Rear differential leak – Ford TSB

How to fix a rear differential leak – Ford TSB Fix

Ford has issued a service bulletin #14-0057 to address a rear differential leak on the vehicles listed below and equipped with AWD and the 3.5L direct injected, turbocharged engine and AWD.

2011 Mercury Milan & Mariner
2011-12 Ford Fusion & Escape
2011-2013 Edge and Flex
2011 Ford Taurus
2011-2014 Explorer & Taurus
2011-2012 MKZ
2011-2013 MKT and MKX
2011-2014 MKS

How to inspect the rear differential leak

1.Inspect the rear drive unit for oil leaking from the rear

DB5Z-4022-A Rear differential vent

differential vent cap located on the rear cover.
a. If only a light residue is found around the cap, this is normal. This article does not apply.
2.Remove and discard the rear differential vent cap from the rear drive unit cover.
3.Install a new rear differential vent cap. Part # DB5Z-4022-A
4.Clean off any remaining residue.

The leak is most apparent in colder temperatures (32°F and below). The problem is caused by a stuck-open vent valve in the rear differential cap. Ford has redesigned the vent valve and issued a new part number to solve the problem (DB5Z-4022-A). Obtain the new valve from any Ford dealer and install it. That’ll eliminate the problem

©, 2014 Rick Muscoplat