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 (1) Use a wrench on the two nuts (19) and tighten
defective bearing. Repack ball bearings and lay them on and
packing gland (8) just sufficiently to set the packing.
cover with a clean cloth while awaiting reassembly.
(2) When leak has stopped, back the nuts (19) off one
(3) Clean all gasket bearing surfaces. Use new
turn, then bring them up to gland just finger tight.
gaskets for (2) and (18) at reassembly.
(4) Inspect the impeller (27) and wearing ring (23) for
excessive wear. Replace when worn. Replace an impeller that
CAUTION
is heavily corroded.
Keeping packing gland (8) in too tight will
(5) Inspect oil seal (9). If deteriorating, or damaged,
cause overheating, and burn out the
replace. Replace the connector (5) if threads are defective.
packing.
e. Reassembly.
(1) Install impeller key on shaft (17). Place the impeller
3-19. Engine Raw Water Pump
(27) on shaft (17), followed by lockwasher (26) and locknut
(25). Tighten locknut securely, then bend tabs of lockwasher
to the fresh water pump, except that it furnishes raw (salt)
in place.
water to the cooling portion of the heat exchanger.
(2) Position shaft in bore of support bracket (21).
b. Maintenance. Perform maintenance on the raw water
Install wearing ring (23) in volute (1). Position volute on
pump exactly as described in paragraph 3-18 above.
support bracket (21) and secure with nuts (3).
(3) Install ring (4), packing (6), and packing gland (8).
3-20. Water Inlet Header
Replace clamp (20) and nut (19). Install connector (5).
a. General. The engine fresh water cooling system is a
(4) Install oil seal (9), bearing (10), washer (11), and
closed system, with the same water used over again in cycles.
spacer (12) over shaft (17).
The fresh water pump (para 3-18 above) draws water from the
(5) Install bearing (13) and retainer, then secure with
heat exchanger, and circulates the cooled water to the water
capscrews (14). Tighten the capscrews and secure with
inlet header. From the header, water is forced through each
safety wire.
individual cylinder, upward to the cylinder head. After cooling
(6) Install key in shaft (17) and slip driven gear (15) into
the fuel injectors, the water then moves to the exhaust
place over key. Install nut (16), tighten, then secure with
manifold for cooling the exhaust. The water then moves to,
cotterpin.
and through the heat exchanger, through an inlet on top of the
f. Installation.
exchanger to eliminate the possibility of air locks. After
(1) Position fresh water pump into oil and water pump
passing around the tubing of the raw water bundle, and being
drive housing. Be sure that teeth of driven gear mesh with
cooled, the water continues its circulation toward the inlet
drive gear, and bracket (21) fits over studs.
header, where it begins the engine cooling cycle again.
(2) Install nuts (7) on studs and tighten securely.
b. Inspection. In addition to watching the inlet and outlet
(3) Install and connect inlet valve (fig. 3-22) and short
thermometers for indication of improper operation, frequent
ell in discharge line.
inspections should be made to insure minimal buildup of
(4) Turn on fresh water, then fill engine and expansion
corrosion, or scale, inside the header. To do this, proceed as
tank (table 2-3).
follows:
(5) Bar the engine over to assure that fresh water pump
(1) When engine is not in operation, shutoff the valve at
turns freely.
line into the inlet header. Close the valve next in line after the
header, then drain the engine block.
has been replaced, or when leaking around the shaft, adjust
(2) Remove one bonnet and regulating valve (8, fig. 3-
the packing as follows:
3-57
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