Valve Body Assembly: Inspection

Remove gasket from lower valve body. Note check ball, pin, spring and retainer location. Hold plate to lower valve body to ensure check balls do not fall out. Remove plate and gasket and note check ball, pin and retainer locations on upper valve bodies. Clean all parts in solvent. Dry with compressed air. Ensure all valve body passages are clear.
Inspect valves for scoring or roughness. Ensure valves slide freely in bores. Inspect valve springs for damage, squareness and collapsed coils. Measure spring free length and outer diameter. Replace spring if not within specification. See VALVE BODY SPRING SPECIFICATIONS .

Fig 1: Exploded View Of Lower Valve Body

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Fig 2: Identifying Lower Valve Body Check Ball Pin, Spring & Retainer Locations

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Fig 3: Exploded View Of Front Upper Valve Body

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Fig 4: Exploded View Of Rear Upper Valve Body

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Fig 5: Identifying Rear Upper Valve Body Check Ball Pin & Retainer Locations

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.