Lincoln Navigator Manuals

Lincoln Navigator: Front Drive Halfshafts / Front Drive Halfshafts. Diagnosis and Testing

Lincoln Navigator 2018-2025 Workshop Manual / Driveline / Front Drive Halfshafts / Front Drive Halfshafts. Diagnosis and Testing

Preliminary Inspection

  1. Visually inspect the CV joints, housing, boots, and clamps for obvious signs of mechanical damage.
  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step
  1. If the cause is not visually evident, verify the symptom and REFER to Symptom Chart: NVH.

Symptom Chart(s)

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

Symptom Chart: NVH

  Symptom Chart


Condition Actions
Axle howling or whine – front or rear axle   GO to Pinpoint Test A
Driveline clunk - loud clunk when shifting from REVERSE to DRIVE   GO to Pinpoint Test B
Driveline clunk (Front Wheel Drive (FWD) vehicles) — occurs during acceleration or from cruise to coast/deceleration   GO to Pinpoint Test C
Driveline clunk — occurs as the vehicle starts to move forward following a stop   GO to Pinpoint Test D
Clicking, popping or grinding - occurs while the vehicle is turning   GO to Pinpoint Test E
Grunting — normally associated with a shudder experienced during acceleration from a complete stop   GO to Pinpoint Test F
Driveline vibration - occurs at cruising speeds   GO to Pinpoint Test G

PINPOINT TEST A: AXLE HOWLING OR WHINE – FRONT OR REAR AXLE

Normal Operation and Fault Conditions

Halfshafts transmit rotary motion through constant velocity joints in a uniform manner. The outer CV joints use balls, have no length compensation and engage in the wheel hubs. The intermediate shaft (right side) is correctly positioned and secured in the differential by the intermediate shaft center bearing. The left CV joint is locked in the differential by a snap-ring.

Possible Sources

  • Damaged or worn wheel hub bearings
A1 INSPECT WHEEL HUB BEARINGS
  • Inspect wheel hub bearings

Was any wheel hub bearing play or damage found?
Yes Install a new wheel hub bearing.
REFER to: Front Wheel Bearing and Wheel Hub (204-01B Front Suspension - LHD 4WD, Removal and Installation).
No Inspect the vehicle for any other symptoms related to the halfshafts.

PINPOINT TEST B: DRIVELINE CLUNK- LOUD CLUNK WHEN SHIFTING FROM REVERSE TO DRIVE

Normal Operation and Fault Conditions

Halfshafts transmit rotary motion through constant velocity joints in a uniform manner. The outer CV joints use balls, have no length compensation and engage in the wheel hubs. The intermediate shaft (right side) is correctly positioned and secured in the differential by the intermediate shaft center bearing. The left CV joint is locked in the differential by a snap-ring.

Possible Sources

  • Damaged or worn Constant Velocity (CV) joints
  • Loose hub nut
B1 CHECK THE HUB NUT TORQUE
  • Check the hub nut torque

Is the hub nut loose?
Yes Tighten the hub nut to specification.
REFER to: Halfshaft (205-04 Front Drive Halfshafts, Removal and Installation).
No GO to B2

B2 CHECK THE CONSTANT VELOCITY (CV) BOOTS AND JOINTS FOR WEAR OR DAMAGE
  • Check the constant velocity (cv) boots and joints for wear or damage

Was damage found?
Yes Inspect the CV joints and halfshaft. Replace components as necessary.
REFER to: Halfshaft (205-04 Front Drive Halfshafts, Removal and Installation).
No GO to B3

B3 CHECK THE TORQUE ON SUSPENSION AND STEERING SYSTEM FASTENERS
  • Check the lower arm nut torque
  • Check the tie rod nut torque
  • Check the stabilizer bar link nut torque
  • Check the upper arm nut torque (If equipped)

Is the any of the suspension and steering fastener loose?
Yes Tighten the fastener to specification.
REFER to: Lower Arm (204-01B) .
REFER to: Front Stabilizer Bar (204-01A Front Suspension - LHD RWD, Removal and Installation).
REFER to: Upper Arm (204-01B) .
No Inspect the vehicle for any other symptoms related to the halfshafts.

PINPOINT TEST C: DRIVELINE CLUNK (FRONT WHEEL DRIVE (FWD) VEHICLES) — OCCURS DURING ACCELERATION OR FROM CRUISE TO COAST/DECELERATION

Normal Operation and Fault Conditions

Halfshafts transmit rotary motion through constant velocity joints in a uniform manner. The outer CV joints use balls, have no length compensation and engage in the wheel hubs. The intermediate shaft (right side) is correctly positioned and secured in the differential by the intermediate shaft center bearing. The left CV joint is locked in the differential by a snap-ring.

Possible Sources

  • Damaged or worn Constant Velocity (CV) joints
  • Loose hub nut
C1 CHECK THE HUB NUT TORQUE
  • Check the hub nut torque

Is the hub nut loose?
Yes Tighten the hub nut to specification.
REFER to: Halfshaft (205-04 Front Drive Halfshafts, Removal and Installation).
No GO to C2

C2 CHECK THE CONSTANT VELOCITY (CV) BOOTS AND JOINTS FOR WEAR OR DAMAGE
  • Check the constant velocity (cv) boots and joints for wear or damage

Was damage found?
Yes Inspect the CV joints and halfshaft. Replace components as necessary.
REFER to: Halfshaft (205-04 Front Drive Halfshafts, Removal and Installation).
No GO to C3

C3 CHECK THE TORQUE ON SUSPENSION AND STEERING SYSTEM FASTENERS
  • Check the lower arm nut torque
  • Check the tie rod nut torque
  • Check the stabilizer bar link nut torque
  • Check the upper arm nut torque (If equipped)
  • Check the lower arm nut torque

Is the any of the suspension and steering fastener loose?
Yes Tighten the fastener to specification.
REFER to: Lower Arm (204-01B) .
REFER to: Front Stabilizer Bar (204-01A Front Suspension - LHD RWD, Removal and Installation).
REFER to: Upper Arm (204-01B) .
No Inspect the vehicle for any other symptoms related to the halfshafts.

PINPOINT TEST D: DRIVELINE CLUNK — OCCURS AS THE VEHICLE STARTS TO MOVE FORWARD FOLLOWING A STOP

Normal Operation and Fault Conditions

Halfshafts transmit rotary motion through constant velocity joints in a uniform manner. The outer CV joints use balls, have no length compensation and engage in the wheel hubs. The intermediate shaft (right side) is correctly positioned and secured in the differential by the intermediate shaft center bearing. The left CV joint is locked in the differential by a snap-ring.

Possible Sources

  • Loose hub nut
D1 CHECK FOR LOOSE HUB NUT
  • Check for loose hub nut.

Are any hub nuts loose?
Yes Tighten to specifications.
REFER to: Halfshaft (205-04 Front Drive Halfshafts, Removal and Installation).
No GO to D2

D2 CHECK THE TORQUE ON SUSPENSION AND STEERING SYSTEM FASTENERS
  • Check the lower arm nut torque
  • Check the tie rod nut torque
  • Check the stabilizer bar link nut torque
  • Check the upper arm nut torque (If equipped)

Is the any of the suspension and steering fastener loose?
Yes Tighten the fastener to specification.
REFER to: Lower Arm (204-01B) .
REFER to: Front Stabilizer Bar (204-01A Front Suspension - LHD RWD, Removal and Installation).
REFER to: Upper Arm (204-01B) .
No Inspect the vehicle for any other symptoms related to the halfshafts.

PINPOINT TEST E: CLICKING, POPPING OR GRINDING - OCCURS WHILE THE VEHICLE IS TURNING

Normal Operation and Fault Conditions

Halfshafts transmit rotary motion through constant velocity joints in a uniform manner. The outer CV joints use balls, have no length compensation and engage in the wheel hubs. The intermediate shaft (right side) is correctly positioned and secured in the differential by the intermediate shaft center bearing. The left CV joint is locked in the differential by a snap-ring.

Possible Sources

  • Inadequate or contaminated lubrication in the Constant Velocity (CV) joints
  • Another component contacting the halfshaft
  • Halfshaft or halfshaft circlip
E1 CHECK THE CONSTANT VELOCITY (CV) BOOTS AND JOINTS FOR WEAR OR DAMAGE
  • Check the constant velocity (cv) boots and joints for wear or damage.

Was wear or damage found?
Yes Inspect the CV joints and halfshaft. Replace components as necessary.
REFER to: Halfshaft (205-04 Front Drive Halfshafts, Removal and Installation).
No GO to E2

E2 CHECK THE HALFSHAFTS FOR CONTACT WITH ANOTHER COMPONENT
  • Check the halfshafts for contact with another component.

Is there contact between other components with the halfshaft?
Yes Repair as necessary.
REFER to: Halfshaft (205-04 Front Drive Halfshafts, Removal and Installation).
No GO to E3

E3 INSPECT THE HALFSHAFT OR HALFSHAFT CIRCLIP
  • Inspect the halfshaft or halfshaft circlip.

Was any damage found?
Yes Install halfshaft or halfshaft circlip as necessary.
REFER to: Halfshaft (205-04 Front Drive Halfshafts, Removal and Installation).
No Inspect the vehicle for any other symptoms related to the halfshafts.

PINPOINT TEST F: GRUNTING — NORMALLY ASSOCIATED WITH A SHUDDER EXPERIENCED DURING ACCELERATION FROM A COMPLETE STOP

Normal Operation and Fault Conditions

Halfshafts transmit rotary motion through constant velocity joints in a uniform manner. The outer CV joints use balls, have no length compensation and engage in the wheel hubs. The intermediate shaft (right side) is correctly positioned and secured in the differential by the intermediate shaft center bearing. The left CV joint is locked in the differential by a snap-ring.

Possible Sources

  • Halfshaft Constant Velocity (CV) joint binding
F1 CHECK THE OUTER CONSTANT VELOCITY (CV) JOINT FOR CORRECT SEATING INTO THE HUB
  • Check the outer constant velocity (cv) joint for correct seating into the hub.

Is the outer Constant Velocity (CV) joint seated correctly into the hub?
Yes Repair as necessary.
REFER to: Halfshaft (205-04 Front Drive Halfshafts, Removal and Installation).
No Inspect the vehicle for any other symptoms related to the halfshafts.

PINPOINT TEST G: DRIVELINE VIBRATION - OCCURS AT CRUISING SPEEDS

Normal Operation and Fault Conditions

Halfshafts transmit rotary motion through constant velocity joints in a uniform manner. The outer CV joints use balls, have no length compensation and engage in the wheel hubs. The intermediate shaft (right side) is correctly positioned and secured in the differential by the intermediate shaft center bearing. The left CV joint is locked in the differential by a snap-ring.

Possible Sources

  • Incorrectly seated Constant Velocity (CV) joint in the wheel hub
G1 CHECK THE OUTER CONSTANT VELOCITY (CV) JOINT FOR CORRECT SEATING INTO THE HUB
  • Check the outer CV joint for correct seating into the hub.

Is the outer Constant Velocity (CV) joint seated correctly into the hub?
Yes Repair as necessary.
REFER to: Halfshaft (205-04 Front Drive Halfshafts, Removal and Installation).
No Inspect the vehicle for any other symptoms related to the halfshafts.


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    Rear Stabilizer Bar Link. Removal and Installation

    Removal

    NOTE: Removal steps in this procedure may contain installation details.

    With the vehicle in NEUTRAL, position it on a hoist.
    Refer to: Jacking and Lifting (100-02 Jacking and Lifting, Description and Operation).

    NOTE: Use the hex-holding feature to prevent the stud from turning while removing the nut.

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