COOLING SYSTEM - M.8closed water circuit. The inside of these tubes whichhave the raw water (sea water) passing through themare more likely to require cleaning.If these are not badly scaled enough to require thesolution treatment described above, they can be cleanedby pushing a length of 1/8 in (3.2 mm) diameter steel roddown the tubes to dislodge all foreign matter. It isimportant to note that when carrying out this exercise,the rod should be pushed through the tubes in theopposite direction to that in which the water flows. Donot use undue force to push the rod through the tubes.The other components of the assembly should becleaned before re-assembly and as these have nohidden features, no special instructions are considerednecessary.Re-AssemblyIf the main aluminum casing has been removed fromthe engine it is best to refit this to the engine first beforere-assembling the heat exchanger itself, although, ifconditions are too cramped, it is quite possible tocompletely re-assembly the heat exchanger first, andthen re-attach it to the engine.1.Place the two tube stacks in their respectivecasing and fit the "O” seals over each end. It isadvisable to renew these seals if they appearbadly worn or deformed.2.The complete oil cooler should now be slid alongthe tie rod, taking care that the tube stack islocated in the end cover.3.The spacing ring should be replaced in positionand the tie rod complete with oil cooler assemblyfitted to the main casing.4.The other end cover can be replaced and thecap nut complete with its copper and asbestoswasher refitted. This cap nut should betightened to a torque not exceeding 25 Ibf ft (3,5kgf m) - 34 Nm.GEARBOX OIL COOLERTo Remove1.Uncouple inlet and outlet water connections tothe oil cooler.2.Remove inlet and outlet oil pipes.Fig. M.10.Exploded View of Lubricating Oil Cooler and Filter.(lowllne engines)
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