CHERY A21 SERVICE MANUAL MECHANISM OF 2.0NALC ENGINE
34
5) Inspect the connecting rod journal and
connecting rod bearing
a. Examine the diameter of connecting rod
journal.
Measure the axle diameter of connecting rod
with micrometer caliper.
Rotate the crankshaft 90° and measure it
again.
Work out the Roundness and cylindricity
through twice measuring.
① Roundness=Max. diameter — Min.
diameter /2 as the picture, take the
vertical diameters on the same plane,
subtract the half of Minimum from the
Maximum to get roundness.
② cylindricity= Maximum bore －
Minimum bore/2 As the picture,
measure the bores of 3 planes along
both A direction and B direction
respectively. Get the maximum and the
minimum from 6 values, and then
subtract the half of Minimum from the
Maximum to get cylindricity;
b. Inspect the radial clearance of
connecting rod bearing
Inspect the radial clearance of connecting rod
bearing with clearance gauge. Clean up the
connecting rod journal and connecting rod
bearing. And put clearance gauge on the
journal, fasten bearing bushing and fasten the
bolt according to set torque.
Note: Do not rotate the crankshaft during the
process.
Standard Value
Diameter
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