Majestic L6-4.0L (1990)
Alignment: Technical Service Bulletins
Front Suspension - Calculating Pull Index
ALL except XJ6 Series III
Front Suspension - Vehicle Pulls to One Side - Check Pull Index
Remove and destroy Bulletin 60-6, Date 10/95.
Replace with this Bulletin.
Revisions are marked with a bar and indicated by asterisks.
Sedan Range (from 1988 MY) or XJS Range pulls to one side although alignment values are within specification as listed in Service Bulletin 60-5.
This condition can result from a combination of in-specification alignment value tolerances affecting the vehicle Pull Index. The vehicle Pull Index is a
numerical indication of the differences between the left and right camber values (camber balance) combined with the differences between left and right
caster values (caster balance).
If a Sedan Range (from VIN 506664) or XJS Range vehicle pulls to one side, check that the vehicle alignment and the Pull Index are within specification
for the vehicle model.
CALCULATING PULL INDEX
If the vehicle is properly aligned within specification and still pulls to one side, calculate the Pull Index based on the vehicle's current alignment
The calculated Pull Index will indicate the vehicle's tendency to pull to one side. Values more positive than the desired Pull Index indicate a tendency
to pull to the right, while values more negative than the desired Pull Index indicate a tendency to pull toward the left.
+5 = pull toward right
0 = neutral
-5 = pull toward left
Sedan Range Pull Index limit:
XJS Range Pull Index limit:
Calculate the Pull Index as follows:
(Camber imbalance - Caster imbalance) x 10 = Pull Index
Right side Camber - Left side Camber = Camber imbalance
Right side Caster - Left side caster = Caster imbalance
A calculator will perform the subtraction and multiplication of positive and negative values easily.
EXAMPLE 1 - CAMBER IMBALANCE
Subtract the Left Side Camber from the Right Side Camber to give the Camber Imbalance.
Right Side Camber - Left Side Camber Camber Imbalance
Right side camber value -0.9°
Left side camber value -0.6°
-0.9° - (-0.6°) = -0.3°
Always subtract the Left Side Camber value from the Right Side Camber value.