Variable Valve Timing Camshaft Phasers, Left
Variable Valve Timing Camshaft Phasers, Left
Special tools, testers and auxiliary items required
• Dial indicator
• Timing Chain Holder (10200)
• Camshaft Phaser Lock (10202)
Removing
The magnetic timing wheels (1) must not come in contact with magnets (pickup tools, trays, etc.) or any other strong magnetic field. This will destroy the timing wheels ability to correctly relay camshaft position to the camshaft position sensor.
- Remove the upper intake manifold and left cylinder head cover. Refer to => [ Left Cylinder Head Cover ] Left Cylinder Head Cover.
- Remove the RH ignition coils. Refer to => [ Ignition Coil ] Service and Repair.
- Remove the spark plugs. Refer to => [ Spark Plug ] Service and Repair.
When aligning timing marks, always rotate engine by turning the crankshaft. Failure to do so will result in valve and/or piston damage.
- Mount dial indicator (1) to a stationary point on the engine. Rotate the crankshaft CW to place the number one piston at TDC on the exhaust stroke.
- The left side cam phaser arrows (2) should point toward each other and be parallel to the valve cover sealing surface (5) when the number one piston is positioned at TDC on the exhaust stroke.
• Minor rotation of a camshaft (a few degrees) may be required when installing the camshaft phaser lock.
- Install the LH camshaft phaser lock (10202) (4).
- Mark the cam chain at the phaser timing marks (1) using a paint pen or equivalent to aid in reassembly.
- Loosen the intake oil control valve (6) and the exhaust oil control valve (2).
- Remove the LH camshaft phaser lock (10202) (4).
• Graphic shows engine timing cover removed for clarity.
- Using timing chain holder (10200) (1), lift the pawl off of the rack (2). While holding the pawl off of the rack, push timing chain holder (10200) (1) into place between the cylinder head and the cam chain guide to force the rack and piston back into the tensioner body. The holder remains in place while the phasers are removed. Refer to => [ Resetting Left Cam Chain Tensioner ] Resetting Left Cam Chain Tensioner.
- Remove the oil control valve (3) and pull the left side exhaust cam phaser off of the camshaft.
- Remove the oil control valve (2) and pull the left side intake cam phaser off of the camshaft.
Installing
The magnetic timing wheels (1) must not come in contact with magnets (pickup tools, trays, etc.) or any other strong magnetic field. This will destroy the timing wheels ability to correctly relay camshaft position to the camshaft position sensor.
Do not rotate the crankshaft more than a few degrees independently of the camshafts. Piston to valve contact could occur resulting in possible valve damage. If the crankshaft needs to be rotated more than a few degrees, first remove the camshafts. Refer to => [ Left Camshafts ] Left Camshafts
- Verify that the number one piston is positioned at TDC on the exhaust stroke.
Do not rotate the camshafts more than a few degrees independently of the crankshaft. Valve to piston contact could occur resulting in possible valve damage. If the camshafts need to be rotated more than a few degrees, first move the pistons away from the cylinder heads by rotating the crankshaft counterclockwise to a position 30° BTDC. Once the camshafts are positioned at TDC rotate the crankshaft clockwise to return the crankshaft to TDC.
- Verify that the camshafts are set at TDC by positioning the alignment holes (1) vertically.
- Reset the LH cam chain tensioner with the timing chain holder (10200) (1). The timing chain holder (10200) remains in place while the phasers are removed. Refer to => [ Resetting Left Cam Chain Tensioner ] Resetting Left Cam Chain Tensioner.
- Route the cam chain around the LH intake cam phaser while aligning the paint mark with the phaser timing mark (1). Press the LH intake cam phaser onto the inlet camshaft. Install and hand tighten the oil control valve (6).
- While maintaining this alignment, route the cam chain around the exhaust cam phaser so that the paint mark is aligned with the phaser timing mark (1). Press the exhaust cam phaser onto the exhaust cam, install and hand tighten the oil control valve (2). The arrows (3) on the cam phasers should point toward each other and be parallel to the valve cover sealing surface (5).
• Minor rotation of a camshaft (a few degrees) may be required to install the camshaft phaser or phaser lock.
- Install the LH camshaft phaser lock (10202) (4) and tighten the oil control valves (2) and (6) to 150 Nm (110 ft. lbs.).
- Remove the LH camshaft phaser lock (10202) (4) and the timing chain holder (10200).
- Rotate the crankshaft CW two complete revolutions stopping when the number one piston is again positioned at TDC on the exhaust stroke.
- While maintaining this alignment, verify that the arrows on the left side cam phasers (3) point toward each other and are parallel to the valve cover sealing surface (5).
- There should be 12 chain pins (2) between the exhaust cam phaser triangle marking (1) and the intake cam phaser circle marking (3).
- If the engine timing is not correct, repeat this procedure.
- Install the spark plugs. Refer to => [ Spark Plug ] Service and Repair.
- Install the RH ignition coils. Refer to => [ Ignition Coil ] Service and Repair.
- Install the left cylinder head cover. Refer to => [ Left Cylinder Head Cover ] Left Cylinder Head Cover.
- Install the upper intake manifold and air cleaner housing assembly. Refer to => [ Upper Intake Manifold ] Upper Intake Manifold.
- Connect the negative battery cable.
• The Cam/Crank Variation Relearn procedure must be performed using the scan tool anytime there has been a repair/replacement made to a powertrain system, for example: flywheel, valvetrain, camshaft and/or crankshaft sensors or components.