Valve Lash Adjustment
Tools Required
- J 26900-13 Magnetic Indicator Base
- J 8001 Dial Indicator Set
- J 45785-1 Valve Spring Compressor. See «Special Tools»(ref-200079-S33867661992005102000000) .
| IMPORTANT | Valve clearance measurement should only be done on a cold engine. To change the valve clearance on a given valve, the valve shim must be replaced by one that is thicker or thinner in size. Valve shims are available in 41 different sizes, in increments of 0.020 mm (0.0008 in). Valve shims range in size from 2.000 mm (0.0787 in) to 2.800 mm (0.1102 in). |
- Remove the cylinder head cover. Refer to «Cylinder Head Cover Replacement»(ref-200079-S15953691062005102000000) .
- Turn the crankshaft clockwise until the alignment notch on the crankshaft pulley is aligned with the "0" mark on the engine front cover tab.
- Check that the point marks on the camshaft gears are aligned. If the point marks on the camshaft gears are not aligned, turn the crankshaft clockwise one revolution in order to align the camshaft gears.
- Using a feeler gage, measure the clearance between the intake valve shims and the intake camshaft for cylinders #1, and #2. Intake Valve Clearance (Cold): 0.08-0.18 mm (0.0031-0.0071 in)
- Using a feeler gage, measure the clearance between the exhaust valve shims and the exhaust camshaft for cylinders #1, and #3. Exhaust Valve Clearance (Cold): 0.22-0.32 mm (0.0087-0.0126 in) IMPORTANT: Record any out of specification valve clearance measurements. The measurements will be used later to determine the required replacement shim.
- Turn the crankshaft clockwise 1 revolution until the alignment notch on the crankshaft pulley is aligned with the "0" mark on the engine front cover tab.
- Using a feeler gage, measure the clearance between the intake valve shims and the intake camshaft for cylinders #3, and #4. Intake Valve Clearance (Cold): 0.08-0.18 mm (0.0031-0.0071 in)
- Using a feeler gage, measure the clearance between the exhaust valve shims and the exhaust camshaft for cylinders #2, and #4. Exhaust Valve Clearance (Cold): 0.22-0.32 mm (0.0087-0.0126 in) IMPORTANT: Record any out of specification valve clearance measurements. The measurements will be used later to determine the required replacement shim.
- If there were any valve clearances that were out of specifications, the valve shims must be replaced.
Valve Clearance Adjustment
- Turn the crankshaft so the related rocker arm, where the valve clearance is to be adjusted, is fully pushed down.
- Install J 45785-1 onto the spark plug tube.
- Operate the lever on J 45785 so the tool seat surface comes to contact with the valve retainer and lock them with the set screw.
- Lock the set screw on the spark plug tube side of J 45785 .
- Rotate the crankshaft so the camshaft is positioned as shown.
- Using J 45785-2 , lift the rocker arm and remove the valve adjusting shim.
Camshaft Actuator Locking Pin Adjustment
- Ensure the timing marks (1) on the camshaft gears and the line on the phaser body (2) are aligned with the yellow links (3) on the timing chain.
- Remove the front camshaft journal cap (1), to access the internal camshaft oil galleys.
- To expose the oil galley (1), needed to unlock the internal actuator lock pin, rotate the engine until the no. 1 intake cam lobes face down (2).
- Loosen the cam actuator retaining bolt two turns, then ensure the actuator is unseated from the intake camshaft.
- Apply shop air to the oil galley (1).
- While applying air pressure to the oil galley (1), turn the camshaft (2), backwards and forwards until the locking pin releases and the camshaft moves toward the from the engine.
- When the actuator releases, hold the camshaft (1), and tighten the camshaft actuator sprocket bolt to specification to prevent the actuator from locking. Tighten: Tighten the camshaft actuator sprocket bolt to 55 N.m (40 lb ft).
- Check to ensure the actuator is still unlocked.