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6.7L Cummins Rocker Levers – Rocker Lever Housing – General Information

Depending on the type of crankcase breather system, two types of rocker lever housings are used.
• Rocker Lever Cover Crankcase Breather – An internal system which is part of the rocker lever cover assembly.
• Rear Engine Mounted Crankcase Breather – An external system which is mounted at the rear of the engine, above        the flywheel housing. The rocker lever cover vents the crankcase gases to the external system through a connection      at the rear of the engine.

Engines with a rocker lever cover mounted crankcase ventilation filter assembly use a rocker lever housing
without any injector wiring harnesses or connectors. The wiring and connectors are molded into the rocker lever
cover gasket.

Engines with a rear engine mounted crankcase breather use a rocker lever housing that contains the injector wiring
harness and connectors.