Chpter IV Mechanical System
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
163
Fig. 4-4-17 Measuring the radial runout of the
crankshaft
Fig. 4-4-18 Measuring the un-uniform wear of
the crankshaft
Fig. 4-4-19 Checking the crankshaft
Standard
0.020~0.045 mm
3. Checking the radial runout of the
crankshaft
(1) Carefully place the crankshaft on the V-block (See
Fig. 4-4-17).Slowly rotate the crankshaft and measure
the radial runout. If the value exceeds the limit value,
replace the crankshaft.
Crankshaft radial runout value
Standard
0.05~0.20 mm
(2) Measure the diameters of the crankshaft main
bearing journal and the crank pin and check them for
non-uniform wear. See Fig. 4-4-18.Replace the
crankshaft if the non-uniform wear of the crankshaft
exceeds the specified limitation.
Limitation
Main bearing journal
diameter
60.002~60.020 mm
Crank pin diameter
50.008~50.026 mm
Limitation for non-uniform
wear
0.050 mm or less
4. Checking the crankshaft
(1) Check the surface of the crankshaft main bearing
journal and the crank pin for excessive wear and
damage. See Fig. 4-4-19.
(2) Check the fitting surface of the crankshaft oil seals
for excessive wear and damage.
(3) Check the oil holes of the crankshaft for blocking.
5. Selecting the bearing shell of the
crankshaft
