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Group 25 Intake and Exhaust System
EPG Control Valve
The exhaust pressure governor is controlled by a valve
that regulates air pressure to the EPG.
The exhaust pressure governor operates using two dif-
ferent pressures:
•
When the exhaust pressure governor is activated
during starting and keeping the engine warm, the
control valve provides a control pressure of approxi-
mately 200 kPa (29 psi).
•
When the exhaust pressure governor is activated for
engine braking, the control valve provides a control
pressure of approximately 750 kPa (110 psi).
D12A
The D12A is provided with two solenoid valves, one for
controlling the starting and engine warming pressure
and one for controlling the pressure for engine braking.
Both solenoid valves are located in a bracket on the
cylinder head.
D12B
The D12B is provided with an EPG control valve that
controls both the starting and engine warming pressure,
and the pressure for engine braking. The valve is located
at the lower rear edge on the right-hand side of the cylin-
der block.
The EPG control valve on the D12B replaces the two
solenoid valves on the D12A to perform the same
function.
22
Fig. 23: EPG control valve, D12B
Design and Function
W2002624
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