Series 3 Trimatic Transmission

SUBJECT:   VALVE BODY DISASSEMBLY / REASSEMBLY PROCEDURE.

MODELS:   HOLDEN HX, WITH TRIMATIC TRANSMISSION

SERVICE OPERATIONS-SERIES 3 TRIMATIC TRANSMISSION

Pending the publication of Volume 2 of the Series 3 Trimatic Service Manual - Service Operations, the following information will assist servicemen should it be necessary to disassemble a Series 3 type valve body. Valve body removal and installation is as outlined in the current Trimatic Service Manual P/N M37209, except the transfer plate is no longer attached to the valve body by two bolts.

Valve Body Disassembly:

  1. Remove the manual valve link and remove the manual valve from the valve body.
  2. Remove the transfer plate gasket if adhered to valve body.
  3. Using a pin punch with a straight shaft 3.175 mm (.125 in.) diameter, remove the retaining pin from the 1-2 shift train bore.
  4. Remove the 1-2 shift control valve sleeve, shift valve spring (if fitted) and shift valve. Remove the 1-2 shift control valve from the sleeve. Remove the1-2 control valve, spring and spring seat from the sleeve.
  5. Remove the 2-3 shift train retaining pin, then remove the 2-3 shift control valve sleeve, shift valve spring and seat (if fitted) and shift valve. Remove the 2-3 shift control valve, 2-3 control valve, spring and seat from the sleeve.
  6. Remove the 3-2 control valve retaining pin, bore plug, spring and valve.
  7. Remove the detent pressure regulator valve retaining pin, spring and valve.
  8. Remove the 1-2 accumulator valve retaining pin, bore plug, 1-2 accumulator valve and spring (if fitted). Remove the 1-2 accumulator control valve.
  9. Remove the manual low and reverse control valves retaining pin, spring, manual low valve and reverse control valve.
  10. Remove the high speed downshift timing valve retaining pin, spring and valve. Remove the retaining pin from the low speed timing control valve sleeve (Fig. 1) and remove the sleeve.

    NOTE: Do not lose the low speed timing control valve as the sleeve is removed. Remove the low speed timing valve and spring.
  11. If necessary, remove the accumulator piston as follows:
    1. Support the valve body around the accumulator piston bore on the bed of a press using a 50.8 mm (2 in.) I.D, thick wall tube, 50.8 mm (2 in) long. (Fig. 2 ).
    2. With a 6.35 mm (.25 in.) drift, press the accumulator piston pin from the valve body. Remove piston and spring.

    Low Speed timing Contril ValveAccumulator Piston Pin

Cleaning:   
Important: A clean work area which is free of dirt and dust should be used to inspect, clean and install the valves in the valve body.

Handle valve components with clean hands and tools. Since most valve failures are caused initially by dirt or other foreign matter preventing a valve from functioning properly, a thorough cleaning of all the components with a cleaning solvent is essential. Use clean dry, compressed air to blow dry all components and passages. Clean oil strainer with cleaning solvent and blow off with compressed air.

Inspection:   Revisions have been made to the oil passages in the valve body of Series 3 Transmissions to provide boosted line pressure in 'S' intermediate range. Valve bodies incorporating the revised passages can be identified by the letter 'E' cast in the line pressure port at the manual valve.

Valve body application can be identified by the last three digits of the production (not service) part number stamped on the underside of the body on the ground surface adjacent to the accumulator piston pin. This area also carries a letter to indicate the calibration of the valve body.

Inspect each valve for free movement in its respective bore in the valve body. If necessary, use 600 grade wet and dry cloth, liberally oiled with transmission fluid to remove small burrs on a valve. Do not remove the sharp edges of the valves as these perform a cleaning action within the bore. Inspect the valve springs for distortion or collapsed coils.

Transfer Plate Part NUmber Location
Inspect the transfer plate for dents or distortion. If damaged replace transfer plate. Do not try to repair. Transfer plates are identified by their part number stamped in the area shown in Fig. 3. All Series 3 Trimatic Codes use the same type transfer plate to case gasket and transfer plate to valve body gasket.

Inspect accumulator piston, and seal ring check for proper sealing in piston bore damage. Replace any defective parts.

Valve Body Reassembly:   Reassembly procedures are generally the reverse to disassembly, however, the following points should be noted.

Lubricate all parts with Dexron Automatic Transmission fluid. Refer to Fig. 4 for identification and location of parts.

Valve Body Identification VALVE BODY IDENTIFICATION (FIG. 4)   

  1. Retaining pin
  2. 1-2 Shift control valve sleeve
  3. 1-2 Control valve spring
  4. 1-2 Control valve spring seat
  5. 1-2 Control valve
  6. 1-2 Shift control valve
  7. 1-2 Shift valve spring (not used Codes KJ, KK; KX, KH)
  8. 1-2 Shift valve
  9. Retaining pin
  10. 2-3 Shift control valve sleeve
  11. 2-3 Control valve spring
  12. 2-3 Control valve spring seat
  13. 2-3 Control valve
  14. 2-3 Shift control valve
  15. 2-3 Shift valve spring (not used Codes KJ, KK, KX, KH)
    1. 2-3 Shift valve spring seat (°not used Codes KJ, KK, KX, KH)
  16. 2-3 Shift valve
  17. Retaining pin
  18. 3-2 Control valve bore plug
  19. 3-2 Control valve spring
  20. 3-2 Control valve
  21. Retaining pin
  22. Detent pressure regulator valve spring
  23. Detent pressure regulator valve
  24. Manual valve
  25. 1-2 accumulator control valve
  26. 1-2 Accumulator valve spring (not used code KJ)
  27. 1-2 Accumulator valve
  28. 1-2 Accumulator valve bore plug
  29. Retaining pin
  30. Reverse control valve
  31. Manual low control valve
  32. Reverse and low control valves spring
  33. Retaining pin
  34. Low speed timing valve spring
  35. Low speed timing valve
  36. Low speed timing control valve
  37. Retaining Pin
  38. Low speed timing control valve sleeve
  39. High speed downshift timing valve
  40. High speed downshift valve spring
  41. Retaining pin
  42. Accumulator piston pin
  43. Accumulator piston
  44. Accumulator piston spring

Valve 1-2 and 2-3 Shift Train Installation:   

  1. Install 1-2 shift valve into appropriate bore in valve body, followed by the 1-2 shift valve spring (if fitted).
  2. Install the 1-2 control valve spring and seat into the 1-2 shift control valve sleeve. The seat must be placed toward the larger I.D. end of the sleeve. Refer Fig. 5.
  3. Install the 1-2 control valve into sleeve, long stem first.

    NOTE: It may be necessary to align the seat and spring in the sleeve to permit the control valve to be installed.
  4. Install the 1-2 shift control valve into the sleeve.
  5. Install the sleeve and valves as an assembly into the valve body and install retaining pin.

    NOTE: Solid grooved retaining pins are used at the eight valve train retaining locations. The pins have either three or four grooves to provide an interference fit over the last 0.12 inch of the pin to prevent burrs being formed in the valve bores as the pins are being installed.

    It is important to note that the pins must be installed from the underside (the unmachined side) of the valve body.

    If the pins are drive in from the transfer plate (machined) side, the grooves on the pins will cause slight bulging of the machined surface of the valve body and cause oil leaks between the body and transfer plate gasket.
  6. Install the 2-3 shift valve into its bore in the valve body followed by the 2-3 shift valve spring seat and spring (if fitted).
  7. Install the 2-3 control valve spring and seat into the 2-3 shift control valve sleeve, refer Fig. 5.
  8. Install the 2-3 control valve into the sleeve, long stem first. It may be necessary to align the spring and seat to achieve this. Then install the 2-3 shift control valve into the sleeve.
  9. Install the sleeve and valves as an assembly into the valve body and install the retaining pin.

Control Valve, Spring and Seat Installation

High and Low Speed Timing Valve Installation:   

  1. Install the low speed timing valve spring and valve into the valve body.
  2. Install the low speed timing control valve into its sleeve and install the sleeve into the valve body.
  3. Install the high speed downshift timing valve, spring and retaining pin.

High and Low Speed Timing Valve Installation:   

  1. Install the accumulator piston spring in bore of valve body. Fit seal ring to piston, lubricate piston pin with Dexron automatic transmission fluid and install pin through piston.
  2. Locate the pin in the valve bod¥ and using a suitable drift, press pin in until it is flush - .010 with the lower face of the valve body.

    NOTE: Force piston down by hand so that seal ring is below the chamfer at the top of the bore to avoid jamming the piston as the pin is pressed home.