OEM Mercury Differential Cover

Mercury Differential Cover Parts and Q&A

• Axle Cover, Rear
  4W1Z-4033-BA
  Q: What Preparations Are Necessary Before Servicing the Housing Differential Cover on Mercury Grand Marquis?

  A:

  The service and repair process of a differential housing cover requires users to disable the air suspension system by cutting the power at the air suspension switch on the left-hand side of the luggage compartment preventing spring inflation or deflation. Also depower the fire suppression system when it exists in the vehicle. The differential housing cover removal begins once the vehicle is positioned on a hoist in neutral gear and all bolts from the cover and differential housing lubricant draining process have been completed. The machined areas of both cover and differential housing need to be cleared from oil residues before silicone sealant application. The interior of the rear axle needs protection from contamination throughout cleaning activities. The differential housing cover requires installation during the first 15 minutes of silicone sealant application with a continuous bead of sealer and silicone gasket. Fill the axle with lubricant only after silicone cures for at least one hour. To install the differential housing cover you must first secure the axle guard if present then fasten the bolts via the star pattern to a torque of 45 Nm (33 lb-ft). Screw and tighten the axle tag bolt to 31 Nm torque (23 lb-ft torque). When working with Traction-Lok axles you should add 118 ml (4 oz) additive friction modifier to the rear axle before removing the axle fill plug yet ensure that the tool recess stays clean to achieve proper engagement of the tool. Reinstall the fill plug after pouring 5.0 pints of specified lubricant by tightening it to 30 Nm (22 lb-ft). Vehicle owners must activate their fire suppression system during repowering operations; additional steps are required to actuate air suspension control systems before performing a vehicle descent.
• Differential Cover, Front
  2L1Z-4033-CA
  Q: How to Properly Maintain and Fix a Differential Cover on a Mercury Marauder?

  A:

  The first step of differential housing cover maintenance involves shutting off air suspension electrical power through the left-luggage compartment switch because it prevents unnecessary air spring inflation or deflation during driving. Support the automobile first then stand the differential housing cover off by removing bolts while draining the lubrication from the housing components. Both machined surfaces must be clean from oil contamination before installation while keeping inside the rear axle area sealed to avoid dirt intrusion as you perform cleaning operations. A continuous bead of silicone sealant should be applied to the differential housing cover which must be installed before the 15-minute sealant-drying time ends. The axle needs at least one hour during silicone curing time before adding lubricant. First secure the differential housing cover and thread in its bolts. The procedure for filling Traction-LOK axles requires 118 ml (4 oz) of additive friction modifier which should be added before removing the axle fill plug and ensuring tool recess cleanliness. Reinstall the fill plug after adding 1.8 liters (3.75 pints) of the right lubricant to the rear axle. You must reinitiate vehicle air suspension before carrying out a vehicle descent after installing new suspension air components.