COOLING SYSTEM - M.7
tank and a machined bore into which the heat
exchanger tube stack is located.
(b)
A smaller aluminum cylinder into which the oil
cooler tube stack is located.
(c)
Two tube stacks each comprising a multiplicity
of small bore tubes running between two tube
plates.
(d)
Two sea water end covers.
(e)
A tie rod which passes between the end covers
and secures the assembly together.
Dismantling
When dismantling it is best to proceed in the order
given below:
1.
Remove the two sea water pipes from their
respective end covers.
2.
Disconnect the two oil pipes.
3.
Remove the brass cap nut.
4.
This end cover can now he removed.
5.
The other end cover complete with tie rod can
now be withdrawn. Care should be taken to
support the oil cooler and the spacing ring after
the tie rod has been removed, as this will not be
attached in any way to the main casing.
6.
The "O" seals can now be removed from the end
of the tube stacks allowing the latter to be
withdrawn from their respective casings.
7.
The main aluminum casing can now be removed
from the engine if necessary; this will entail
disconnection of the fresh water flanges.
Cleaning
If the tube stack appears badly fouled up, the best
method of cleaning is to use non caustic crystalline
solvents approved by the manufacturers.
Usually, the fresh water side, i.e., the outside of the
tubes are relatively clean as these are on the
Fig. M.9.
Exploded View of Heat Exchanger.
(lowline engines)
