Valve Clearance: Testing and Inspection
NOTE: Inspect and adjust the valve clearance when the engine is cold.1. Drain engine coolant.
2. Remove throttle body.
3. Disconnect engine wire and heater valve from cowl panel.
(a) Remove the 2 bolts and disconnect the ground strap and engine wire.
(b) Remove the 2 bolts and disconnect the heater valve.
4. Disconnect high-tension cords from spark plugs.
5. Remove cylinder head cover.
Remove the 13 bolts, cylinder head cover and gasket.
6. Set No. 1 cylinder to Top Dead Center (TDC)/Compression.
(a) Turn the crankshaft pulley clockwise and align its groove with the timing mark "0" on the timing chain cover.
(b) Check that the timing marks (one and two dots) of the camshaft drive and driven gears are in straight line on the cylinder head surface as shown in the illustration.
If not, turn the crankshaft 1 revolution (360°) and align the marks as above.
7. Inspect valve clearance.
(a) Check only the valves indicated.
^ Using a feeler gauge, measure the clearance between the valve lifter and camshaft.
^ Record the out-of-specification valve clearance measurements. They will be used later to determine the required replacement adjusting shim.
Valve clearance (Cold):
Intake: 0.15 - 0.25 mm (0.006 - 0.010 inch)
Exhaust: 0.25 - 0.35 mm (0.010 - 0.014 inch)
(b) Turn the crankshaft pulley 1 revolution (360°) and align its groove with timing mark "O" of the timing chain cover.
(c) Check only the valves indicated as shown. Measure the valve clearance. (See procedure in step (a))
8. Adjust valve clearance.
9. Reinstall cylinder head cover.
(a) Install the gasket to the cylinder head cover.
(b) Install the cylinder head cover with the 13 bolts.
10. Reinstall high-tension cords to spark plugs.
11. Reconnect heater valve and engine wire to cowl panel.
(a) Connect the heater valve with the 2 bolts.
(b) Connect the ground strap and engine wire with the 2 bolts.
12. Reinstall throttle body.
13. Refill radiator with engine coolant.
14. Check and adjust ignition timing.