ZEST/BOLT

ENGINE 1.3L QUADRAJET (90PS)

ALLOCATION OF HALF-BEARINGS TO MAIN

JOURNALS:

Having defined the grade for each crankshaft bearing

(to which a specific diameter corresponds according

to the grade), it is necessary to select the pair of

bearings which are the same colour. This is designed

to guarantee the optimum operational clearances for

all the bearings.

Main journal grade

Diameter

Paint Mark

grade A (normal) 51.000 ~ 50.994 mm RED paint mark

grade B (normal), 50.994 ~ 50.988 mm BLUE paint mark

grade C (normal), 50.988 ~ 50.982 mm YELLOW paint mark

grade AM

(0.127 undersize) 50.873 ~ 50.867mm BROWN paint mark

grade BM

(0.127 undersize) 50.867 ~ 50.861mm, GREEN paint mark

grade CM

(0.127 undersize) 50.861 ~ 50.855mm BLACK paint mark

Minimum

Maximum

0.025 mm

0.052 mm

Lastly, we wish to point out that, generally, the

clearance between the main journal and the half-

bearing, obtained through the selection method

indicated above, should be within the following values:

This value can be measured, as a final check, using

the calibrated wire (plastic gage).

CLASSIFICATION OF CRANKPINS AND

ALLOCATION OF HALF-BEARINGS

The procedure described for the main journal half-

bearings should also be carried out for selecting the

crankpin half-bearings.

Crank pin grade

Diameter

Paint Mark

grade A (normal) 42.600 - 42.5914 mm RED paint mark

grade B (normal), 42.591 - 42.582 mm, BLUE paint mark

grade AM

(0.127 undersize) 42.473 - 42.464 mm BROWN paint mark

grade BM

(0.127 undersize) 42.464 - 42.455 mm GREEN paint mark

By way of example, if the alphabetical code identified

is the one indicated by reference 1 in the diagram,

i.e. - BBBB, this means that the four crankpins are all

Grade B (to which a specific diameter belongs) and

are therefore ready for the fitting of half-bearings with

a blue coloured paint mark on the edge.

The first letter on the left - B of the alphabetical code

is always related to the first timing side crankpin.

Refer to the instructions above for the pair of half-

bearings to be allocated to each bearing.