Camshaft Replacement (In-Vehicle) - (Front Cover In Place)

- TOOLS REQUIRED
- J-43655 Camshaft Sprocket Holding Tool

NOTICE: The service tool J-43655 must be used to remove one or both camshafts at the same time. The engine's crankshaft can not be rotated with the camshaft(s) removed.





The L61 engine camshafts, rocker arms, lash adjustments, valve springs, and seals can be serviced without removing the exhaust system, vibration damper, front mount, or front cover. The following procedure must be followed to prevent damage to the camshafts, lash adjusters, cylinder head, and lower timing chain guides.

REMOVAL





1. Remove ignition coil, accessory drive belt, PCV fresh air hose, and cam cover assembly.

NOTICE: Engine must have No. 1 cylinder piston at top dead center (TDC) when removing and installing camshafts or timing chain, gears and chain guide(s) will be damaged when air pressure is put into the cylinder to hold valves closed.

2. Locate the piston in the No. 1 cylinder at top dead center (intake and exhaust valves closed).





3. Remove upper timing chain guide.





4. Remove timing chain tensioner.





5. Install J-43655 camshaft sprocket holding tool to cylinder head.
- Torque: 10 Nm (89 inch lbs.)





6. Hold each camshaft in place using a 24 mm open end wrench and carefully remove the camshaft timing sprocket retaining bolts and washers. Discard torque-to-yield (TTY) bolt.





7. Uniformly loosen and remove the rest of the camshaft bearing cap bolts in several places.





8. Slide camshaft sprockets away from camshafts.
9. Carefully pull camshafts straight up to avoid damaging cylinder head thrust surface when removing camshafts.

INSTALLATION





1. Lubricate camshaft bearing journals with clean engine oil and install both camshafts and all bearing caps, except the front cap on each camshaft. Tighten down bearing cap bolts uniformly.
- Torque: 10 Nm (89 inch lbs.)

IMPORTANT: Ensure that alignment notches are correctly aligned with notches in camshaft sprockets before final torque is applied.

IMPORTANT: Verify camshafts are properly timed as outlined in this section prior to starting engine.





2. Install new camshaft sprocket pilot bolts (one in each camshaft) and tighten. This will pull the camshaft sprockets into cams.
- Torque: 85 Nm + 30 degrees (63 ft. lbs. + 30 degrees)
3. Remove camshaft sprocket holding tool.
4. Install front remaining bearing caps.
- Torque: 10 Nm (89 inch lbs.)





5. Install rear intake camshaft bearing cap.
- Torque: 25 Nm (19 ft. lbs.)





6. Install cam cover assembly, PCV fresh air hoses, accessory drive belt, and ignition coil.