Chpter IV Mechanical System
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
141
Fig. 4 -2-11 Measuring the outer diameter of
the camshaft journal
Fig. 4 -2-12 Measuring the height of the cam
Fig. 4 -2-13 Measuring the radial runout of the
camshaft
the limitation.
Outer diameters of the camshaft journals
Standard
Intake camshaft
26.947
～
26.960 mm
Exhaust camshaft
26.947
～
26.960 mm
，
26.947
～
26.960 mm
2. Checking the height of the cam
Use a micrometer to measure the height of the cam
（
H
）
. See Fig. 4-2-12.
Replace the camshaft if any measured value is below
the limitation.
Heights of the cam
Standard
Intake camshaft
35.10
～
35.20 mm
Exhaust camshaft
33.58
～
33.68 mm
3. Checking the radial runout of the camshaft
Put the camshaft on a V-block.
Use a micrometer to measure the radial runout of the
camshaft. See Fig. 4-2-13.
Replace the camshaft if the measured value exceeds
the limitation.
Radial runout of the camshaft
Standard
Limitation
≤0.02 mm
0.10 mm
4. Measuring the camshaft bearing clearance
Use an inside micrometer to measure the inner
diameter of the camshaft bearing.
Inner diameters of the camshaft bearings
Standard
Intake camshaft
27.000
～
27.021 mm
Exhaust camshaft
30.000
～
30.021 mm
，
27.000
～
27.021 mm
