Removal And Installation: Camshaft

REMOVAL 

1. Disconnect the negative battery cable.
2. Remove the cylinder head cover. Refer to COVER(S), CYLINDER HEAD, REMOVAL AND INSTALLATION .

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3. Assemble the (special tool #2027207090, Tab, 90 Degree) (1) and (special tool #2027204090, Adapter, Stand-Off) (2) with the (special tool #2027212090, Bolt, Stand-Off Adapter) (3) to the (special tool #10259B, Compressor, MultiAir® Spring) (4) or the UNIAIR Module Compression Plate 2020000090.

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4. Position the tool (1a) and tighten the screws (1b) to compress the springs on the Variable Valve Actuation Assembly (VVAA).

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5. Remove the cap (1) from the timing chain cover.

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6. Using a suitable tool (1a) press the cam chain tensioner arm to retract the piston of the cam chain tensioner and lock it in the retracted position with the (special tool #8514A, Pins, Tensioner) (1b).

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7. Temporarily secure the cam chain (1a) to the camshaft sprocket (1b) as shown in the illustration.

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8. Use the wrench flats to hold the camshaft (1a) and loosen the bolt (1b) on the camshaft sprocket (1c).
9. Remove the camshaft sprocket from the camshaft and rest it on the inner rib of the engine timing chain cover.

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   NOTE:

   To avoid bending the camshaft, partially loosen each cam cap bolt, one turn at a time, to remove the camshaft caps.

10. Remove the bolts (1a) and remove the camshaft caps (1b).

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11. Remove the camshaft (1) from the cylinder head.

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12. Check the integrity of the snap ring (1a) and the centering bushing (1b).
13. If required, use a suitable hydraulic press to remove the bearing from the camshaft.

INSTALLATION 

1. If removed, use a suitable hydraulic press and install the bearing on the camshaft.

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   NOTE:

   To avoid bending the camshaft, partially tighten each cam cap bolt, one turn at a time, to seat the camshaft to the head. Do not torque to specification until the cam caps are in full contact with the cylinder head.

2. Position the camshaft in the cylinder head, install the camshaft bearing caps (1a) and bolts (1b).
   Fig 1: Camshaft Bearing Cap Tightening Sequence

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3. Tighten the bolts in the sequence shown to the proper specification Refer to TORQUE SPECIFICATIONS  .

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4. Align the camshaft bushing (1) and install the camshaft sprocket.

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5. Use the wrench flats to hold the camshaft (1a) and tighten the new bolt (1b) on the camshaft sprocket (1c) to the proper specification Refer to TORQUE SPECIFICATIONS  .
6. Remove the temporary securing of the cam chain to the camshaft sprocket.
7. Remove the cam chain tensioner locking pin.
8. Install the cap to the timing chain cover and tighten securely.
9. Remove the tools used to compress the springs on the VVAA.
10. Install the cylinder head cover. Refer to COVER(S), CYLINDER HEAD, REMOVAL AND INSTALLATION .
11. Connect the negative battery cable.