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Check valve clearance while engine is warm but not running.

1. Remove rocker cover and all spark plugs
2. Set No. 1 cylinder at TDC on its compression stroke

• • Align pointer with TDC mark on crankshaft pulley.
  • Check that valve lifters on No 1 cylinder are loose and valve lifters on No 4 are tight. If not, turn crankshaft one revolution (360°) and align as above.

1. Check only those valves shown in the figure.

1. Turn crankshaft one revolution (360°) and align mark on crankshaft pulley with pointer.
2. Check those valves shown in the figure.

• • Use the same procedure as mentioned in step 4.

1. If all valve clearances are within specification, install the following parts.

• • Rocker cover
  • All spark plugs

ADJUSTING
Adjust valve clearance while engine is cold.

1. Turn crankshaft to position cam lobe on camshaft of valve that must be adjusted upward.
2. Place Tool (A) around camshaft as shown in figure

1. Place Tool (B) between camshaft and the edge of the valve lifter to retain valve lifter. CAUTION:

• • Tool (B) must be placed as close to camshaft bracket as possible.
  • Be careful not to damage cam surface with Tool (B).

1. Remove Tool (A).

1. Determine replacement adjusting shim size as follows.

• 1. Using a micrometer determine thickness of removed shim.
  2. Calculate thickness of new adjusting shim so valve clearance comes within specified values. R = Thickness of removed shim N = Thickness of new shim M = Measured valve clearance Intake & Exhaust: N = R + [M - 0.37 mm (0.0146 inch)]
  3. 
     Shims are available in thicknesses from 1.96 mm (0.0772 inch) to 2.68 mm (0.1055 in), in steps of 0.02 mm (0.0008 inch).
     
     
     1. Select new shim with thickness as close as possible to calculated value.
     nstall new shim using a suitable tool.
     • Install with the surface on which the thickness is stamped facing down.
  4. Place Tool (A) as mentioned in steps 2 and 3.
  5. Remove Tool (B).
  6. Remove Tool (A).
  7. Recheck valve clearance.