MACK LEU 2012: ENGINE AND ENGINE COOLING:ENGINE

NHTSA Campaign ID Number: 15V275000

Production Dates: 2010-06-25 - 2015-04-30

Manufacturers Involved: Mack Trucks, Inc.

Manufacturer Campaign Number: SC0391

Component: ENGINE AND ENGINE COOLING:ENGINE

Potential Number Of Units Affected: 2124

Report Initiator: MFR MFR Report

Mack Trucks, Inc. "Mack" is recalling certain model year 2011-2016 Mack MRU and LEU trucks manufactured June 25, 2010, to April 30, 2015, and 2015-2016 LR6 trucks manufactured from December 18, 2014 through March 6, 2015. Excessive engine crankcase pressures may cause the 90-degree elbow of the vent tube assembly to detach from the crankcase ventilation breather, possibly allowing engine oil to come into contact with hot surfaces.

If engine oil comes into contact with a hot surface, there could be an increased risk of a fire.

Cummins will notify owners on behalf of Mack, and Cummins service centers will administer the repairs which include securing the ends of the 90-degree elbow and reprogramming the electronic control module "ECM" with software that can adjust the engine output under misfire conditions to limit crankcase pressures. These repairs will be performed free of charge. The recall began on June 12, 2015. Owners may contact Mack customer service at 1-800-528-6586 or Cummins Inc. at 1-800-343-7357. Mack's number for this recall is SC0391.

Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 'TTY 1-800-424-9153', or go to www.safercar.gov.