Lincoln Aviator: Front Drive Axle/Differential / Diagnosis and Testing - Front Drive Axle

Principles of Operation

Inspection and Verification

  1. Verify the customer concern.
  1. Visually inspect for obvious signs of mechanical or electrical 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 the Symptom Chart.

Symptom Chart - Front Differential

  Symptom Chart - Front Differential


Condition Possible Sources Actions
Axle overheating
  • Axle lubricant low
  • CHECK the lubricant level. FILL the axle to specification.
    REFER to: Specifications (205-03 Front Drive Axle/Differential, Specifications).
  • Incorrect or contaminated lubrication type
  • INSPECT the axle for damage. REPAIR as necessary. DRAIN and REFILL the axle to specification as necessary.
    REFER to: Specifications (205-03 Front Drive Axle/Differential, Specifications).
  • Bearing preload adjusted too tight
  • If low mileage unit, CHECK the ring and pinion for damage. INSTALL new front axle as necessary
    REFER to: Axle Assembly (205-03 Front Drive Axle/Differential, Removal and Installation).
  • Excessive gear wear
  • INSPECT all the axle gears for wear or damaged. INSTALL new front axle as necessary
    REFER to: Axle Assembly (205-03 Front Drive Axle/Differential, Removal and Installation).
Broken gear teeth on the ring gear or pinion
  • Insufficient lubrication
  • INSTALL a front axle assembly.
    REFER to: Axle Assembly (205-03 Front Drive Axle/Differential, Removal and Installation).
Differential side gears / pinion gears are scored
  • Incorrect or contaminated lubricant type
  • Drain and FILL the axle to specification.
    REFER to: Differential Draining and Filling (205-03 Front Drive Axle/Differential, General Procedures).
    Road test vehicle. If an observable symptom is present (noise from front axle), INSTALL new front axle assembly as necessary.REFER to: Axle Assembly (205-03 Front Drive Axle/Differential, Removal and Installation).
Lubricant leaking from the pinion seal, axle shaft oil seals
  • Vent
  • CLEAN the axle housing vent.
  • Damage in the seal contact area or pinion flange dust shield
  • INSTALL a new pinion nut and the pinion seal if damage is found.
    REFER to: Drive Pinion Seal (205-03 Front Drive Axle/Differential, Removal and Installation).
  • Damage in the seal contact area
  • INSTALL a new halfshaft seal as necessary. Inspect Halfshaft seal contact area. Install new halfshaft as necessary.
    REFER to: Axle Shaft Seal (205-03 Front Drive Axle/Differential, Removal and Installation).
Grease expelling from pinion splines
  • Missing / worn / damaged driveshaft to pinion circlip
  • Missing / Damaged front axle pinion stem O-Ring
  • REMOVE the Front Driveshaft. INSTALL New Circlip and O-Ring. INSTALL the new Front Driveshaft as necessary.
    REFER to: Front Driveshaft (205-01 Driveshaft, Removal and Installation).

Symptom Chart - NVH

NOTE: NVH symptoms should be identified using the diagnostic tools that are available. For a list of these tools, an explanation of their uses and a glossary of common terms, refer to Section 100-04. Since it is possible any one of multiple systems may be the cause of a symptom, it may be necessary to use a process of elimination type of diagnostic approach to pinpoint the responsible system.


REFER to: Noise, Vibration and Harshness (NVH) (100-04 Noise, Vibration and Harshness, Diagnosis and Testing).


  Symptom Chart - NVH


Condition Possible Sources Actions
NVH concern isolated to front axle using proper diagnostic tools. Symptom may be constant or only occurs under specific driving conditions
  • Axle lubricant low or contamination
  • CHECK the lubricant level. FILL the axle to specification.
    REFER to: Differential Fluid Level Check (205-03 Front Drive Axle/Differential, General Procedures).
    OR INSPECT front axle fluid, if required, Drain and FILL the axle to specification. REFER to: Differential Draining and Filling (205-03 Front Drive Axle/Differential, General Procedures).
  • Internal FDU (Front Drive Unit) damage
  • Remove side cover and inspect components for wear or damage. INSTALL a new FDU (Front Drive Unit) as necessary.
    REFER to: Axle Assembly (205-03 Front Drive Axle/Differential, Removal and Installation).
Driveline clunk - loud clunk when shifting from REVERSE to DRIVE
  • Loose or missing fasteners
  • CHECK all driveline fasteners for proper torque.
Driveline clunk — occurs as the vehicle starts to move forward following a stop
  • Loose front axle mount
  • CHECK the front axle for loose bolts. TIGHTEN to proper torque.
    REFER to: Axle Assembly (205-03 Front Drive Axle/Differential, Removal and Installation).
Driveline clunk — occurs during acceleration or from cruise to coast / deceleration
  • Rear driveshaft U-joint
  • Missing or damaged circlip on front axle pinion.
  • INSPECT the rear driveshaft U-joints for wear or damage. INSTALL a new rear driveshaft as necessary.
    REFER to: Rear Driveshaft (205-01 Driveshaft, Removal and Installation).
  • Install new circlip.
Grunting — normally associated with a shudder experienced during acceleration from a complete stop
  • Rear Driveshaft
  • INSPECT the rear Driveshaft. INSTALL the new rear Driveshaft.
    REFER to: Rear Driveshaft (205-01 Driveshaft, Removal and Installation).
Scraping noise — a continuous low pitched noise starting at low speeds
  • Intermediate shaft LH halfshaft seal deflector bent / damaged
  • INSPECT components for wear/damage. INSTALL a new LH Halfshaft seal as necessary.
    REFER to: Axle Shaft Seal (205-03 Front Drive Axle/Differential, Removal and Installation).
Driveline shudder – occurs during acceleration from a slow speed or stop
  • Rear driveshaft
  • INSPECT the rear Driveshaft. INSTALL the new rear Driveshaft.
    REFER to: Rear Driveshaft (205-01 Driveshaft, Removal and Installation).

Axle Fluid Analysis

The appearance of milky fluid could be caused by fluid contamination. Drain and refill fluid and retest for normal operation.
REFER to: Differential Draining and Filling (205-03 Front Drive Axle/Differential, General Procedures).

Analysis of Leakage

Clean up the leaking area enough to identify the exact source.

Axle Vent

A plugged vent will cause excessive seal lip wear due to internal pressure buildup. If a leak occurs, check the vent. If the vent cannot be cleared, install a new vent.

Drive Pinion Seal

Leaks at the drive pinion seal originate from the following causes:

  • Damaged seal
  • Worn seal surface on Pinion Nut

The service kit available comes with seal, nut, & deflector.

Differential Seals

NOTICE: When installing shafts, do not allow splines to contact seals during installation or damage to the seals may occur.

The front axle fluid level is above halfshaft. Top-off the fluid level after replacing either differential seal. The seals are one time use and should be replaced whenever the RH halfshaft or intermediate shaft is removed.

RH halfshaft seal is a typical unitized seal found on many applications. The LH differential seal is the intermediate shaft to oil pan O-Ring.

The intermediate shaft also contains a differential seal to prevent gear lubricant from entering the intermediate shaft. This seal is serviced with the intermediate shaft.

    Description and Operation - Front Drive Axle and Differential

    The 6.5-inch ring gear rear differential axle has 3.31, 3.58 and 3.73 gear ratio versions. Front Drive Axle and Differential The front drive axle consists of: A cast-aluminum center section, a removable cast-aluminum differential housing cover Integral-type housing hypoid gear design (center of the pinion set below the centerline of the ring gear)...

    General Procedures - Differential Draining and Filling

    Materials Name Specification Motorcraft® SAE 75W-140 Synthetic Rear Axle LubricantXY-75W140-QL WSL-M2C192-A  Draining With the vehicle in NEUTRAL, position it on a hoist...

    Other information:

    Lincoln Aviator 2020-2022 Service Manual: Diagnosis and Testing - Crankcase Ventilation


    Diagnostic Trouble Code (DTC) Chart 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).   Diagnostic Trouble Code Chart Module   DTC Description Action   PCM P04DB:00 Crankcase Ventilation System Disconnected: No Sub Type Information   GO to Pinpoint Test HG   PCM P051A:00 Crankcase Pressure Sensor A Circuit: No Sub Type Information   GO to Pinpoint Test HG   PCM P051B:00 Crankcase Pressure Sensor Circuit Range/Performance: No Sub Type Information   GO to Pinpoint Test HG   PCM P051C:00 Crankcase Pressure Sensor Circuit Low: No Sub Type Information   GO to Pinpoint Test HG   PCM P051D:00 Crankcase Pressure Sensor Circuit High: No Sub Type Information   GO to Pinpoint Test HG   PCM P051E:00 Crankcase Pressure Sensor A Circuit Intermittent/Erratic: No Sub Type Information   GO to Pinpoint Test HG   PCM P2282:00 Air Leak Between Throttle Body And Intake Valve: No Sub Type Information   GO to Pinpoint Test HG   PCM U060E:00 Lost Communication With Crankcase Pressure Sensor: No Sub Type Information   GO to Pinpoint Test HG Global Customer Symptom Code (GCSC) Chart Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices...

    Lincoln Aviator 2020-2022 Service Manual: General Procedures - Wheel to Hub Runout Minimization


    Check NOTE: Wheel-to-hub optimization is important. Clearance between the wheel and hub can be used to offset or neutralize the Road Force® or run-out of the wheel and tire assembly. For every 0.001 inch of wheel-to-hub clearance, the Road Force® can be affected between 1 and 3 pounds depending on the tire stiffness...

    Categories

    Child Safety Locks

    When the child safety locks are set, you cannot open the rear doors from the inside.

    Lincoln Aviator. Child Safety Locks

    The child safety lock control is on the driver door.

    Press the control to switch the child safety locks on. Press the control again to switch them off. A light on the child safety control illuminates when you switch them on.

    read more

     
    Copyright © 2022 www.liaviator2.com