Page 24
DESCRIPTION AND OPERATION
Exhaust gases exiting the EGR valve are hot,
near 1200°F (649°C). As such, the two tubes and
four clamps are made of stainless steel to provide
maximum service life. The hot tube section has
an integral bellows that allows for expansion and
contraction as engine temperatures change.
Wire-mesh O-rings along with V-band clamps
(Figure 13) are used for a gas-tight seal at the
tube connections. The V-band clamps are
different sizes depending on hot tube and cool
tube use, with the cool tube being the smaller of
the clamps. The seals are one-time use only and
must be replaced anytime a tube is removed in
service. Clamps used to connect the cool-side
tubes generally can be reused. However, for the
hot-side tube connections, the clamps can be
reused, but the T-bolt and nut should not
be
reused. Threads of the clamp bolts used in the
latter connections are prone to corrode in the
hotter environment. When removed for service,
the threads can be damaged making it impossible
to properly torque and get a gas-tight seal with
the new connection.
The EGR hot tube clamp retaining nut may gall
on the threads of the T-bolt at clamp removal.
Whenever a hot tube clamp has been in-service
and is removed, always install a new T-bolt and
nut. The EGR hot tube clamps should not be
replaced unless a clamp component, other than
the T-bolt and nut, is damaged.
13
Figure 13 — EGR Tube Clamps
1. Cool Tube Clamp 2. Hot Tube Clamp
5-111.bk Page 24 Monday, July 10, 2006 2:26 PM
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