Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
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g. Measure the cam height of the camshaft. The standard
value is 42.02±0.05mm and the limit is 41.65mm. If
the measurement is out of the limit, make sure to
replace the camshaft.
h. Use a multimeter to measure the outside diameter of
each camshaft journal. If any measurement is out of
the limit, replace the camshaft. The standard value for
outside diameter of journal is 49.945-49.975mm and
the limit is 49.60mm. If any measurement is out of the
limit, replace the camshaft.
i. Use a feeler gauge to measure the axial run-out
clearance of the camshaft. The axial run-out clearance
of camshaft is 0.05~0.114mm.
j. Use a multimeter to measure the outside diameter of
valve stem. If the measurement is less than the
specified limit, make sure to replace the valve and
valve guide in pair.
(Intake valve: 7.946-7.961mm; limit: 7.880mm)
(Exhaust valve: 7.921-7.936mm; limit: 7.850mm)
k. Use a multimeter to measure the inside diameter of
valve guide and subtract the outside diameter of valve
stem from the measurement to obtain the valve guide
clearance. If the clearance obtained is out of specified
limit, make sure to replace the valve and valve guide in
pair.
(Limit of intake valve guide clearance: 0.200mm)
(Limit of exhaust valve guide clearance: 0.250mm)
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