Valve Clearance: Adjustments

ADJUSTING SHIM SELECTION CHARTS:
Intake





Exhaust





INSPECTION AND ADJUSTMENT OF VALVE CLEARANCE

HINT: Inspect and adjust the valve clearance when the engine is cold.

1. REMOVE PLUG CORD COVER
2. DISCONNECT HIGH-TENSION CORDS FROM SPARK PLUGS
3. REMOVE CYLINDER HEAD COVERS
4. SET NO.1 CYLINDER TO TDC/COMPRESSION




(a) Turn the crankshaft pulley and align its groove with the timing mark "0" of the No.1 timing belt cover.
(b) Check that the valve lifters on the No.1 cylinder are loose and valve lifters on the No.4 cylinder are tight.
If not, turn the crankshaft one revolution (360°0) and align the mark as above.

5. INSPECT VALVE CLEARANCE




(a) Check only the valves indicated as shown.
^ Using a feeler gauge, measure the clearance between the valve lifter and camshaft.
^ Record the valve clearance measurements which are out of specification. 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 in.)
Exhaust: 0.20 - 0.30 mm (0.008 - 0.012 in.)

(b) Turn the crankshaft one revolution (360°0) and align the mark as above.





(c) Check only the valves indicated as shown. Measure the valve clearance.
(d) Remove the adjusting shim.
^ Turn the crankshaft to position the cam lobe of the camshaft on the adjusting valve upward.





^ Using SST (A), press down the valve lifter and place SST (B), between the camshaft and valve lifter. Remove SST (A).
SST 09248-55010

HINT: Before pressing down the valve lifter, position the notch toward the spark plug.





^ Remove the adjusting shim with a small screwdriver and magnetic finger.
(e) Determine the replacement adjusting shim size by using the following Formula or Charts:




- Using a micrometer, measure the thickness of the shim which was removed.
- Calculate the thickness of the new shim so the valve clearance comes within specified value.

T = Thickness of used shim
A = Measured valve clearance
N = Thickness of new shim

Intake side: N = T + (A - 0.20 mm (0.008 in.))
Exhaust side: N = T + (A - 0.25 mm (0.010 in.))

^ Select a new shim with a thickness as close as possible to the calculated values.

HINT: Shims are available in seventeen sizes in increments of 0.050 mm (0.0020 in.), from 2.500 mm (0.0984 in.) to 3.300 mm (0.1299 in.).

(f) Install a new adjusting shim.
^ Place a new adjusting shim on the valve lifter.





^ Using SST (A), press down the valve lifter and remove SST (B).
SST 09248-55010

(g) Recheck the valve clearance.

6. RE-INSTALL CYLINDER HEAD COVERS
7. CONNECT HIGH-TENSION CORDS TO SPARK PLUGS
8. REINSTALL PLUG CORD COVER
9. INSPECT AND ADJUST IGNITION TIMING
Ignition timing: 10° BTDC @ idle (w/ Terminals TE1 and E1 connected)

10. INSPECT AND ADJUST IDLE SPEED
Idle speed (w/ Cooling fan OFF): 800 rpm

11. INSPECT AND ADJUST DASH POT (DP) SETTING SPEED
DP setting speed (w/ Cooling fan OFF): 1,800 rpm