FRONT PROPELLER SHAFT
There are two front propeller shafts used on ZJ
vehicles. Both shafts use a double cardan joint at the
transfer case end. The difference between the two
shafts is how they connect to the front axle and how
they handle the variation in length required by sus-
pension travel. The one shaft has a Constant Velocity
(CV) joint at the axle end of the propeller shaft which
contracts and extends as necessary. The CV joint has
a splined shaft which allows the overall shaft length
to be adjusted for optimum joint travel. This spline
shaft is then locked in place with a nut. The second
shaft uses a single Cardan universal joint at the axle
and a slip yoke to handle length changes.
PROPELLER SHAFT JOINTS
Three different types of propeller shaft joints are
used in ZJ vehicles (Fig. 2), (Fig. 3), and (Fig. 4).
None of the three joints are servicible. If worn or
damaged, they must be replaced. If a vehicle has a
damaged or worn Constant Velocity (CV) joint, or
boot, the propeller shaft must be replaced.
PROPELLER SHAFT JOINT ANGLE
When two shafts come together at a common joint,
the bend that is formed is called the operating angle.
The larger the angle, the larger the amount of accel-
eration and deceleration of the joint. This speeding
up and slowing down of the joint must be cancelled
to produce a smooth power flow. This is done through
the phasing of a propeller shaft and ensuring that
the proper propeller shaft joint working angles are
maintained.
A propeller shaft is properly phased when the yoke
ends are in the same plane, or in line. A twisted
shaft will make the yokes out of phase and cause a
noticeable vibration.
When taking propeller shaft joint angle measure-
ments, or checking the phasing, of two piece shafts,
consider each shaft separately.
Ideally the driveline system should have;
•
Angles that are equal or opposite within 1
degree of each other.
•
Have a 3 degree maximum operating angle.
•
Have at least a 1/2 degree continuous operating
(propeller shaft) angle.
Engine speed (rpm) is the main factor in determin-
ing the maximum allowable operating angle. As a
guide to the maximum normal operating angles refer
to (Fig. 5).
Fig. 1 Front & Rear Propeller Shafts
TRANSFER CASE
REAR AXLE
STRAP
Fig. 2 Single Cardan U-Joint
CROSS
SEAL
CAP AND
NEEDLE
BEAR-
INGS
3 - 2
DIFFERENTIAL AND DRIVELINE
ZG
GENERAL INFORMATION (Continued)
Summary of Contents for 1997 Grand Cherokee
Page 6: ...FASTENER IDENTIFICATION 4 INTRODUCTION ZG GENERAL INFORMATION Continued ...
Page 9: ...METRIC CONVERSION ZG INTRODUCTION 7 GENERAL INFORMATION Continued ...
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Page 1684: ...TORQUE 9 86 5 2L ENGINE ZG SPECIFICATIONS Continued ...
Page 1689: ...Fig 3 Oil Lubrication System ZG 5 9L ENGINE 9 91 DESCRIPTION AND OPERATION Continued ...
Page 1723: ...DIAGNOSIS AND TESTING SERVICE DIAGNOSIS DIESEL PERFORMANCE ZG ENGINE 9 3 ...
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