Ruggerini RY 50 - Connecting Rod and Crankshaft Service

36
17-04-2003
01
15-01-2004
DATE
COMPILER TECO/ATI
REG. CODE
1-5302-584
MODEL N°
50871
DATE OF ISSUE
REVISION
ENDORSED
52
51
VIII
53
54
05YR07YR57YR011-301YR
A
30,001÷079,9930,011÷079,90130,011÷79,90130,521÷79,421
B
020,02÷010,02020,02÷010,02020,22÷010,22020,32÷010,32
D
000,02÷599,91000,02÷599,91000,22÷599,12000,32÷599,22
)D-B(
520,0÷010,0520,0÷010,0520,0÷010,0520,0÷010,0
)D-B( .mil
50,050,050,050,0
DISASSEMBLY/REASSEMBLY
When remounting the big-end bearings, remember to
thoroughly clean the parts and generously lubricate them to
prevent seizure when the engine is started up for the first
time
Connecting rod
Demount the connecting rod and proceed with the following
inspections.
The big-end cap and big-end bear the same numbers.
When remounting, mount the cap from the same side as in C of the
figure.
Tighten the RY 50 bolts to a 23 Nm torque value.
Tighten the bolts to a 30 Nm torque value for RY 70-75-103-110.
Connecting rod, piston pin
Note: The connecting rod has no insert bearings. See fig. 62 for
connecting rod big end diameter.
Connecting rod alignement
Use a dial gauge as shown in the figure.
Check that axes are aligned using the piston pin; axial
misalignment A = 0.015; limit 0.03 mm.
Crankshaft end play
Secure the engine to a metal base or table. Use a dial indicator with
column and magnetic base plate. Place the stylus on the crankshaft.
Move the driving shaft back and forth on the flywheel side.
End play should be 0.05 - 0.25 mm; it is not adjustable.