Rainier AWD L6-4.2L (2007)
Fluid - Differential: Procedures
Front Drive Axle
Front Axle Lubricant Level Inspection
Front axle lubricant leaks can occur at the following locations:
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Axle shaft oil seals
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Differential carrier assembly mating surface
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Drain plug
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Fill plug
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Inner axle tube assembly to differential carrier assembly mating surface
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Pinion yoke oil seal
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Vent tube
Determining the Cause
While most front axle leaks may be easy to find, determining the cause may not be. A thorough inspection of the area around the leak may assist in
determining the cause of the leak.
Oil Seals
Lubricant leaks from a oil seal may be caused by any of the following:
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An improperly installed seal
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A distorted seal
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A worn seal
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A worn shaft
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A brittle seal lip
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A hardened seal lip
To determine the actual cause of the leak, clean the area around the leak. Observe the area of the leak and determine the if the seal or another component
is causing the leak. A worn seal surface will cause a leak at the sealing lip while a misaligned seal or a seal installed into a housing with an excessive
bore will cause the seal to leak at the outside surface of the seal. Hardened or cracked seal lips usually indicate the axle is operating beyond the normal
temperature limits for the axle. A seal whose sealing surface has been nicked or cut may indicate that the shaft has a rough, burred, or gouged surface and
will need to be inspected before the seal can be replaced.
Sealing Surfaces
Front axles components are assembled using specific sealers. A leak at a surface sealed with sealant is usually caused by a poor fit of the components but
can also be caused by the use of the wrong sealant. When correcting a sealant leak, inspect each component for distortion and for nicks or gouges that
may prohibit the sealant from sealing properly and when re-assembling the component, use the proper sealant.
Differential Carrier Assembly
Lubricant leaks at the differential carrier assembly can occur at the following locations:
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Drain Plug
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Fill Plug
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Vent tube
Drain and fill plug leaks are usually caused by a loose plug. A vent tube leak can be cause by a loose fitting vent hose or by a vent tube assembly whose
interior shield is stuck in the upside down position. Inspect the vent plug's interior shield for unrestricted movement, repair or replace the plug as
necessary. Drain or fill plug leaks can be repaired by either tightening the plug or by using an approved sealer on the threads on the plug.
