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 TM 55-1905-217-34
(3) Remove nuts (6), washers (4), and gaskets (5).
(4) Before further removal, station maintenance personnel beneath Keel cooler to lower it when completely
detatched from recess.
(5) Remove cooler support nuts (7), washers (8), and gaskets (9) and lower the Keel cooler (12) from recess.
Remove gasket (11).
b. Cleaning and Flushing.
(1) Prepare a cleaner solution as follows: In a full gallon container, place 2/3 water and 1/3 Muriatic acid (by
volume). After stirring thoroughly, add one pound of Oxalic acid and stir until Oxalic acid dissolves.
(2) Fill cooler with cleaning solution.
(3) Allow solution to stand for a minimum of one minute, but at least until bubbling stops. Empty into sewer or
disposal system and flush with fresh water.
(4) Refill cooler with solution and allow to stand until bubbling stops.
(5) Empty cooler of all the cleaning solution and flush cooler thoroughly with hot water.
c. Inspection, Testing, and Repair.
(1) Provide seal of one inlet to hold air under pressure. (Approximately 20 psi.)
(2) Prepare fitting for second inlet that has air line fitting.
(3) Install both inlet fittings.
(4) Pressurize cooler to approximately 10 psi and submerge cooler in clear water not allowing "seals" to be
submerged.
(5) Observe any air bubble that would indicate a leak.
(6) If a leak is found, cooler must be replaced.
NOTE
Depending on nature of location of leak, cooler may be repairable.
(7) Inspect tubing for bends or dents.
(8) Inspect inlets for damage to lip or threads.
(9) Straighten or replace damaged tubing.
(10) Replace defective inlets.
(11) Replace all gaskets.
(12) Replace a Keel cooler that is damaged beyond repair.
d. Installation.
(1) Fit mounting gasket (10, fig. 3-30) onto cooler, making certain that cooler surface is free of any debris.
(2) Set cooler into recess in craft hull.
(3) Place support gaskets (9) and then washers (8) onto support bolts. Fit nuts (7) onto bolts and tighten to 7-9
lb-ft of torque.
(4) Place inboard gaskets (5) onto inlet pipes of cooler and then the washers (4).
(5) Fit pipe nuts (6) onto pipes and tighten to 7-9 ft-lb torque.
(6) Place hose clamps (3) onto pipes of cooler and tubing of water system.
(7) Slip rubber hose (2) onto pipes of cooler and water system tubing being certain that hose is fit to allow
clamps to have a good grip on hose.
(8) Move clamps onto ends of hose and tighten clamp screws.
(9) Cooling system may now be filled with required solution.
NOTE
The approximate capacity of each cooling system is 25 gallons.
When adding antifreeze, refer to TM 55-1905-217-12.
3-9. Blower Assembly
a. Removal. For more simplified removal of the blower assembly; the governor drive, fresh water pump, fuel oil
pump, and blower drive shaft cover should be removed altogether with the blower assembly.
(1) Drain the cooling system.
(2) Refer to Operator and Organizational Maintenance Manual TM 55-1905-217-12, paragraph 4-30, and
remove the governor control housing assembly.
(3) Disconnect the fuel lines at the fuel pump.
(4) Loosen the fresh water pump connections at the pump cover (inlet) and the cylinder block.
(5) Remove the air silencer and air inlet screen from the blower.
(6) Remove blower drive shaft as follows:
(a) Remove the six bolts that secure the flywheel housing small hole cover.
(b) Remove the snap ring and then pull the blower drive shaft out of the drive assembly.
(c) A broken drive shaft indicates an unusual loading which may have been caused by a bearing failure
or other malfunction. Inspect the blower drive, blower rotors and the housing before replacing the drive shaft.
NOTE
Some shafts have a tapped hole in the end which can be used as an aid in removing the shaft.
(7) Loosen the blower drive shaft cover seal clamp at the blower drive gear hub support.
(8) Remove the bolts and plain washers securing the blower to the cylinder block. Slide the blower slightly
forward, withdraw the blower drive shaft cover from the seal, then lift the blower away from the cylinder block.
(9) Remove the three bolts and seal washer assemblies securing the fuel pump to the blower rear end plate
cover, then remove the fuel pump, gasket and drive coupling fork.
(10) Loosen the seal clamp securing the blower drive shaft cover to the blower end plate cover, then remove
cover, seal and clamp from the end plate cover.
3-40
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