Engine Brake - Detroit Diesel MBE 4000 Service Manual

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1.6

ENGINE BRAKE

Engine braking is controlled by a pneumatically-operated exhaust brake on the turbocharger in
conjunction with constant-throttle valves on the cylinder head. The exhaust back-pressure is used
by the exhaust brake to increase braking performance. The constant-throttle valves use the air that
escapes through them on the compression stroke to provide braking force.
The constant throttles are small valves which are built into the cylinder heads and positioned
opposite the exhaust valves. When open, a link is created between the combustion chamber and
the exhaust port. When the engine brake is switched on, the constant-throttle valves are opened
by pneumatic pressure.
NOTE:
When in emergency running mode (constant rpm), the engine brake can be activated
only when the engine is in overrun. When constant rpm has been attained, the engine
brake is automatically turned off.
For greater braking power, an optional turbo brake is available.
1.6.1
Remove the constant-throttle valve as follows:
1. Remove the cylinder head. Refer to section 1.2.1.
2. Remove the injector nozzle. Refer to section 2.4.1.
All information subject to change without notice.
6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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Constant-Throttle Valve Removal
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MBE 4000 SERVICE MANUAL
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1-45
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