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DESCRIPTION AND OPERATION
Boost Relief Valve (BRV) — Under certain
operating conditions, high boost pressures and
temperatures can be produced. To maintain
boost pressures and temperatures within design
limits, some AC engines have a boost relief valve
located at the mixer tube venturi inlet with piping
to the exhaust system.
No tampering with or removal of the boost air
pressure relief valve is to be performed. Any such
action will result in fault codes, power reduction
and reduced life of CMCAC and engine
components.
EGR Valve Heat Shield — To protect the EGR
valve, its harness connection, oil supply and
return lines from heat damage, an additional
shield has been added at the right side of the
engine. The additional shield surrounds the front
section of the exhaust manifold and passes under
the EGR valve to block heat radiating from the
manifold and turbocharger.
All right-side heat shields, including EGR and
EUP, are a mandatory part of the engine. The
heat shields must
be reinstalled if they are
removed for maintenance or repair. Failure to do
so will result in damage to the sensitive electronic
and mechanical components.
15
Figure 15 — EGR Valve and EUP Heat Shields
1. EUP Heat Shield (Outer)
2. EUP Heat Shield (Inner, Two Piece)
3. EGR Valve Heat Shield (Lower)
4. Cylinder Head
5. Exhaust Manifold
5-111.bk Page 26 Monday, July 10, 2006 2:26 PM
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