COOLING SYSTEM - M.7tank and a machined bore into which the heatexchanger tube stack is located.(b)A smaller aluminum cylinder into which the oilcooler tube stack is located.(c)Two tube stacks each comprising a multiplicityof small bore tubes running between two tubeplates.(d)Two sea water end covers.(e)A tie rod which passes between the end coversand secures the assembly together.DismantlingWhen dismantling it is best to proceed in the ordergiven below:1.Remove the two sea water pipes from theirrespective 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the brass cap nut.4.This end cover can now he removed.5.The other end cover complete with tie rod cannow be withdrawn. Care should be taken tosupport the oil cooler and the spacing ring afterthe tie rod has been removed, as this will not beattached in any way to the main casing.6.The "O" seals can now be removed from the endof the tube stacks allowing the latter to bewithdrawn from their respective casings.7.The main aluminum casing can now be removedfrom the engine if necessary; this will entaildisconnection of the fresh water flanges.CleaningIf the tube stack appears badly fouled up, the bestmethod of cleaning is to use non caustic crystallinesolvents approved by the manufacturers.Usually, the fresh water side, i.e., the outside of thetubes are relatively clean as these are on theFig. M.9.Exploded View of Heat Exchanger.(lowline engines)
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