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 TM 55-1905-223-24-5
NOTE
The Full Flow Cooling (FFC) engine has an oil pressure regulator that is part of the oil cooler and is located in
the front support of the cooler (FIGURE 3-3). The regulator controls the oil pressure before the oil flows
through the oil filter.
a.
Remove the regulator machine thread plug (5), spacer ring (4), and helical compression spring (3).
b.
Remove the regulator plunger (2) from the cooler support (1).
c. Remove the cooler support (5, FIGURE 3-4) and cover (14) from the housing (9) by removing
lockwashers (6), hexagon head capscrews (7), and assembled washer screws (15).
d.
Remove the lube oil circle cover gaskets (8, 13) and retaining rings (1). Discard the gaskets.
e. Remove and discard the preformed packings (2, 4). Be careful not to damage the fluid filter element
(3) when removing packing.
f. Remove the element (3) cooler core from housing (12). Remove retainer plug (9), valve disk (10), and
helical compression spring (11) from the housing (12).
REPAIR
a.
Check the regulator plunger (2, FIGURE 3-3).
(1)
Inspect the plunger (2) for scratches or other damage.
(2)
If scratch is deep enough to be felt with a fingernail, replace the plunger.
(3)
Inspect helical compression spring (3) for damaged or broken coils. Replace if damaged.
(4)
Use a valve spring compressor to compress the helical compression spring (3) to 1.820
inches (46.23 mm). The force required must be between 22 and 26 pounds. Replace if necessary.
b.
Clean and inspect the cooler element (fluid transmission center) (3, FIGURE 3-4) as follows:
WARNING
The fumes from the cleaning solution are dangerous. Use the solution in open air or in a room that has proper
ventilation. Wear safety glasses and gloves.
3-11
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