1
Bearing cap
8
Expander
2
Bearing shell
9
Second groove ring
3
Connecting rod
10
Top groove ring
4
Pin retainer
11
Piston pin
5
Piston
12
Piston pin bushing
6
Oil control ring
13
Connecting rod bolt
7
Third groove ring
14
Connecting rod bolt nut
Figure 104. Continued.
Take out the connecting rod bolts (13) and put them with their corresponding caps. Remove the pin retainers (4). Drive
out the piston pins (I1) and separate the connecting rods (3) and piston pin and bushings (12) from the piston. Press the
bushings from the connecting rod with an arbor press (par. 179).
b. Cleaning and Inspection.
(1) The connecting rod bearing shells should be free from nicks or scratches and show no signs of overheating.
An overheated bearing will show dark discoloration. Check the bearing shell thickness. The thickness
should be from 0.0952 inch to 0.0956 inch. Replace all connecting rod bearings if any bearing shell is worn
to less than the minimum thickness. If an undersize crankshaft is installed, undersize bearing shells must be
installed. Refer to paragraph 222c. Undersize bearings are available in two sizes: 0.010- and 0.030-inch
undersize.
(2) Clean the pistons by soaking them in carbon tetrachloride or similar solvent. Clean any carbon deposits.
Replace a cracked or broken piston. Check the pistons with a 5 to 6 inch outside micrometer caliper
(par. 179) to determine out of round by taking readings at several points around the diameter. The
diameter of the piston should be 5.4955 to 5.4965 inches at the skirt bottom. Check the piston clearance by
inserting the piston, top down, in the cylinder sleeve bore. Use a feeler gage. The clearance of the piston
skirt to cylinder sleeve should be 0.0035 to 0.0055 inches.
(3) Check cylinder sleeve diameter for size and concentricity using a 1 1/2 to 12 inch inside micrometer caliper
(par. 179). Take several readings the same way as checking pistons. If the sleeve diameter is greater than
5.501 inch, replace the sleeve (par. 225). If the sleeve diameter is between 5.500 and 5.501 inches and the
piston to sleeve clearance is greater than 0.0055 inches replace the piston. Check the gap clearance of
new piston rings
237
