General InformationOn some AMU (Air Management Unit) pressure protection valves manufactured by Norgren, the internal O-ring may jump out of its groove, allowing the air to blow by the O-ring. This results in an air leak, with virtually no air flow from the secondary air supply to the AMU modules downstream of the pressure protection valves (air flow reduced by 99 percent).
When this condition ex
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Applicable Vehicles
M2 platform vehicles built after January 3, 2024 with a Cummins B6.7 engine certified to GHG24 requirements (Cummins B6.7 CM2450 B155B engines). These engines use an oil pressure sensor, instead of an oil pressure switch.
This solution does not apply to any other Cummins engines.
NOTE: As of March 6, 2024, Cummins has provided a "clean date" for each engine ma
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