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Valve Clearance

  1. Adjust valves with engine at normal operating temperature. Remove accelerator linkage and cylinder head cover. Clearance adjustments are to be checked and made according to firing order sequence. Rotate crankshaft until cam lobes for No. 1 cylinder valves point upward. Measure valve clearances of No. 1 cylinder.
    NOTE: When adjusting valves, turn engine CLOCKWISE only to avoid timing belt slippage.
  2. If adjustment is necessary, use disc remover (US4476) and tappet depressor (2078) to remove and install adjusting discs. Turn tappet until notches are at 90° to camshaft. Insert depressor (2078) and depress tappet. Using disc remover (US4476), grasp tappet disc and rotate it out from under camshaft.
  3. Thickness is stamped on bottom side of disc. Use clearance measurement to choose adjusting disc. Discs are available in 0.002" (.05 mm) increments from 0.118 - 0.167" (3.0-4.3 mm). Repeat procedure as required for remaining valves.
VALVE CLEARANCE SPECIFICATIONS

Application Clearance In. (mm)
Intake .008-.012 (.2-.3)
Exhaust .016-.020 (.4-.5)
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