-3 Bolt EGR mounting flange.
removing a failed EGR cooler do not remove the EGR valve from the
bellows hot pipe. Remove the three nuts that attach the EGR valve
to the cooler and then suspend the EGR valve with a wire or similar
item to facilitate proper removal of EGR cooler.
-DO NOT dent bend
or damage bellows as doing so will require replacement of the bellows
hot pipe. (Reference Detroit Diesel technical bulletin 18SP609)