Ford Falcon. Manual — part 41
205-00-8
Driveline System — General Information
205-00-8
DIAGNOSIS AND TESTING (Continued)
Ideal Tooth Contact Pattern on Ring Gear
Acceptable Pattern
Faulty gear set.
The drive pattern shown was rolled on a hunting-type
Shim and Backlash Changes
gear set. Since each pinion tooth came into contact
with each ring gear tooth, the pattern is a result of the The patterns shown are typical of gear sets that have
combined tooth contacts. Therefore, the pattern is
either an incorrect backlash or an incorrect shim
uniform from tooth to tooth.
adjustment. Since each gear set rolls a characteristic
pattern, the patterns shown should be considered as
Acceptable Gear Tooth Contact Pattern
typical only and should be used as a guide rather than
a rigid standard. The drive pattern is rolled on the
convex side of the tooth, and the coast pattern is
rolled on the concave side.
Unacceptable Pattern
An erratic tooth pattern on a hunting gear set
indicates gear set runout and is caused by one of the
following conditions:
Foreign matter between differential hemisphere
gear locating base and back face of crown wheel.
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205-00-9
Driveline System — General Information
205-00-9
DIAGNOSIS AND TESTING (Continued)
Typical Gear Tooth Contact Patterns Indicating Shim or Backlash Change
2. Chock the front wheels.
Driveline Vibration
3. Raise the rear of the vehicle, remove one rear
For information regarding driveline, Refer to Section
wheel and attach the Special Tool No. E6662.
205-01.
4. Lower the rear of the vehicle to simulate normal
Limited Slip Differentials (M78 & M86)
ride height (ie. For IRS, lower arms should be
horizontal to the ground).
Cone Chatter
5. Place the transmission in neutral and release the
When encountering complaints of limited slip cone
park brake.
chatter, the vehicle should be warmed up for 10
6. Ensure that there is no brake drag affecting wheel
minutes and then driven in tight circles (slightly less
rotation.
than full steering lock), five times clockwise and five
7. Attach a torque meter to the special tool, and
times anti-clockwise at approximately 10 km/h to allow
rotate the axle.
lubricant to work in between the cone friction
surfaces.
The torque required to rotate the axle shaft for a used
M78 L.S.D. unit should be between 50 and 130 Nm.
If the chatter persists, drain the lubricant, refill the axle
Reading should be steady within 10 Nm.
with the specified lubricant and repeat the aforesaid
The torque required to rotate the axle shaft for a used
procedure. It may be necessary to drive the vehicle
M86 L.S.D. unit should be between 50 and 130 Nm.
10-20 km before re-evaluating to allow the new
Reading should be steady within 10 Nm.
lubricant to take affect. Should chatter still be evident,
dismantling of the differential for further inspection
and repair will be necessary. A whirring sound due to
over-running of the cones is no indication of LSD unit
failure.
In Vehicle Limited Slip Differential Torque Testing
To test the Limited Slip Differential (LSD) for correct
operation proceed as follows:
1. Drive vehicle 10 km to warm up axle oil.
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205-00-10
Driveline System — General Information
205-00-10
DIAGNOSIS AND TESTING (Continued)
Drive Pinion Flange
Check the flange mating face for damage and wear.
The end of the flange contacting the bearing cone and
the seal surface must be free from surface
imperfections like burrs and scoring.
Carrier Casting
Make sure that the differential bearing bores are
smooth and the differential bearing preload spacer
abutment faces are not damaged.
Differential Case
Carefully examine the case bearing hubs for damage.
The bearing assemblies will fail if they do not seat
against the shoulder on the hubs correctly.
If the torque required to continuously rotate the wheel
is outside the specification check the differential for
Limited Slip Differential (LSD)
improper assembly and/or rework.
For M78 LSDs, thoroughly clean and dry all parts and
Inspection after Removal & Dismantling
check the following:
Thoroughly clean all parts. Always use new solvent
The cone seats in the case should be smooth and
when cleaning bearings. Oil the bearings immediately
free from excessive scoring. Slight grooves or
after cleaning to prevent rusting. Inspect the parts for
scratches are permissible and normal.
any major defects. Clean the inside of the case,
The land surfaces of the cones will duplicate the
particularly the oil ports, before rebuilding and
case surface condition. Excessive wear or
installing. Inspect individual parts as outlined below.
damaged cone surfaces will necessitate renewal
of the cone and casing.
Hypoid and Differential Gears
Inspect thrust springs for damage. Replace where
The pattern taken during dismantling should help in
necessary.
judging if the gears can be re-used. Worn gears
Check the thrust blocks for excessive wear.
cannot be rebuilt to correct a noisy condition. Gear
Replace where necessary.
scoring is the result of excessive shock loading or the
use of an incorrect lubricant. Scored gears must be
For M86 LSDs, thoroughly clean and dry all parts and
replaced. Examine the teeth and thrust surface of the
check the following:
differential gears.
The LSD plates and disc must be in good
condition. If any one member of either stack
NOTE: Check the fit of the side gear hubs in the case
shows evidence of excessive wear or scoring, the
on M78 conventional differentials. Wear on the hub of
complete stack is to be replaced on both sides of
the side gear can cause a “chuckling” noise known as
the assembly.
“chuckle” when the vehicle is driven at low speeds.
Side and pinion gears should be checked for
Wear on splines, thrust surfaces, or thrust washers
extreme wear and possible cracks. The external
can contribute to excessive driveline backlash.
teeth of the side gear, which retain the concentric
groove discs, should also be checked for wear or
Bearings
cracks.
Check bearing cups for rings, scores, galling or erratic
If replacement of one gear is required due to
wear patterns. Pinion bearing cups must be solidly
wear, etc., then both side gears, pinion mate
seated. Check by attempting to insert a 0.05 mm
gears, and washers are to be replaced.
feeler between the cups and the bottom of their bores.
If excessive wear is evident on the cross pin, it
The cone and roller assemblies on the differential
should be replaced.
case and the rear cone and roller on the pinion should
If wear is evident on any one of the clutch retainer
be checked before being removed from the differential
clips, all four clips must be replaced.
case or pinion. When these cones and rollers have
been removed the cones and rollers and their
If scoring, wear or metal pick-up is evident on the
respective bearing cups should be discarded. When
machined surfaces of the differential case, then
revolved in the cups, bearing rollers must turn without
replacement of the case is necessary.
roughness. Examine the roller ends for wear.
Stepwear on the roller ends indicates the bearing
preload was incorrect or the rollers were slightly
misaligned.
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205-01-1 Driveshaft 205-01-1
SECTION : 205-01 Driveshaft
VEHICLE APPLICATION : 2003.0 BA Falcon
CONTENTS
PAGE
SPECIFICATIONS
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .205-01-2
DESCRIPTION AND OPERATION
Driveshaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...205-01-3
Universal Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..205-01-3
DIAGNOSIS AND TESTING
Driveshaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...205-01-4
Inspection and Verification . . . . . . . . . . . . . . . . . . . . . . . . ...205-01-4
Symptom
Chart
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205-01-5
GENERAL PROCEDURES
Take — Off Shudder . . . . . . . . . . . . . . . . . . . . . . . . . . . ..205-01-6
REMOVAL AND INSTALLATION
Driveshaft Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . ..205-01-7
DISASSEMBLY AND ASSEMBLY
Flex Joint Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .205-01-8
Universal Joint Replacement . . . . . . . . . . . . . . . . . . . . . . . . .205-01-8
Centre Bearing Replacement . . . . . . . . . . . . . . . . . . . . . . . . .205-01-9
CV Joint Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .205-01-10
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