Top Ring and Intermediate Ring

TM 9-2320-312-24-2

Specifications Section

Top Ring and Intermediate Ring

Clearance between the oil groove and the oil control

piston ring ................................... 0.033 0.079 mm

(0.0013 0.0031 inch)

(3) The top ring has the mark "UP-1".

The ends of the oil control piston ring have a

Install the piston ring with the side marked "UP-1"

clearance when the ring is installed in a cylinder

toward the top of the piston. The colored stripe

with a specific bore size.

faces to the right of the ring end gap.

Cylinder bore size ............. 110.03 mm (4.332 inch)

The ends of the piston ring have a clearance when

the piston ring is installed in a cylinder with a

Clearance ..... 0.45 0.15 mm (0.018 0.006 inch)

specific bore size.

The oil control piston ring has an increase in

Cylinder bore size ............. 110.03 mm (4.332 inch)

clearance for each 0.03 mm (0.001 inch) increase

in the cylinder liner bore.

Clearance ......... 0.4 0.1 mm (0.016 0.004 inch)

Increase ................................. 0.09 mm (0.004 inch)

The piston ring has an increase in clearance for

each 0.03 mm (0.001 inch) increase in the cylinder

After the piston rings have been installed, rotate the

liner bore.

piston rings so that the end gaps are 120 degrees

from each other.

Increase ................................. 0.09 mm (0.004 inch)

(6) Piston skirt

(4) The intermediate ring has the mark "UP-2".

Lubricate the entire piston in zone (A) prior to

Install the piston ring with the side marked "UP-2"

assembly into the cylinder block. Use clean engine

toward the top of the piston. The colored stripe

oil.

faces to the right of the piston ring end gap.

Thickness of the new piston ring ... 2.98 0.01 mm

Piston Pin Bore

(0.1173 0.0004 inch)

(7) Piston pin

The ends of the piston ring have a clearance when

the piston ring is installed in a cylinder with a

Piston pin bore diameter that is in the crown

specific bore size.

assembly ............................ 40.031 0.007 mm

(1.5760 0.0003 inch)

Cylinder bore size ............. 110.03 mm (4.332 inch)

Piston pin bore diameter that is in the piston

skirt ..................................... 40.020 0.005 mm

Clearance ................................... 0.825 0.125 mm

(1.5756 0.0002 inch)

(0.0325 0.0049 inch)

Piston pin diameter ............ 40.000 0.005 mm

(1.5748 0.0002 inch)

The intermediate piston ring has an increase in

Length of piston pin ............... 89.95 0.15 mm

clearance for each 0.03 mm (.001 inch) increase

(3.541 0.006 inch)

in the cylinder liner bore.

Thoroughly lubricate the piston pin with clean

Increase ................................. 0.09 mm (0.004 inch)

engine oil prior to assembly.

Oil Control Ring

(5) The oil control piston ring has a spring that is

installed with the ring. The gap in the spring

should be a distance of 180 degrees from the

ring end gap when the oil control piston ring is

assembled. The light green colored portion of

the spring must be visible at the ring end gap.

Width of the groove in a new piston for the oil

control piston ring ...................... 4.041 0.013 mm

(0.1591 0.0005 inch)

Thickness of the new piston ring .. 3.985 0.010 mm

(0.1569 0.0004 inch)