Page 428 - Foton Workshop Manual - Aumark (BJ1099)

12B-138 ENGINE MECHANICAL - CRANKSHAFT AND FLYWHEEL

4. Check the diameter of the crankshaft
connecting rod neck
(a). Measure the diameter of each connecting
rod neck with the spiral micrometer.
The diameter of the connecting rod neck
is:47.981~48.000mm
• If the value is beyond the standard value,
the oil film clearance should be checked,
grind or replace the crankshaft when
necessary.
5. Check the ovality of the crankshaft
connecting rod neck
(a). The result of the substraction of the
measurement value in the two directions is
the ovality of the connecting rod neck, and
if the ovality is greater than the maximum
value, the crankshaft should be replaced.
Maximum ovality: 0.02mm

6. Check the oil film clearance of the
crankshaft
(a). Clean the crankshaft journal and all the
crankshaft bearings, and remove the oil
film on the crankshaft journal surface and
inside the bearing surface.
(b). Install the crankshaft.
(c). Cut plastic clearance gauge materials with
the same width of the bearing, and place
them on each shaft journal respectively,
and ensure that they are parallel with the
journal.
NOTICE:
When placing the plastic gauge materials, do not
turn the crankshaft.

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