Pistons and piston rings
(1)
Pistons
Inspect each piston for any abnormal wear of its
sliding surface, for cracks at the crown and for
evidence of melting or fusion. Examine the ring
grooves for stepped wear and sloped wear. Replace
pistons found
in
bad condition.
(2) Measure the outside diameter of piston in two direc
tions perpendicular to each other. If the diameter
exceeds the service limit, replace the piston.
Specifications
Unit: mm (in.)
Item
Standard
Service
limit
Standard
76 .90
0.25
77.15
Diameter
oversize
-0.2
(at skirt)
0.50
77.40
(-0.008)
oversize
0.75
77.65
oversize