TM 5-4310-358-14
(3) Measure the clearance of the piston pin to
(4) Position of the connecting rod bearing
the piston pin bushing. Check for proper fit. Align or
surface to the crankshaft is accomplished from the top of
replace connecting rods, if necessary.
the crankcase by reaching down along side connecting
rod to install lower element of connecting rod. Prior to
(4) Place the piston rings in the cylinder bore
attaching lower element of connecting rods (16) press in
with the piston ring square in the cylinder bore about 0.5
oil dipper (15) if they were removed. Use attaching bolts
inch (12.7 cm) from the top.
(10) and torque to 25 ft. lbs. torque.
(5) If the ring gap is less than the specified
(5) Lubricate each piston and connecting rod
width, file across butt ends of the rings to increase the
assembly with a light coat of engine oil before installing
gap to the required tolerance. If the ring gap is greater
cylinder block. In very cylinder head (37, fig. 5-7) with
than required, replace the entire set of rings.
piston ring clamps secured around the assembled
pistons and insert pistons into cylinder.
(6) Measure the ring groove in the piston for
wear. Replace piston if necessary.
(6) Carefully assemble the cylinder to the
crankcase, after first installing cylinder flange gasket
c. Reassembly and Installation.
(38). Secure cylinder to crankcase with capscrews (36)
torque limits of 45 ft.-lbs. torque.
(7) Normally, the intake (32 and 34) and
bearings (14) into connecting rods (16) if previously
exhaust (33 and 35) valves are replaced as an assembly
removed. If new piston bearings are to be installed, and
if wear or malfunction occurs. In the event the valves
are not prefit, ream the bearings. Refer to Table 5-2 for
were disassembled refer to figure 5-8 for reassembly.
recommended tolerances.
When reassembling intake and exhaust valves be sure
to seat large diameter of the spring (4, 18, 12 and 26) in
(2) Fit connecting rod into high pressure
the cages (3, 13, 17 and 27) as shown.
piston (18) and secure with piston pin (17). Secure
piston pin with retaining rings (11). Assemble low
(8) Install val ves into valve cavities of
pressure piston (13) in a similar manner.
cylinder. Install manifold assemblies (23, 25, 29 and 31)
and tighten capscrews securely.
(3) Install piston ring set (48) on the low
pressure piston and ring set (47) on the high pressure
piston.
When installing piston rings expand them
carefully and sufficiently to allow the ring to slide freely
shown on the exploded figure. Install muffler on low
over the piston to the proper position. Starting with the
pressure intake manifold (25) and secure with set screw
bottom ring, install piston ring in their proper grooves.
(11).
Stagger ring gaps so that they are not lined up.
5-19
