Timing Drive Components: Removal
- Remove the engine front cover. For additional information, refer to ENGINE FRONT COVER .
- Remove the crankshaft sensor ring from the crankshaft.
- Position the crankshaft keyway at the 12 o'clock position.
- The No. 1 cylinder camshaft exhaust lobe must be coming up on the exhaust stroke. Verify by noting the position of the 2 intake camshaft lobes and the exhaust lobe on the No. 1 cylinder.
- Remove only the 3 camshaft roller followers shown in Fig 4 from the RH cylinder head.
- Using the special tool, remove the 3 designated camshaft roller followers in the previous step from the RH cylinder head.
- Remove only the 3 camshaft roller followers shown in Fig 6 from the LH cylinder head.
- Using the special tool, remove the 3 designated camshaft roller followers in the previous step from the LH cylinder head.
- Rotate the crankshaft clockwise and position the crankshaft keyway at the 6 o'clock position or engine damage may occur.
- Remove the bolts, the LH timing chain tensioner and tensioner arm.
- Remove the bolts, the RH timing chain tensioner and tensioner arm.
- Remove the RH and LH timing chains and the crankshaft sprocket.
- Remove the RH timing chain from the camshaft sprocket.
- Remove the RH timing chain from the crankshaft sprocket.
- Remove the LH timing chain from the camshaft sprocket.
- Remove the LH timing chain and crankshaft sprocket.
- Remove the LH and RH timing chain guides.
- Remove the bolts.
- Remove both timing chain guides.
- Damage to the variable camshaft timing (VCT) phaser sprocket assembly will occur if mishandled or used as a lifting or leveraging device.
- Only use hand tools to remove the VCT phaser sprocket assembly or damage may occur to the camshaft or VCT phaser sprocket or damage may occur to the camshaft or camshaft phaser and sprocket.
- Using the special tool, remove the bolt and the RH VCT phaser sprocket assembly.
- Discard the VCT phaser sprocket bolt.
- Damage to the VCT phaser sprocket assembly will occur if mishandled or used as a lifting or leveraging device or damage may occur to the camshaft or camshaft phaser and sprocket.
- Only use hand tools to remove the VCT phaser sprocket assembly or damage may occur to the camshaft or VCT phaser sprocket.
- Using the special tool, remove the bolt and the LH VCT phaser sprocket assembly.
- Discard the VCT phaser sprocket bolt.
- Remove the bolts in the sequence shown in Fig 15 and remove the RH cylinder head front camshaft bearing cap and then the remaining bearing caps.
- Clean and inspect the RH camshaft bearing caps.
- The camshaft front thrust bearing cap contains an oil metering groove. Make sure the groove is free of foreign material.
- Remove the RH camshaft.
- Remove the bolts in the sequence shown in Fig 17 and remove the LH cylinder head front camshaft bearing cap and then the remaining bearing caps.
- Clean and inspect the LH camshaft bearing caps.
- The camshaft front thrust bearing cap contains an oil metering groove. Make sure the groove is free of foreign material.
- Remove the LH camshaft.
- Remove all of the remaining camshaft roller followers from the cylinder heads.
NOTE:
If the camshaft lobes are not exactly positioned as shown in Fig 3, the crankshaft will require one full additional rotation to 12 o'clock.
CAUTION:
If the components are to be reinstalled, they must be installed in the same positions. Mark the components for installation into the original locations. Failure to follow these instructions may result in engine damage.
CAUTION:
Do not allow the valve keepers to fall off the valve or the valve may drop into the cylinder. If a valve drops into the cylinder, the cylinder head must be removed. For additional information, refer to Cylinder Head .
NOTE:
It may be necessary to push the valve down while compressing the spring.
CAUTION:
If the components are to be reinstalled, they must be installed in the same positions. Mark the components for installation into the original locations. Failure to follow these instructions may result in engine damage.
CAUTION:
Do not allow the valve keepers to fall off the valve or the valve may drop into the cylinder. If a valve drops into the cylinder, the cylinder head must be removed. For additional information, refer to Cylinder Head .
NOTE:
It may be necessary to push the valve down while compressing the spring.
CAUTION:
The crankshaft cannot be moved past the 6 o'clock position once set.
CAUTION:
If one or both of the tensioner mounting bolts are loosened or removed, the tensioner-sealing bead must be inspected for seal integrity. If cracks, tears, separation from the tensioner body or permanent compression of the seal bead is observed, install a new tensioner or engine damage may occur.
CAUTION:
If one or both of the tensioner mounting bolts are loosened or removed, the tensioner-sealing bead must be inspected for seal integrity. If cracks, tears, separation from the tensioner body or permanent compression of the seal bead is observed, install a new tensioner or engine damage may occur.
NOTE:
RH shown, LH similar.
CAUTION:
CAUTION:
CAUTION:
When removing the front thrust camshaft bearing cap, use care as the cap may be damaged from sideloading when removing the cam unequally in height from the bearing towers.
NOTE:
The camshaft bearing caps must be installed in their original locations. Record camshaft bearing cap locations. Failure to follow these instructions may result in engine damage.
CAUTION:
When removing the front thrust camshaft bearing cap, use care as the cap may be damaged from sideloading when removing the cam unequally in height from the bearing towers.
NOTE:
The camshaft bearing caps must be installed in their original locations. Record camshaft bearing cap locations. Failure to follow these instructions may result in engine damage.
CAUTION:
If the components are to be reinstalled, they must be installed in the same positions. Mark the components for installation into the original locations. Failure to follow these instructions may result in engine damage.