Valve Clearance
CAUTION:
DO NOT rotate crankshaft counterclockwise as viewed from front of engine.
NOTE:
Adjust valves with engine cold.
- Disconnect negative battery cable. Wait at least 90 seconds to allow air bag system back-up power supply to be depleted. Drain engine coolant. Disconnect radiator inlet hose. Disconnect accelerator cable and transmission throttle valve cable from throttle linkage. Remove airflow meter, air cleaner and intake air hose as an assembly.
- Remove "V" bank cover (center valley cover) from top of engine. Remove emission control valve assembly located above center valley. Disconnect electrical connectors and hoses as necessary and remove air intake chamber. Disconnect engine wiring harness.
- Disconnect electrical connectors from ignition coils and fuel injectors. Remove ignition coils (set them aside in the correct order so they can be installed in the same place). Remove spark plugs. Remove cylinder head covers.
- Set cylinder No. 1 at TDC of compression stroke (rotate crankshaft until pulley groove is aligned with "0" mark on timing belt cover). Ensure cylinder No. 1 intake valve lifters are loose and exhaust valve lifters are tight. See Fig 1-3. If lifters are not as specified, rotate crankshaft 360 degrees.
- Measure and record clearance on intake valves of cylinders No. 1 and 6, and exhaust valves of cylinders No. 2 and 3. See Fig 1-3. Rotate crankshaft 240 degrees (2/3 of a revolution). Measure and record clearance on intake valves of cylinders No. 2 and 3, and exhaust valves of cylinders No. 4 and 5.
- Rotate crankshaft pulley another 240 degrees (2/3 of a revolution). Measure and record clearance on intake valves of cylinders No. 4 and 5, and exhaust valves of cylinders No. 1 and 6.
- Compare measured clearance with specified clearance. See VALVE CLEARANCE SPECIFICATIONS table. If clearance is within specification, go to step 11). If clearance is not within specification, rotate crankshaft until camshaft lobe of valve to be adjusted is facing upward, away from shim.VALVE CLEARANCE SPECIFICATIONS
Application In. (mm) Intake .006-.010 (.15-.25) Exhaust .010-.014 (.25-.36) - Using a screwdriver, rotate valve lifter until notch is at a 90-degree angle to camshaft (perpendicular), facing centerline of cylinder head. Using Valve Lifter Press (SST 09248-05410), press valve lifter downward. See Fig 4.
- Position Valve Lifter Stopper (SST 09248-05420) between camshaft and valve lifter to keep valve lifter held down. Remove valve lifter press. Using a small screwdriver and magnet, remove shim. Select a shim of appropriate thickness. See SELECTING SHIMS at end of VALVE CLEARANCE .
- Place shim onto valve lifter with imprinted numbers facing down. Press downward on valve lifter using valve lifter press, and remove valve lifter stopper. Recheck valve clearance to ensure it is correct.
- To install remaining components, reverse removal procedure. Use NEW gaskets at air intake chamber. Tighten nuts and bolts to specification. See TORQUE SPECIFICATIONS .