2.1 DESCRIPTION AND OPERATION OF CAMSHAFT AND ROCKER SHAFT/ENGINE BRAKE ASSEMBLY AND RELATED PARTS For EPA10 engines, the exhaust rocker arm shaft lubricating oil passages direct pressurized oil to the rocker arms. The exhaust rocker arm has two additional oil passages to operate the engine brakes. Oil for cylinders 1 through 3 is supplied by the Front Engine Brake Solenoid Valve. Oil for cylinders 4 through 6 are supplied by the Rear Engine Brake Solenoid Valve. 1. Exhaust Rocker Arm 7. Exhaust Camshaft 2. Exhaust Rocker Arm with Actuator Piston 8. Actuator Piston 3. Brake Rocker Arm 9. Exhaust Valve 4. Oil Passage for Cylinders 1, 2 and 3 10. Brake Cam Lobe 5.
Oil Passage for Cylinders 4, 5 and 6 11. Engine Brake Solenoid Valve, Front 6. Exhaust Rocker Arm Shaft 12. Engine Brake Solenoid Valve, Rear Figure 2-3 EPA10 Engine Brake All information subject to change without notice. 2-6 DDC-SVC-MAN-0081 2010 Copyright © 2010 DETROIT DIESEL CORPORATION