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ENGINE
71
CONNECTING ROD
Stage
Connecting Rod small end
Parent bore diameter (mm)
Bush Outside diameter (mm)
Standard
34H7
34.3 +/- 0.02
Standard 1
34.2H7
34.1 +/- 0.02
Max. permissible circularity and ovality of connecting rod small end
parent bore
0.005 mm
0.008 mm
Connecting rod small end bush inside dia. (to be finished after installa-
tion) (Piston pin oiled has thumb push fit in small end bush)
Ø 31.020 - Ø 31.033 mm
Max. Permissible out of parallelism (bend) between connecting rod
small end and big end parent bores measured at a distance of 100
mm from centre line of connecting rod big end.
0.06 mm
Centre to centre distance between connecting rod small end and big
end parent bores.
149
+ 0.03
mm
Maximum permissible twist of connecting rod
0.1 mm
Connecting rod big end parent bore dia.
Ø 53.69+0.019
Max. permissible taper and ovality of connecting rod big end parent
bore cylindericity
0.008 mm
0.01 mm
Stage
Connecting Rod small end and big end par-
ent bore dia.
Crank pin journal dia. With bearing
shell (mm)
Normal
50.008, 50.047
50 -0.005,-0.02
Normal 1
49.958, 49.997
49.90 -0.005, 0.02
Repair 1
49.758, 49.797
49.75 -0.005,-0.02
Repair 2
49.508, 49.547
49.5 -0.005,-0.02
Bearing shells to be selected such that clearance is maintained
as
0.011-0.065 mm
Pre tension of connecting rod big end bearing shells
0.060-0.090 mm
Max. permissible difference in weight of connecting rods in one
engine
± 3 gms
Connecting rod big end axial play
0.1 - 0.35 mm