AutoZone 1987 Oldsmobile 98 3.8L FI OHV 6cyl | Repair Guides | Drive Train | Clutch | Slave (secondary) Cylinder | AutoZone.com

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    1987 Oldsmobile 98 3.8L FI OHV 6cyl

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    GM S-Series Pick-ups and SUV's 1994-1999 Repair Guide

    Slave (Secondary) Cylinder

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    On 1994-95 vehicles the slave cylinder is a conventional hydraulic actuator. It is located on the left side of the bell housing and controls the clutch release fork operation.

    On 1996-99 vehicles the slave cylinder is called a concentric slave cylinder. It is located on the inside of the transmission bell housing on the input shaft. Removal of the transmission is required to replace it. It directly engages the clutch release bearing.

    REMOVAL & INSTALLATION



    1994 Utility Models
    1. Disconnect the master cylinder pushrod from the clutch pedal assembly.
    2.  

    The master cylinder pushrod should be disconnected to protect the slave cylinder while it is removed from the bell housing. If not, any attempt to depress the clutch pedal while the slave cylinder is withdrawn from the bell housing will cause permanent damage to the slave cylinder assembly.

    1. Unfasten the slave cylinder-to-clutch housing nuts and separate the cylinder from the clutch housing.
    2.  
    3. Using a suitable hydraulic clutch line separator tool such as J-36221 or its equivalent, disconnect the slave cylinder hydraulic line coupling. Immediately cap or plug all openings to prevent system contamination or excessive fluid loss.
    4.  
    5. Disconnect the slave cylinder hydraulic line from the retaining clips.
    6.  

    To install:
    1. Uncover the hydraulic line openings.
    2.  
    3. Pre-fill and bleed the slave cylinder. Attach the slave cylinder to the clutch housing and make sure the slave cylinder push rod is seated in the clutch fork.
    4.  
    5. Connect the slave cylinder hydraulic line coupling and attach the line retaining clips.
    6.  
    7. Install the slave cylinder-to-clutch housing nuts and tighten to 18 ft. lbs. (24 Nm).
    8.  
    9. Attach the master cylinder push rod to the clutch pedal.
    10.  

    1994-95 Pick-up and 1995 Utility Models

    See Figures 1 and 2



    Click image to see an enlarged view

    Fig. Fig. 1: Slave cylinder mounting-1994-95 vehicles equipped with the Borg-Warner transmission



    Click image to see an enlarged view

    Fig. Fig. 2: Slave cylinder mounting-1994-95 vehicles equipped with the New Venture Gear transmission

    On the 2.2L engine, individual components of the clutch actuating system (master cylinder/slave cylinder) may not be available for service. If so it is recommended that a complete, pre-filled and pre-bled unit should be installed and NO attempts should be made to disconnect the hydraulic lines.

    1. Disconnect the master cylinder pushrod from the clutch pedal assembly.
    2.  

    The master cylinder pushrod should be disconnected to protect the slave cylinder while it is removed from the bell housing. If not, any attempt to depress the clutch pedal while the slave cylinder is withdrawn from the bell housing will cause permanent damage to the slave cylinder assembly.

    1. Using a 7 / 64 in. (3mm) punch to drive out the roll pin, disconnect the hydraulic line from the slave cylinder assembly. Immediately cap or plug all openings to prevent system contamination or excessive fluid loss.
    2.  

    To expedite the hydraulic clutch bleeding process, loose as little fluid as possible.

    1. Remove the slave cylinder-to-bell housing retaining nuts.
    2.  
    3. Remove the slave cylinder from the bell housing and from the vehicle.
    4.  

    To install:
    1. Install the slave cylinder to the bell housing, then tighten the retaining nuts to 18 ft. lbs. (24 Nm).
    2.  
    3. Uncover the hydraulic line openings, then connect the hydraulic line to the slave cylinder using a new O-ring (lightly lubricated with fluid) and a new roll pin.
    4.  
    5. Connect the master cylinder pushrod to the clutch pedal assembly.
    6.  
    7. Properly bleed the hydraulic system, then check for leaks.
    8.  

    1996-99 Models

    See Figures 3, 4, 5 and 6



    Click image to see an enlarged view

    Fig. Fig. 3: Concentric slave cylinder mounting-1996-99 vehicles equipped with the New Venture Gear transmission

    1. Remove the transmission.
    2.  
    3. Remove the 2 bolts securing the concentric slave cylinder to the transmission and input shaft.
    4.  
    5. Remove the concentric slave cylinder from the input shaft.
    6.  



    Click image to see an enlarged view

    Fig. Fig. 4: The concentric slave cylinder is retained by two bolts



    Click image to see an enlarged view

    Fig. Fig. 5: Unfasten the concentric slave cylinder bolts ...



    Click image to see an enlarged view

    Fig. Fig. 6: ... and remove the slave cylinder from the transmission by sliding it off the shaft

    To install:
    1. Install the concentric slave cylinder over the transmission input shaft making sure the bleed screw and coupling are properly positioned and install 2 bolts.
    2.  
    3. Tighten the bolts to 80 inch lbs. (9 Nm).
    4.  
    5. Install the transmission.
    6.  
    7. Bleed the clutch hydraulic system.
    8.  

    HYDRAULIC SYSTEM BLEEDING



    See Figures 7 and 8



    Click image to see an enlarged view

    Fig. Fig. 7: Location of the hydraulic clutch bleed screw



    Click image to see an enlarged view

    Fig. Fig. 8: Have an assistant fully depress and hold the clutch pedal, then open the bleeder screw of the slave cylinder or concentric cylinder using a box-end wrench

    Bleeding air from the hydraulic clutch system is necessary whenever any part of the system has been disconnected or the fluid level (in the reservoir) has been allowed to fall so low, that air has been drawn into the master cylinder.

    1. Fill master cylinder reservoir with new brake fluid conforming to DOT 3 specifications. Check manufactures recommendations for each vehicle.
    2.  


    CAUTION
    Never, under any circumstances, use fluid which has been bled from a system to fill the reservoir as it may be aerated, have too much moisture content and possibly be contaminated.

    1. Raise and safely support the vehicle high enough to work comfortable under it.
    2.  
    3. Have an assistant fully depress and hold the clutch pedal, then open the bleeder screw of the slave cylinder or concentric cylinder.
    4.  
    5. Close the bleeder screw and have your assistant release the clutch pedal.
    6.  
    7. Repeat the procedure until all of the air is evacuated from the system. Check and refill master cylinder reservoir as required to prevent air from being drawn through the master cylinder.
    8.  

    Never release a depressed clutch pedal with the bleeder screw open or air will be drawn into the system.

    1. Lower the vehicle and test clutch operation.
    2.  
    3. If the previous steps do not result in satisfactory pedal feel, remove the reservoir cap and pump the clutch pedal very fast for 30 seconds. Stop to let the air escape, then repeat the procedure as necessary to purge all remaining air.
    4.  
    5. Check the master cylinder fluid level and replenish as necessary.
    6.  

     
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