Rev D
9
5.2 General maintenance
While the unit is in operation, weekly inspection of the heat exchanger and its connections should be
maintained for leaks and externally visible damage.
BOWMAN
®
recommend that the tubestack should be cleaned and inspected annually and the o rings
should be renewed at this time.
Removal of the screws around the periphery of each end cover will allow the end covers and seals to be
removed. The tubestack can then be withdrawn from either end of the body.
5.3 Cleaning
Any cleaning solutions used must be compatible with the oil cooler materials. This should be confirmed
with the chemical’s supplier before use.
The chemical solution can be circulated through the heat exchanger or the unit can be disassembled and
the tubestack submerged in a container filled with cleaning fluid.
If necessary the fluid should be neutralized after cleaning and the unit should be flushed with fresh water
and dried.
Small diameter rods and brushes for tube cleaning are available from companies such as Easy Products
www.easyproductsltd.com
Replacement O rings should be fitted and the end cover bolts should be initially be hand tightened then
tightened in the sequence and to the torque figures below:
5.4
End cover bolt tightening sequence
End covers must be refitted in the correct orientation to ensure correct performance.
Oil Cooler
Series
Bolt Size
Torque (Nm)
Oil Cooler
Series
Bolt Size
Torque (Nm)
EC
M6
8
GK
M12
54
FC
M8
22
JK
M16
95
FG
M8
22
PK
M16
130
GL
M8
22
M10
37
M10
37
RK
M16
130
