Vanden Plas L6-4.0L (1990)
Suspension Strut / Shock Absorber: Customer Interest
Ride Level Struts - Stay at Maximum Height
66-22
AMENDED
9/94
Ride Leveling Struts Stay at Maximum Height and/ or Pressure Relief Valve Cycles - Charge Valve Blocked - Clean Hydraulic System/Install Filters
MODEL: Sedan Range 1988 - 1993 MY
DATE: 1/94
Remove and destroy Bulletin 66-22, Date 1/94.
Replace with this Bulletin.
Revisions are marked with a bar and indicated in Bold Text
ISSUE:
On 3.6 and 4.0 liter Sedan vehicles with ride leveling, the following conditions can occur:
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The rear struts rise to maximum height when the engine is started and remain fully extended until the engine is switched off.
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The power hydraulic pressure relief valve cycles continuously.
Either or both of these conditions can be caused by debris in the ride level system blocking the charge valve filter screen.
ACTION:
If either of the above conditions occur, confirm that the charge valve is the cause by disconnecting the solenoid valve electrical plug and starting the
engine.
If the condition does not occur after the solenoid valves are disconnected, an electrical problem exists and this bulletin does not apply. For further
diagnosis, refer to the Power Hydraulic System Focus Book (S 73).
If the condition still occurs after the solenoid valves are disconnected, disassemble the solenoid valve block and replace the charge valve. Thoroughly
clean the valve block and remaining valves(s) before reassembly. For valve block service information, refer to the Power Hydraulic System Focus Book.
At the same time, perform the following procedure to install rear strut filters and clean and power hydraulic system.
There are procedures for three vehicle groups:
1.
1988/89 MY 3.6L Sedans.
2.
1990 to 1992 MY 4.OL Sedans (with combined reservoir for ride leveling and power steering systems).
3.
1993 MY 4.OL Sedans (with separate reservoir for ride leveling system).
Procedures:
NOTE:
Use only approved Hydraulic System Mineral Oil when filling the power hydraulic/ride leveling reservoir.
1.
1988/89 MY 3.6L Sedans
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Install rear strut filters using the following procedure:
A. Remove both rear struts from the vehicle. Refer to XJ6 Service Manual section 66.20.01.
B. Perform the following work on each strut:
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Remove the coiled feed pipe and union nut from the top of the strut shaft
^
Remove the brass restrictor from the shaft.
