Leakage Inspection

Leakage Inspection

Component Test

The PTU (Power Transfer Unit) may leak different color fluids, red for automatic transmission fluid and brown/black gear lube for PTU (Power Transfer Unit) fluid. The PTU (Power Transfer Unit) seals prevent these types of fluids from leaking externally. It is important to note which color of fluid is leaking to determine the most appropriate service procedure.

NOTE: Inspection of the seal's mating journal should be performed every time a seal is replaced. The mating part/journal should be replaced if it has any of the following conditions: Radial wear groove that can be felt by running a finger nail across it where seal lip runs. Scratches, pitting, galling, nicks or other shaft damage under or near where the seal lip runs. Discoloration or coked oil on the shaft where the seal lip runs. Shaft corrosion under or near where the seal lip runs. Sharp edges or burrs on the shaft lead in chamfer. NEVER use emery cloth on journal finishes, replace the part.

1. Inspect the RH (Right Hand) side of the PTU (Power Transfer Unit) for leaks. If no leaks are found, GO to Step 2.

NOTICE: Remove and replace leaking seals using the information found in the Intermediate Shaft Seal and Deflector or Cover Seal replacement procedure. The specified tools called out in this procedure allow seal replacement without causing damage to the PTU (Power Transfer Unit) casing/drive gear.

1. If the leak is red automatic transmission fluid, replace the PTU (Power Transfer Unit) intermediate shaft seal located inside the bore of the PTU (Power Transfer Unit) shaft, behind the deflector. REFER to Intermediate Shaft Seal and Deflector .

2. If the leak is brown/black gear lube, replace the PTU (Power Transfer Unit) larger cover seal located on the PTU (Power Transfer Unit) cover, behind the deflector. REFER to Cover Seal .










2. Inspect the LH (Left Hand) side of the PTU (Power Transfer Unit) for leaks.

1. If the leak is red automatic transmission fluid, replace the compression seal located between the PTU (Power Transfer Unit) and transmission. REFER to Power Transfer Unit (PTU) .

2. If the leak is brown/black and venting fluid from the top of the PTU (Power Transfer Unit), the PTU (Power Transfer Unit) is overfilled due to the input shaft seals leaking red automatic transmission fluid into the PTU (Power Transfer Unit). Replace the input shaft seals, REFER to Input Shaft Seal .