Figure 3-77. Fan and support bracket (engine model 687C-18-ES), removal and installation
(c) Disconnect bypass line from water pump
connection in similar manner.
(d) Remove remaining coolant lines in a similar
manner.
(e) Install in reverse order.
b. On Engine Model D333TA.
The thermostat
housing, thermostat, and coolant lines are removed from
and installed on engine model D33STA in a manner
similar to that described above.
3-99. Water Manifold (Model 687C-18-ES)
a Removal and Installation.
(1) Remove the exhaust manifold from
crankcase (para 3-93).
Figure 3-78. Fan (engine model DJ33TA), removal or
(2) Remove high water temperature switch
installation
(3) Remove the water temperature transmitter
(a) Insert
thermostat
and
a
suitable
thermometer in a container 'of water.
(4) Remove thermostat housing (para 3-98).
(b) Heat water until thermostat is open, noting
(5) Remove 12 capscrews, washers, and
temperature when thermostat 'begins to open, and when it
lockwashers, that secure water manifold to crankcase.
is fully open. Thermostat should begin to open at 165F,
(6) Remove water manifold and six gaskets
and be fully open at 180F.
from engine.
(c) When
thermostat
does
not
meet
(7) Install in reverse order.
requirements of (b) above, it is defective and must be
b. Cleaning, Inspection, and Repair.
replaced.
(1) Scrape or brush all carbon, corrosion, or
(6) Coolant Lines removal and installation.
rust off parts, clean with an approved cleaning solvent
(a) Drain coolant system (para 3-19).
and dry thoroughly.
(b) Loosen two hose clamp (fig. 3-68) and
(2) Visually inspect water manifold for cracks,
remove hose from bypass line.
breaks, or warping.
3-86
