Valve Clearance: Adjustments
INSPECTION
CAUTION: Inspection and adjustment of valve clearance should be performed while engine is cold.
1) Set the vehicle onto the lift.
2) Disconnect battery ground cable.
3) Remove timing belt cover (RH).
4) Remove rocker cover.
- When inspecting #1 and #3 cylinders;
(1) Disconnect connector from mass air flow sensor.
(2) Loosen clamp which connects air intake duct to air intake chamber.
(3) Remove the two clips from air cleaner upper cover.
CAUTION: Before installing air cleaner upper cover, align hole(s) with protruding portions of air cleaner lower case, then secure upper cover.
(4) Disconnect blow-by hose from air intake duct.
(5) Remove air intake duct and air cleaner upper cover as a unit.
(6) Remove air cleaner element.
(7) Disconnect spark plug cords from spark plugs (#1 and #3 cylinders).
(8) Remove under cover (RH).
(9) Place suitable container under the vehicle.
(10) Disconnect PCV hose from rocker cover (RH).
(11) Remove bolts, then remove rocker cover (RH).
- When inspecting #2 and #4 cylinders;
(1) Disconnect battery cables, and then remove battery and battery carrier.
(2) Disconnect washer motor connectors.
(3) Disconnect rear window glass washer hose from washer motor, then plug connection with a suitable cap.
(4) Remove the two bolts which holds washer tank, then secure the tank away from working area.
(5) Disconnect spark plug cords from spark plugs (#2 and #4 cylinders).
(6) Remove under cover (LH).
(7) Place suitable container under the vehicle.
(8) Disconnect PCV hose from rocker cover (LH).
(9) Remove bolts, then remove rocker cover (LH).
5) Set #1 cylinder piston to top dead center of compression stroke by rotating crankshaft pulley clockwise.
NOTE: When arrow mark on camshaft sprocket (RH) comes exactly to the top, #1 cylinder piston is brought to the top dead center of compression stroke.
6) Measure #1 cylinder valve clearance by using thickness gauge.
CAUTION:
- Insert the thickness gauge in as horizontal a direction as possible with respect to the valve stem end face.
- Measure exhaust valve clearances while lifting-up the vehicle.
Valve clearance:
Intake: 0.20±0.02 mm (0.0079±0.0008 in)
Exhaust: 0.25±0.02 mm (0.0098±0.0008 in)
7) If necessary, adjust the valve clearance.
8) Similar to measurement procedures used for #1 cylinder, measure #2, #3 and #4 cylinder valve clearances.
NOTE:
- Be sure to set cylinder pistons to their respective top dead centers on compression stroke before measuring valve clearances.
- To set #3, #2 and #4 cylinder pistons to their top dead centers on compression stroke, turn crankshaft pulley clockwise 90° at a time starting with arrow mark on right- hand camshaft sprocket facing up.
9) After inspection, install the related parts in the reverse order of removal.
B: ADJUSTMENT
CAUTION: Adjustment of valve clearance should be performed while engine is cold.
1) Set #1 cylinder piston to top dead center of compression stroke by rotating crankshaft pulley clockwise.
NOTE: When arrow mark on camshaft sprocket (RH) comes exactly to the top, #1 cylinder piston is brought to the top dead center of compression stroke.
2) Adjust the #1 cylinder valve clearance.
(1) Loosen the valve rocker nut and screw.
(2) Place suitable thickness gauge.
(3) While noting valve clearance, tighten valve rocker adjust screw.
(4) When specified valve clearance is obtained, tighten valve rocker nut.
Tightening torque: 10±1 N.m (1.0±0.1 kg-m, 7.2±0.7 ft-lb)
CAUTION:
- Insert the thickness gauge in as horizontal a direction as possible with respect to the valve stem end face.
- Adjust exhaust valve clearances while lifting-up the vehicle.
Valve clearance:
Intake: 0.20±0.02 mm (0.0079±0.0008 in)
Exhaust: 0.25±0.02 mm (0.0098±0.0008 in)
3) Ensure that valve clearances are within specifications.
4) Turn crankshaft two complete rotations until #1 cylinder piston is again set to top dead center on compression stroke.
5) Ensure that valve clearances are within specifications.
If necessary, re-adjust valve clearances.