TM 5-4930-244-14
e. Assembly. (Sheet 3 of 4 and 4 of 4).
NOTE
When assembling piston to connecting rod, ensure that when the piston and
connecting rod are in the engine the offset combustion chamber will be opposite
the push rods.
(1)
Install rod (1) into piston (6) and slide wrist pin (11) through hole (19) in piston (6) and rod (1).
(2)
Secure pin (11) to piston (6) with two rings (5).
(3)
Stagger gaps of rings (15, 16, 17) around circumference of piston (6) so gaps are not aligned with each other.
(4)
Lightly lubricate cylinder bore (10) with lubricating oil.
(5)
Compress rings (15, 16, 17) and install piston (6) and rod (1) In cylinder (7).
(6)
Install same shims (4) removed in step 3 of removal between crankcase (20) and cylinder (7).
(7)
Lightly lubricate crankshaft journal (21) with lubricating oil. Rotate crankshaft (22) until journal (21) is at TDC.
(8)
Install cylinder (7), piston (6), and rod (1) over studs (23). Make sure numbers on rod (1) are facing toward
camshaft side of engine (24). Turn crankshaft (22) while pushing down on piston (6) to gain access to rod (1)
CAUTION
Care must be taken to ensure the crankshaft is not turned when the Plastigauge is
in place, and all traces of it must be removed before final assembly of the bearing.
(9)
Place a piece of the correct size Plastigauge approximately 0.25 in. (6 35 mm) off center across the full width of
one bearing shell.
(10)
Install cap (3), making sure numbers on cap (3) and rod (1) are correctly matched and are on same side.
(11)
Install two screws (2) to rod (1). Torque screws (2) between 24-26 Ib-ft (33-35 Nm).
(12)
Remove screws (2) and cap (3). Measure gage (25) and check for 0.0011 inch to 0.0044 inch (0 028 mm to
0.112 mm) clearance. If clearance is good, thoroughly clean cap (3) and install on crankshaft (22). If clearance is
out of tolerance, replace crankshaft (Reference para. 6-4).
(13)
Apply sealing compound to threads of two new screws (2).
(14)
Install two screws (2) to rod (1). Torque screws (2) between 24-26 Ib-ft (33-35 Nm).
(15)
Set piston (6) at 0 25 inch (6.35 mm) before TDC.
(16)
Place three pieces of solder (26) an equal distance from one another on top piston (6). Make sure pieces of
solder (26) are not aligned with valves (27).
6-12
