Rotary Valve: Inspection

If it is evident that torsion bar "O" ring seal in stub shaft has been leaking, the entire assembly should be replaced. Check pin valve body that engages the cap. If it is severely worn, cracked, or broken, then entire valve assembly should be replaced. Check smaller of the two worm pin grooves in valve body. If it is severely worn, replace entire valve assembly. Check spool drive pin on stub shaft. If it is severely worn, cracked, or broken, replace entire valve assembly. Check spool outer diameter and valve body inner diameter for nicks, burrs, or bad wear spots. If any are found, replace entire valve assembly.

Check fit of spool in valve body before installing valve spool dampener "O" ring seal. When lubricated with transmission oil, the spool should rotate smoothly without binding or catching. If either occurs, the entire valve assembly should be replaced. Examine needle bearing diameter of stub shaft. If it is badly worn, brinelled, or scored, replace entire valve assembly. Measure free length and inner diameter of top loop of valve spool spring. If not within specifications listed in table below, replace spring.