Daewoo ST Series Instruções de Operação descarregar pdf (Página 81)

6.2.9. Piston rings

1) Visual check

Replace the piston rings with new ones if detected worn or broken when the engine is

overhauled.

2) Piston ring gap

•

Insert the piston ring into the upper portion of the cylinder liner bore and then it should be

positioned at a right angle against the cylinder liner wall surface.

•

Measure the piston ring gap with a

feeler gauge.

Replace piston rings with new ones if

the gap is beyond the limit

3) Piston ring side clearance

•

Fit the compression rings and oil ring

in the piston ring grooves.

•

With a feeler gauge, measure side

clearance of each ring, and replace

either the ring or piston if the

measured value is beyond the

specified limit.

4) Piston ring tension

With a tension tester, measure piston ring tension. Replace the piston ring if the measured

value is beyond the limit.

- 78 -

EA0M4032

Feeler gauge

Standard Limit

Top ring 0.40 ~ 0.65 mm 1.5 mm

2nd ring 0.40 ~ 0.65 mm 1.5 mm

Oil ring 0.30 ~ 0.60 mm 1.5 mm

Standard Limit

Top ring Tapered Type

2nd ring 0.07 ~ 0.102 mm 0.15 mm

Oil ring 0.05 ~ 0.085 mm 0.15 mm

Standard

Top ring 2.58 ~ 3.88 kg

2nd ring 1.81 ~ 2.71 kg

Oil ring 3.57 ~ 5.03 kg

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Daewoo ST Series Instruções de Operação Página 81