XJ-6 L6-3.6L (1989)
Technical Service Bulletin # 649901001
Date: 901001
Ride Height Sensor - New Modification Procedure
REVISED RIDE LEVEL SENSOR
SECTION:
64
No:
9
Model:
88-90 MY SEDAN RANGE Date: OCTOBER, 1 990
KEY POINTS:
MODIFICATION PROCEDURE
Beginning with VIN 617978, a new ride height sensor has been introduced to prevent ride level strut knock due to a decrease of trapped line pressure.
The new sensor incorporates a charge replenishment cycle each time the ignition is switched on.
The new sensor (DBC 6768) can be installed on all Sedans from 1988 MY using the following procedure:
CAUTION:
Before installing the new sensor on 1988/1989 MY Sedans:
^
The power hydraulic high pressure hose (CCC 2637) MUST be installed as part of recall campaign D348. The part number is stamped on the
aluminum band wrapped around the hose.
^
The pressure relief valve in the solenoid valve block must be replaced with a revised valve (CCC 3832) using Service Tool JD 176.
On 1990 MY Sedans:
^
The high pressure hydraulic hose must be part number CCC 2625. The part number is stamped on the aluminum band wrapped around the hose.
This hose was introduced at VIN 614000.
Installation Procedure:
^
Raise the rear of the vehicle and support on stands.
^
Remove the R/H rear wheel and tire assembly to gain access to the ride height sensor. Disconnect the sensor link rod from the suspension
mounting position.
^
Move the sensor from the mounting bracket and disconnect the block connector.
^
Remove the clip securing the link arm to the sensor. Note the position of the link arm to the sensor and remove the link arm mounting bolt.
Remove the link arm/rod assembly.
^
Install the link arm assembly to the new sensor (DBC 6768). Install the clip. Move the link arm to the noted position and secure with the bolt.
^
Install the block connector to the ride height sensor. Install the sensor to the mounting bracket. Reconnect the link arm to the suspension mounting
position.
^
Install wheels and tires. Lower the vehicle.
^
Open the hood and check the high pressure hose part number specification as per the "Caution" on page 1. Ensure that the correct hose is installed.
Use the following procedure on all 1988/1989 MY vehicles:
^
Remove the bolt securing the high pressure feed hose to the valve block mounting bracket. Reposition the high pressure hose and A/C hose
assembly. Secure using string to gain access to the valve block assembly.
^
Using a cleaning fluid, clean the relief valve face and area around the valve block.
CAUTION: Absolute cleanliness is required during the removal and replacement of the pressure relief valve assembly.
^
Place a clean shop cloth under the valve block assembly.
^
Position an open ended wrench across the valve block (position the jaws over the "cast on" "Girling" insignia).
^
With the aid of an assistant holding the open ended wrench, use tool JD 176 and remove the pressure relief valve from the valve block.
