COOLING SYSTEM - M.9
3.
Remove oil cooler by unscrewing the two nuts
on the ends of the oil cooler securing clamp.
Replacement of the oil cooler is effected by
reversing the above procedure.
Dismantling
1.
Remove the oil cooler end covers by unscrewing
the securing setbolts.
2.
Remove the rubber "O" ring seals at each end of
the cooler.
3.
Drive tube stack out of oil cooler casing.
Cleaning
Under normal circumstances, the gearbox oil cooler
will require little attention, providing the sea water
strainer is efficient and is kept clean.
After a lengthy period of service, it may be
necessary to clean the tube stack and this may be
effected in a similar manner to that described for the
combined heat exchanger and lub. oil cooler.
Re-Assembly
1.
Place the tube stack in its casing and fit the "O"
ring seals over each end cover. It is advisable
to renew these seals if they appear to be badly
worn or deformed.
2.
The end covers and securing setscrews should
now be replaced.
3.
Tighten the securing setscrews.
THERMOSTAT
To Remove (lowline engines)
1.
Remove water connection between header tank
and exhaust manifold. To effect this, it is
necessary to slacken both hose clips and slide
the
hose
towards
the
exhaust
manifold.
Removal of the two setscrews securing the
water pipe to the header tank will then permit its
removal.
2.
Remove setscrews securing top cover of
thermostat housing and remove cover.
3.
Remove thermostat — see Fig. M.13.
To Remove (earlier engines)
1.
Remove all water and lubricating oil connections
to heat exchanger assembly.
2.
Unscrew the four setscrews securing the heat
exchanger assembly to the thermostat housing,
thereby disclosing the thermostat.
Fig. M.11.
Exploded view of Heat Exchanger Assembly,
(earlier engines)
