TM 5-3825-229-14&P
6-11. PISTONS AND CONNECTING RODS (cont)
c.
Cleaning and Inspection (cont).
(8)
Measure the outside diameter of piston pin and the inside diameter of connecting rod bushing. Replace
connecting rod bushing if clearance is greater than 0.0020 in. (0.05 mm). Pin outside diameter should be
1.2596 to 1.2598 in. (31.995-32.00 mm). Bushing bore inside diameter should be 1.2599 to 1.2601 in.
(32.003-32.009 mm).
(9)
Inspect connecting rod bearings for scoring, chipping, cracking or signs of overheating. Replace bearings if
damaged. Replace bearing shells if any bright spots are found.
(10) Measure thickness of connecting rod bearings. Thickness should be a minimum of 0.0738
in. (1.875 NM). Maximum thickness should be 0.0752 in. (1.910 Nm).
(11) If any components or the piston assembly do not meet the above specifications replace the
component or assembly.
d.
Assembly.
NOTE
Each connecting rod and bearing cap should have been numbered during disassembly for identification and must be
installed in the cylinder from which it was removed. Install piston assembly in engine with connecting rod identification
numbers facing camshaft side of engine and the piston swirl chamber toward intake side.
(1)
Press connecting rod bushing (9) in connecting rod. Be sure oil hole lines up with the connecting rod (3) oil
hole. The connecting rod bushing must be reamed to obtain the correct inside diameter.
NOTE
A new piston pin installed in a new bushing at 70°F (21C) should be a thumb-push fit.
(2)
Install one retaining ring (6) in the piston pin hole with sharp edge of retainer facing outward.
(3)
Insert upper end of connecting rod (3) into piston, with swirl chamber of piston (8) positioned opposite
connecting rod identification numbers.
(4)
Lubricate piston pin (7) with oil (OE/HDO) and push it into piston (8) and connecting rod (3).
(5)
Install other retaining ring (6) with sharp edge facing outward.
CAUTION
Be careful not to nick the bottom of piston skirt when a connecting rod assembly is secured in a vise. Use protective
jaws, wooden blocks or a cloth to protect rod and piston from nicks that could lead to piston or connecting rod failure.
6-26
