NANO

ENGINE 273 MPFI

127

ENGINE

INSPECTION & REPAIR DATA

CYLINDER BLOCK:

•

Distortion of gasketed surface

By the samemethod that is prescribed for checking

the distortion of the gasketed surface of the cylinder

head, check the top face of the cylinder block for

distortion and, if the distortion is found to exceed

the limit, machine the face with a surface grinder.

DISTORTIONOF GASKETED SURFACE

STANDARDVALUE

LIMIT

0.02 mm

0.05 mm

CYLINDERBLOCKHEIGHT

242 mm

•

Cylinder bore

Clean the cylinder bore thoroughly. Check cylinder

bore diameter, taper and ovality. Using a cylinder

bore gauge, measure the diameter of each bore in

two directions, longitudinal and transverse, at three

places, top, middle and bottom, to obtain a total of

6 readings. On the basis of these readings taken

on each bore, determine whether the maximum

difference in diameter between any two bores

exceeds the limit. If the limit, stated below, is

exceeded or if the bore wall is badly scored or

burned, re-bore all cylinders to the next oversize

and use oversize pistons in engine reassembly.

If any one of the two cylinders has to be re-bored, re-

bore both the cylinders to the same next oversize.

This is necessary for the sake of uniformity and

balance.

BOREDIAMETER

STANDARDVALUE

WEAR LIMIT

A 73.495 to 73.505 mm 73.555 mm

B 73.505 to 73.515 mm

73.565 mm

C 73.515 to 73.525 mm

73.575 mm

REBORINGDIAMETEROF CYLINDER

STANDARDVALUE OVERSIZE (0.25)

A 73.495 - 73.505 mm P1 73.745 - 73.755 mm

B 73.505 - 73.515 mm Q2 73.755 - 73.765 mm