1
The Bowman
heat exchanger
is combined with the
exhaust manifold and
includes the header
tank. It is an easy job
to remove the tube
stack for cleaning, so
there is no excuse for
not doing it every
couple of years. Undo
the hose clips on the
covers at each end of the header tank to free the tube stack,
which is secured inside the covers by the smaller clips.
2
Slide the tube
stack out of the
header tank. It can
be removed from
either end, whichever
is easiest.3
This tube stack
was filled with a
gel-like substance, which
reminded me to flush the
engine block through
with clean water.
4
An unwound
wire coat
hanger is an ideal
tool for running
through the
tubes as the
spiral section
provides a smooth
scraping action.
It is important to
clean each tube
individually, and
well worth the
effort to keep
the system
flowing freely.5
Flush the tubes through with clean water and also flush the heat
exchanger body to remove any residue from the heat exchanger.
Refit the tube stack into the header tank, ensuring that the ends of the
stack are located in the small sections of the end covers and that the
hose clips are gripping it securely.
Clean the heat exchanger Clean the oil cooler
1
The oil coolers are next, and this gearbox oil cooler will need
a couple of new hose clips once it has been cleaned!2
The inlet end
of the cooler
is the first point of
entry after the water
strainer, and some
weed has clearly
bypassed the
strainer and is
beginning to
block the tubes.
A few minutes
with the wire coat
hanger and they
will be perfectly
clean again.hose clips3
On this engine
the oil cooler is
hidden behind the raw
water pump, which
has to be removed
to allow the tubes to
be cleaned.Raw water pump4
As the raw water pump
cannot be serviced
without being removed it has
to come off anyway, and the
easiest method of removal
is to take off the mounting
bracket and pump as one unit.5
This now gives
easy access to
the engine oil cooler
for cleaning.Cooling system service
➜