Usage, repair and maintenance specification of CAC gasoline engine
Remove main bearing bolt. Take out the main bearing cap
carefully. Arrange them according to the sequence. Read the
bearing clearance according to the proportion stated in the cover of
plastic clearance gauge. Check the bearing clearance from the third
main bearing and extending to the two sides. The clearance of
main bearing is 0.011—0.058m m.
——Check clearance of connecting rod bearing
Use the above method to check clearance of connecting rod
bearing.
Clearance of connecting rod bearing is 0.006—0.06mm.
——The size of connecting rod journal and connecting rod
bushing: unit:mm
——The size of main journal and main bearing half:
unit:mm
Level
The diameter of connecting
rod journalφ
The thickness of
connecting rod
bushing
standard
47.89—47.91 1.480—1.487
undersize 0.025
47.89—47.91 1.492—1.499
undersize 0.25 47.64—47.66 1.605—1.612
undersize 0.5 47.39—47.41 1.730—1.737
undersize 0.75 47.14—47.16 1.855—1.862
undersize 1.0 46.89—46.91 1.980—1.987
Level
The diameter.
of main
journal
The diameter of
main bearing bore
of cylinder body
The thickness
of main
bearing half
shell
Standard
57.98—58.00 62.2935±0.0065 2.131—2.138
oversize 0.4
57.98—58.00 62.6935±0.0065 2.331—2.338
undersize
0.002
57.98—58.00 62.2935±0.0065 2.141—2.148
undersize 0.25 57.73—57.75 62.2935±0.0065 2.256—2.263
undersize 0.50 57.48—57.50 62.2935±0.0065 2.381—2.388
undersize0.75 57.23—57.25 62.2935±0.0065 2.506—2.513
undersize 0.25
oversize 0.4
57.73—57.75 62.6935±0.0065 2.456—2.463
undersize 0.50
oversize 0.4
57.48—57.50 62.6935±0.0065 2.581—2.588
undersize 0.75
oversize 0.4
57.23—57.25 62.6935±0.0065 2.706—2.713
Fig. 67
Fig. 66
Fig.65
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