TM 9-2320-272-24-4
5-10. PISTON AND CONNECTING ROD MAINTENANCE (Contd)
f. Installation
NOTE
l Before installation, ensure all pistons have been properly
assembled and lubricated.
l If old pistons are being installed, ensure they are installed in
same location from which they were removed.
Remove two screws (5) and rod cap (4) from connecting rod (2).
1.
Apply coat of lubricating oil to piston (1), connecting rod (2), and upper bearing shell (3).
2.
Position tang (6) on new bearing (3) to groove (7) in connecting rod (2) and snap into place.
3.
NOTE
Ensure piston ring gaps are staggered so they are not in line with
each other or piston pin.
Position ring compressor (10) over piston (1) and tighten with Allen wrench.
4.
CAUTION
Assistant must guide connecting rod through cylinder from oil pan
side of block to avoid damaging liner.
NOTE
Ensure numbered side of connecting rod is toward the camshaft
side of engine block.
Carefully insert connecting rod (2) in cylinder liner (9) and hold ring compressor (10) right and
5.
firmly seated against engine block (8). Ensure crankshaft journal (12) is at bottom dead center.
CAUTION
Ring compressor must be held firmly against engine block to
l
prevent compressor from sipping and causing piston ring
breakage when pushing piston into cylinder liner.
l Do not force piston assembly into liner. If piston does not install
freely in liner, remove and check for broken rings.
NOTE
Assistant will guide rod onto crankshaft journal to prevent
damage to journal and liner.
Push piston (1) through ring compressor (10) until all piston rings are well into cylinder liner (9) in
6.
engine block (8).
Drive piston (1) and rod (2) into cylinder liner (9) with rubber or wooden mallet handle until upper
7.
rod bearing shell (3) seats on crankshaft journal (12).
Apply lubricating oil to lower connecting rod bearing shell (11).
8.
Position new bearing shell (11) in rod cap (4) and install rod cap (4) so numbered side is matched to
9.
numbered side of rod (2). Ensure tang (6) on bearing shell (11) is aligned with groove in rod cap (4).
Apply lubricating oil to screw (5) threads and install screws (5) through rod cap (4) and tighten
10.
Check connecting rod clearance by following task a.
11.
5-76
