. Connect the ignition coil connector.

3.0L 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 oil seal and camshaft oil seal.
7. Remove the rocker shaft cap.

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

   Special tool #MD998443

8. When removing the rocker arms and shafts, use a lash adjuster holder (special tool #MD998443) to keep the lash adjuster from falling off.
9. Remove the rocker shaft spring.
10. Remove the rocker arm A and rocker arm B.
11. Remove the rocker arm shaft.
12. Remove the lash adjusters.
13. Remove rocker arm C.
14. Remove the rocker arm shaft.
15. Remove the harness bracket.
16. Remove the thrust case (left bank only).
17. Remove the O-ring (left bank only).
18. Remove the camshaft.

To Install:

1. When installing the camshaft, put clean engine oil onto the camshaft journals and cams. The camshaft for the right bank has a slit for driving the distributor at the rear end. The camshaft for the left bank does not have a slit. Make sure you install the proper camshaft in the correct position.
2. Install the O-ring (left bank only).
3. Install the thrust case (left bank only).
4. Install the harness bracket.

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

5. When installing the lash adjusters, put the lash adjuster onto the rocker arm making sure not to let any fuel spill out. Put on the lash adjuster holder (special tool MD998443) to keep the lash adjuster from falling off.
6. Install the rocker arm shafts.
7. Install the rocker arm C.
8. Install rocker arm B.
9. Install rocker arm A.
10. When installing the rocker shaft spring, rocker arms, and rocker arm shafts, do the following:
    • Step 1: Turn the camshaft until the dowel pin on its front end is positioned as illustrated.

      NOTE: Put the camshaft in the position shown to minimize the amount of cam lift, which makes it easier to install the rocker arm and shaft assemblies.

    • Step 2: Install the exhaust side rocker arm C and shaft assembly to the cylinder head.
    • Step 3: Install the inlet side rocker arms A and B and the shaft assembly onto the cylinder head.

      Rocker shaft spring (3.0L)

    • Step 4: Insert the rocker shaft spring to the intake side rocker arm shaft as shown.

      Rocker arm shaft notch (3.0L)

    • Step 5: Be sure the notch in the end of the rocker arm shaft is facing the direction shown in the illustration.
11. Install the rocker shaft cap.
12. When installing the camshaft oil seal, do the following:
    • Step 1: Put a small amount of clean engine oil onto the lip of the oil seal and the front end outside diameter of the camshaft.
    • Step 2: Use a camshaft oil seal installer (special tool #MD998713) and a camshaft oil seal installer adaptor (special tool #MB991559) (for the left bank only) to install the camshaft oil seals.
13. Install the oil seal.
14. Install the rocker cover gasket and rocker cover.
15. Install the oil filler cap.
16. Install the positive crankcase ventilation valve.
17. Install the positive crankcase ventilation hose.
18. Install the breather hose.