Service Manual

Exhaust Outlet Connection ISB, ISBe and QSB (Common Rail [...]
Page 11-10 Section 11 - Exhaust System - Group 11
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If exhaust pressure exceeds the specification, inspect the
exhaust piping for damage. Refer to the equipment
manufacturer's repair instructions.
Remove the test equipment.
Install a pipe plug into the pressure tap port, if applicable.
Exhaust Outlet Connection (011-017)
General Information
NOTE: This procedure applies to marine applications. The
exhaust outlet connection to the turbocharger applies to
all marine engines with wet exhaust systems. The
instructions involving the integrated drive system do not
apply to all marine applications.
The Zeus™ drive package uses an integrated exhaust
system. An integrated exhaust system has a wet exhaust
routed through the pod drive and exiting through the
propeller hub. Because the exhaust discharges under
water, an idle exhaust bypass circuit is required to reduce
noise and vibration reduction at idle. The boat builder is
expected to provide the hoses, waterlift muffler, and
through-hull fittings for this circuit. There is a 50.8 to 76.2
mm [2 to 3 in] outlet port on the integrated exhaust system
for QSB applications, which will be the customer interface
point for the idle bypass system. The outlet port for QSC
applications is 76.2 mm [3 in] wide. The main exhaust
connection at the engine is available as a standard 90-
degree elbow, or an exhaust riser, if needed.