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 TM 55-1905-223-24-1
l.
Repair piston cooling valve (66, FIG. 4-75).
(1) Remove all gasket material from housing. Clean with solvent. Dry with compressed air.
WARNING
Parts are under spring pressure. The parts can move suddenly with enough force
to cause personal injury. Use a tool that will control parts firmly.
(2) Remove capscrew (56), lockwasher (57), shouldered washer(58), valve stem (59),
preformed packing (60), spring (61) and valve piston (62).
(3) Clean parts. Dry with compressed air.
(4) Check piston (62) surface and housing (66) bore. Replace piston if unable to remove
scratches and marks with a fine crocus cloth.
(5) Measure free length of spring (61). Verify length is between 2.39 and 2.54 inch (60.7 and
64.5 mm).
(6) Use spring tester, to measure force of spring at working height of 1.75 inch (44.4 mm).
Verify spring force is between 11.5 and 12.8 1bf (51 and 57N). Replace spring if not to
specification.
(7) Lubricate piston (62) with clean engine lube oil. Install piston (62) in body (66). Ensure
plunger moves freely. If plunger does not move freely, disassembly, check for debris and
burrs, and reassemble.
(8) Install preformed packing (60) on valve stem (59). Lubricate preformed packing with clean
engine lube oil.
WARNING
Parts are under spring pressure. The parts can move suddenly with enough force
to cause personal injury. Use a tool that will control the parts firmly.
(9) Install spring (61), valve stem (59), shouldered washer (58), lockwasher (57), and capscrew
(58). Torque capscrew to 140 in-lb (16 N ).
m
(10) Inspect oil jumper cover (52) for cracks. Replace if cracked.
m.
Check piston cooling nozzle (36) for cracks, bends, and other damage. Check spray holes for burrs.
Do not remove pipe plug (34). Replace nozzle if damaged.
n.
Clean engine lifting fixture bracket (68), washer (69), and capscrew (70). Check for cracks, rust, and
corrosion. Replace if damaged.
4-97
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