DV11
Operation and Maintenance
144
Common Rail Fuel-injection System
Printed in Mar. 2005 PS-MMA0608-E1A
z The exhaust rocker arm moves up (as in normal injector cycle), forcing the master
piston upward and creating a high pressure oil flow (J) to the slave piston of the
braking cylinder. The check ball valve (K) in the control valve traps high pressure
oil in the master/slave piston system.
z Under the influence of the high pressure oil flow, the slave piston moves down,
momentarily opening the exhaust valves at a pre-determined amount of slave
stroke. The adjusting screw (L) uncovers a passageway in the slave piston, thus
allowing oil to flow back to the underside of the control valve, where it is stored for
the next cycle. Prior to top dead center position, the exhaust valve is forced open,
releasing the compressed cylinder air to the exhaust manifold.
z Compressed air escapes into the atmosphere, completing a compression braking
cycle.
NOTE:
Never remove any engine brake component with engine running. Personal injury
may result.
z Engine Brake is a relatively trouble free device. However, inspections and routine
maintenance are necessary to assure proper operation.
3.6.3. Engine brake disassemble and valve adjustment
z Clean engine thoroughly. Remove all accessory components required to remove
cylinder head covers. Set entire overhead as with no brake, refer to engine
manual procedures. (intake valve and exhaust valve)
Engine brake operation
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