COOLING SYSTEM - M.93.Remove oil cooler by unscrewing the two nutson the ends of the oil cooler securing clamp.Replacement of the oil cooler is effected byreversing the above procedure.Dismantling1.Remove the oil cooler end covers by unscrewingthe securing setbolts.2.Remove the rubber "O" ring seals at each end ofthe cooler.3.Drive tube stack out of oil cooler casing.CleaningUnder normal circumstances, the gearbox oil coolerwill require little attention, providing the sea waterstrainer is efficient and is kept clean.After a lengthy period of service, it may benecessary to clean the tube stack and this may beeffected in a similar manner to that described for thecombined heat exchanger and lub. oil cooler.Re-Assembly1.Place the tube stack in its casing and fit the "O"ring seals over each end cover. It is advisableto renew these seals if they appear to be badlyworn or deformed.2.The end covers and securing setscrews shouldnow be replaced.3.Tighten the securing setscrews.THERMOSTATTo Remove (lowline engines)1.Remove water connection between header tankand exhaust manifold. To effect this, it isnecessary to slacken both hose clips and slidethe hose towards the exhaustmanifold.Removal of the two setscrews securing thewater pipe to the header tank will then permit itsremoval.2.Remove setscrews securing top cover ofthermostat housing and remove cover.3.Remove thermostat — see Fig. M.13.To Remove (earlier engines)1.Remove all water and lubricating oil connectionsto heat exchanger assembly.2.Unscrew the four setscrews securing the heatexchanger assembly to the thermostat housing,thereby disclosing the thermostat.Fig. M.11.Exploded view of Heat Exchanger Assembly,(earlier engines)
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