Chery A21 2005 Service Manual page 423

CHERY A21 SERVICE MANUAL
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 —
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=
Minimum
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;
Diameter
Roundness
Cylindricity
b. Inspect
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.
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Maximum bore
bore/2 As the picture,
Standard Value
0
47 9 .
−
. 0 016
——
——
the radial clearance
MECHANISM OF 2.0NALC ENGINE
Min.
－
of
34
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