NANO

128

ENGINE 273 MPFI

Piston :

When replacing the pistons or installing oversize

pistons, be sure that the piston-to-cylinder clearance

remains within specified range

PISTON TOBORECLEARANCE

0.035 to 0.05 mm

Piston-to-cylinder clearance is equal to the bore

diameter minus the piston diameter, which is to be

mean measured bymeasuring at the level of the piston

in the direction transverse to piston pin axis, as shown.

•

Remove piston rings from piston using ring

expander.

•

Remove the carbon deposits from the piston.

•

Clean the piston and piston rings thoroughly In

case the cylinder bore taper and ovality is within

specified limit, then same piston and piston rings

may be reused.

•

Examine the pistons for cracks, scoring, other

damages, ring groove wear, piston pin bore wear,

spring clip groove wear/damage etc.

•

In case of any one piston with any one of this

defect, complete piston set should be replaced.

NOTE

Max. permissible difference in weights of pistons

with pin of an engine : 3 gms.

Piston Pin Diameter in mm : 17

-0.005

Piston Pin Bore In Piston in mm : 17.002 to 17.007

PISTONDIAMETER

STANDARDVALUE OVERSIZE (0.25)

A 73.45 - 73.46 mm P1 73.70 - 73.71 mm

B 73.46 - 73.47 mm Q2 73.71 - 73.72 mm