B3.9 and B5.9 Series Engines
Sea Water Heat Exchanger (008-053)
Section 8 - Cooling System - Group 08
Remove the raw water transfer tubes from the aftercooler.
Loosen the T-bolt clamps on the aftercooler air inlet and air
outlet hose couplings. Remove the hose couplings from the
aftercooler. Engines equipped with the air heater will re-
quire removal of the heater element wiring; some engines
have the throttle cable attached to the aftercooler that will
Remove the two hex-head flange capscrews that hold the
cast aftercooler to the flywheel housing bracket and the two
that hold the aftercooler to the intake manifold bracket.
Remove the aftercooler.
To cool the intake air properly, the core must be positioned
with the flat sides to the front and rear. When the core is
correctly positioned, the tube rows will be at 90 degrees to
the engine centerline as shown in the illustration. Be sure
the o-rings on each end of the core are in position to fit into
the housing chamfers when the core is installed.