TM 5-4310-277-14
and 10).
(c) Install pins (7) and retaining rings (6).
b. Cleaning, Inspection and Repair.
(2) Install the assembled pistons and con-
necting rods into the cylinder block. Install the
Dry cleaning solvent, P-D-680, used to clean
cylinder block assembly to the crankcase. Tighten
parts is potentially dangerous to personnel
and property. Avoid repeated and
the cylinder block screws to 45 foot-pounds (6.2
kgm) torque.
prolonged skin contact. Do not use near
(3) Attach connecting rods to crankshaft and
open flame or excessive heat. Flash point of
secure with connecting rod cap (2, fig. 6-6) and
solvent is 100 F. (38 C.) - 138 F.
connecting rod bolt (1). Tighten bolt to 25 foot-
(59oC.).
pounds (3.5 kgm) maximum. The connecting rod cap
(1) Clean all parts with cleaning solvent,
and connecting rod are matched parts and should not
Federal Specification P-D-680, and dry thoroughly.
be interchanged.
(2) Inspect the cylinder for broken cooling fins
(4) Install the exhaust manifolds, head
and cracks, replace a damaged cylinder.
unloaders, interstage safety valve, tube assemblies
(3) Inspect the cylinder bore for wear, scoring,
and intake and exhaust valves as follows:
pitting, or other damage. Inspect the bores for out-
(a) Install the exhaust valve assemblies (47
of-round by placing an inside micrometer in the top
and 48, fig. 6-4) and the exhaust manifolds (45 and
of the cylinder bore and taking two measurements,
46), secure with screws (44).
90 apart. Repeat the procedure halfway down the
(b) Install intake valve assembly (43); then,
bore. The difference between the two measurements
install intake manifold (42) and secure with screws
is the amount the bore is out-of-round. Replace or
(41). Install the interstage safety valve (40).
resize the cylinder if the bore is over 0.002 inch (.005
(c) Install the intake valve assembly (39);
cm).
install intake manifold (38) and secure with screws
(4) Measure the clearance of the piston pin in
(37).
the piston pin bushing. Desired clearance is 0.0002
(d) Install bracket (35) to pilot valve (36)
and 0.0009 inch (.0005 and .002 cm). Maximum
and secure with screws (34).
allowable wear of piston pin diameter is 0.001 inch
(e) Install arm (33) and secure with screw
(.003 cm).
(32) and nut (31).
(5) Inspect the connecting rods for any visible
damage or misalignment. Realign slightly twisted
(f) Install bracket (30) and cylinder (29).
rods or replace if they are badly damaged.
(g) Install sleeve (27) and nut (26) on valve
(28) .
(6) Place the piston rings in the cylinder bore in
which they will be used and measure the ring gap
(h) Install tubes (25), branch tee (24),
sleeves (23) and nuts (22).
with a feeler gage. Position the piston ring square
with the cylinder bore about one half inch (1.27 cm)
(i) Install actuating tubes (21), tee (20),
sleeves (19), and nuts (18).
from the top. The correct gap for the small com-
pression and oil rings is 0.0012 (.003 cm) plus or
(j) Install body (17), nut (16) and tube (15).
(k) Install the air cleaner (14) back on the
minus 0.005 inch (.01 cm).
intake manifold and secure with setscrew ( 13).
(7) If the ring gap is less than the specified
(l) Install bodies (12), nuts (11), and
width, file across the butt ends of the ring to increase
breather tube ( 10).
the gap to the required tolerance. If the ring gap is
greater than 0.023 inch (.06 cm) for any ring, replace
(m) Install the bodies (9), nuts (8), and
the entire set of rings.
unloading tube (7).
(n) Install ferrules (6), nuts (5) and tube (4).
(8) Measure the ring groove in the pistons for
wear and side clearance, using a feeler gage between
(o) Install ferrules (3), nuts (2), and in-
the ring and groove side wall. The desired ring
tercooler tubes (1).
groove clearance is 0.0010 to 0.0025 inch (.003 to
(5) Install the handhole plate and new gasket as
follows:
.006 cm) for the low pressure rings and 0.0010 to
0.0045 inch (.003 to .01 cm) for the high pressure
rings.
and new gasket (3) with its attaching screws(1).
c. Assembly and Installation (Model BGR-
Tighten screws to 25 foot-pounds (3.5 kgm).
5M and HGR6-8M-1).
(b) Install plugs (4 and 8).
(c) Install gage (7), nipple (6), and cap (5).
(1) Reassemble the pistons and connecting
rods as follows. Lubricate each piston and con-
(6) Install compressor flywheel, as illustrated in
necting rod assembly with a light coat of engine oil.
(7) Install the V-belts, as illustrated in figure 6.
(13).
Change 1
6-10.2
