Valve Body: Service and Repair
VALVE BLOCKOverhaul
CAUTION: Ensure that all working surfaces are clean. Use only lint-free cloth and clean transmission fluid for lubricating.
Fig. 39:
Dismantling
68. Withdraw the manual valve (Fig. 39)
69. Remove the screws securing the suction tube assembly to the lower valve body (Fig. 39).
70. Lift off the tube assembly; remove and discard the gasket (Fig. 39).
71. Remove the six upper valve body securing screws from the lower valve body (Fig. 39).
72. Invert the valve body and remove the four screws securing the upper valve body and cam (Fig. 39) mounting arm, remove the mounting arm (Fig 39).
73. Extract the down-shift valve and spring (Fig 39).
74. Lift off the upper valve body (Fig. 39).
75. Remove the screws securing both end plates to the upper valve body. carefully remove the end plates (Fig 39).
76. Extract the spring, 12 shift valve and plunger (Fig 39).
77. Extract the 2-3 shift valve, spring and plunger (Fig 39).
78. Remove the eight screws securing the collector plate to the lower valve body; lift off the collector plate (Fig. 39).
79. Slacken, but do not remove the four screws securing the governor line plate (Fig. 39).
80. Hold the separator plate in contact with the valve body, remove the governor line plate securing screws and lift off the governor line plate (Fig 39).
81. Note the fitted position of the ball valve and carefully slide the separator plate off the valve body (Fig. 39).
CAUTION: The ball valve is spring loaded; ensure that the ball is not displaced during this operation.
82. Remove the ball valve; extract the spring (Fig. 39).
83. Note the fitted position of the check valve (if fitted), remove the valve (Fig. 39).
84. Withdraw the retainer. extract the spring and servo orifice control valve (Fig. 39).
85. Withdraw the retaining pin. extract the plug, modulator valve and spring (Fig. 39).
86. Withdraw the throttle valve spring retainer (Fig. 39).
87. Withdraw the throttle valve retainer (Fig. 39).
88. Extract the spring and throttle valve (Fig. 39).
89. Remove the screw securing the detent spring and roller assembly. detach the assembly; collect the spacer (Fig. 39).
NOTE: The roller arm may be peened to valve body. If so. swing the arm clear of the screws securing the regulator valve retaining plate
90. Remove the screws securing the regulator valve retaining plate; remove the plate slowly until the spring loading is no longer felt (Fig. 39).
91. Extract the spring. sleeve and primary regulator valve (Fig. 39).
92. Extract the spring and secondary regulator valve (Fig. 39).
Inspection
93. Check the springs with the data shown in spring identification table, renew springs which are distorted or shorter than the specified length.
94. Check all valves for burrs or scoring. Check that valves move freely in valve bodies.
CAUTION: In the event of valves and/or valve bodies being damaged, valve block assembly must be renewed.
Reassembling
Reverse instructions 68 to 92. ensure that all components are scrupulously clean and that tightening torque figures are adhered to.
CAUTION: A new gasket must be used when refitting the Suction tube assembly.