Picture 46 Measure the parallelism of connecting rod big head and small head
(2)Check the surface of connecting rod bushing to see whether there is any gaffing、melting or
seizure, if there is gaffing or damage , please change the bushing.
3.5 Lube oil clearance between piston pin and connecting rod small head bushing
Measure the outside diameter of piston pin which connects with connecting rod bushing with
outside micrometer, measure inside diameter of connecting rod small head bushing with inside
diameter lever meter; account the lube oil clearance. If the measured valuve exceeds the
limitation value, please replace the piston pin and bushing.
Table 18 Fitting clearance between connecting rod bushing hole diameter and piston pin
diameter
4. Crankshaft
4.1 Lube oil clearance of crankshaft、connecting rod big head hole and main bearing hole
(1) Painting check of journal neck
Clean crankshaft, check whether there is crack by painting infiltrating or magnetic inspection. If
there is crack or severe damage, please replace the crankshaft.
(2) Measure diameter of crankshaft crank pin (connecting rod journal) with outside micrometer;
measure connecting rod big head hole diameter with inside lever meter, then account the lube
oil clearance. If the measured value exceeds the limitation value, please replace crankshaft or
connecting rod bushing. Refer to picture 47.
Table 19 Fitting clearance of connecting rod bushing aperture and crankshaft connecting rod
axial diameter.
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