Cap bolt (2)
(3) to the connecting rod (11).
Connecting rod cap
(7) Remove the remaining pistons and
connecting rod assemblies in a similar
Piston ring, top (1)
Rotate the crankshaft as
necessary to provide easy access to each
second and third (2)
connecting rod cap.
Piston ring, bottom (1)
Retaining ring (2)
(8) Secure the connecting rod (11) in a vise
equipped with soft jaws and remove the
piston rings (5, 6, 7) with a piston ring
Piston pin bushing
(9) To disconnect the connecting rods (11)
from the pistons (10), remove the piston
pin retaining rings (8) and push the pin (9)
out of the piston (10) and piston pin
b. Cleaning, Ins pection, and Repair.
(1) Clean all parts in accordance with para
. If this does not remove the carbon
deposits, use a suitable chemical carbon
solvent that will not attack the aluminum
piston pin bushings (12).
(2) Clean the compression ring grooves of the
piston (10). This can be done with a
broken compression ring that has been
ground to a bevel edge.
(3) Using a standard aligning fixture, check
Figure 7-55. Piston, piston rings, and connecting
the connecting rod (11) for distortion and
rod assembly, disassembly and reassembly.
misalignment. Check the connecting rods
(11), caps (2), and bolts (1) for cracks with
magnetic particle test.
replace parts if cracks are detected.
(4) Inspect the connecting rod bearings (3, 4)
for scoring, chipping, flaking, pits, cracks,
and signs of overheating. Bright spots on
back of bearings indicate shifting and are
cause for replacement.
(5) Check the piston pin bushing (12) for
scoring or wear. Replace bushing if bore
is scored or if worn to more than 1.2523
inches (31.8084 mm).
bushing (12) from connecting rod (11) and
press in new one.
(6) Inspect the piston pin (9) for wear or
scoring. Replace pin if worn to less than
1.2478-inch (31.6941 mm) diameter.
Maximum allowable pin clearance in
piston is 0.0005 inch
Figure 7-56. Piston and connecting rod, removal.