TM 3-1040-263-34
d.
Reassembly.
(5) Remove nut (2, fig. 4-6), washer (3),
and stud (4) at bracket (7).
(1) Determine measurement 1 (fig. 4-11)
(6) Disassemble fight-stage heat exchanger
on the head (17, fig. 4 10).
(2) Determine measurement 2 (fig. 411)
end nuts from first stage OUT elbow and second state IN
elbow (fig. 3-3).
on the valve plate (14, fig. 4-10).
(7) Remove first-stage heat exchanger,
(3) Position plate seal (15) and plate
bracket (7, fig. 4-6) and bracket (5, fig. 4-10), and
gasket (16) into the head (17).
washer (6).
(4) Position the valve plate (14), with the
b. Disassembly.
discharge valve seat on the head (17) and press it in until
(1) Remove elbows (1 and 2, fig. 4-10).
it is bottomed; use an arbor press.
(5) Determine measurement 3 (fig. 4-11)
(2) Remove screws (3) and lockwashers
(4), using 9/64-inch hexagon key; and remove second
to insure proper installation of valve plate (14, fig. 4-10).
stage head (17) and assembled parts (7 through 16).
Measurement 3 (fig. 4-11) should be within 0.000 to
(3) Unscrew lockscrew (7), and remove
+0.001-inch of dimension 2 minus dimension 1.
valve stop (8) and spacers (9 through 11) from the
(6) Position discharge valve (13, fig. 4-10)
second stage head (17).
on the discharge valve seat of the valve plate (14).
(4) Extract discharge spring (12) from the
(7) Determine measurement K and M (fig.
second-stage head (17).
Then, using a 5/16-in,
diameter, two in. long nylon or hardwood rod (fig. 4-13),
(8) Obtain result of M minus K. Adjust this
press the second stage valve plate (14, fig. 4-10), from
result by adding spacers (9 through 11, fig. 4-10) as
the head, exerting )pressure on the discharge valve (13).
required to obtain a proper discharge valve travel
(5) Remove discharge valve (13) from the
between 0 015 to 0.019 inch.
second-stage valve plate (14).
(9) With proper thickness of spacers (9,
(6) Remove the plate seal (15) and plate
10, and 11) determined, position the discharge spring
gasket (16) from the second-stag, head (17).
(12) onto the discharge valve (13).
(7) Remove the intake valve (18), inlet
(10) Position the spacers and valve stop (8)
spring (19), and second-stage head gasket (20) from the
into the second head (17), and secure in place using the
second-stage cylinder (226).
lockscrew (7) Tighten lockscrew (7) to 12.5 pound-feet.
(8) Remove the second stage cylinder
(11) Place 0.040-iilch thickness shims (22,
(26) As with assembled parts from the compressor.
23, aid 24) on cylinder (26), and assemble with plunger
(9) Remove preformed packing (21),
(25) on crankcase. Rotate the crankshaft until the
plunger (25) is at top dead center while seated on the
shims (22, 23, and 24) and plunger (25) from second-
sage cylinder (26).
keystone assembly plunger interface surface, and
(10) Discard preformed packing (21).
determine measurement F (fig. 4-11).
c. Cleaning and Inspection.
(12) Position the head gasket (20, fig. 4-10)
(1) Remove carbon deposits in the
on the cylinder (26), and determine measurement D (fig.
second-stage head (17, fig. 4-10), discharge valve (13),
intake valve (18), inlet spring (19), discharge spring (12),
(13) Position the intake valve 118, fig.
and second stage valve plate (14), using a stiff bristle
4-10) and inlet spring (19) on the valve plate intake valve
brush and drycleaning solvent.
seat.
Depress anal flatten the inlet spring, and
(2) Clean remaining metal parts in
determine measurement C (fig. 4-11).
drycleaning solvent.
(14) Obtain head clearance by adding
(3) Apply compressor lubricating oil to
dimension F to the difference between dimensions C and
cleaned parts to prevent rust.
D. Add more shims (22, 23, and 24, fig. 4-10) to obtain
(4) Inspect all pails for wear or damage.
head clearance between 0.035 to 0.041 inch.
(5) Inspect all threads for damage.
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