the oil rings, the fourth groove also holds an expansion
ring. The piston pins are held in place i in the piston with
two retaining rings to prevent contact with the cylinder
walls. The connecting rods are drilled for lubrication.
The connecting rods and caps are matched sets and are
marked with matched numbers. Always replace rods
and caps as a matched set.
255.
Carrier Engine Connecting Rod and Piston
Assemblies Removal and Disassembly
a. Removal.
(1) Remove the carrier engine cylinder head
(2) Remove the carrier engine oil pan (par.
(3) Remove the connecting rod and piston
assemblies as instructed on figure 66.
b. Disassembly. Disassemble the carrier engine
connecting rod and piston assemblies in numerical
sequence as illustrated on figure 67.
256.
Carrier Engine Connecting Rod and Piston
Assemblies Cleaning, Inspection, and Repair
a. Cleaning. Clean all parts with an approved
cleaning solvent and dry thoroughly.
b. Inspection and Repair.
(1) The standard finished size of the piston
pin is 4.524 to 4.539 inches long, diameter
is 1.7498 to 1.7500 inches. Fit in piston
boss is 0.018 to 0.003 inch, and 0.003 to
0.007 inch in rod bushing. The rod bushing
is 115r6 inches long, 1.941 to 1.944
inches outside diameter, and 1.7503 to
1.7505 inches inside diameter.
1
Oil tube
(2) The correct piston ring gap clearance for
2
Oil tube adapter
this engine is 0.018 to 0.032 inch. Install
3
Plug, pipe, 3/4 in. NPT
the piston ring in cylinder. Invert the piston
4
Screw, cap, 3/8-16 x 1 in. (32 rqr)
in the cylinder and push piston against the
5
Washer, lock, 3/8 in. (32 rqr)
ring until the ring is square with the
6
Oil tube mounting bracket
cylinder bore. Remove the piston.
7
Oil pan
(3) Check the piston ring gap with a feeler
8
Gasket
gage. If the gage exceeds 0.032 inch,
9
Nut, hex, 1/4-20 (8 rqr)
replace the ring. If the gap is less than
10
Washer, lock, 14 in. (8 rqr)
0.018 inch, file the end of the ring until
11
Handhold cover
proper clearance is obtained.
12
Gasket (2 rqr)
13
Handhold reinforcement ring
14
Stud, 1/4-20 x 7/8 in. (8 rqr)
15
Gasket
Figure 63. Carrier engine oil pan, exploded view.
TACO 5030A
118
