Ruggerini Ry100, Руководство по ремонту

Страница: 15 / 36

15.0
service
00497R0990 - 15-07-2000
9.6 Piston rings - Piston - Pin
To gauge the wear on the piston rings, put them into the
cylinder from the bottom side and measure the distance
between the free ends (fig. 17), which must be:
Piston ring Piston ring Piston ring Piston ring Piston ring Assembly mm Assembly mm Assembly mm Assembly mm Assembly mm Wear limit mm Wear limit mm Wear limit mm Wear limit mm Wear limit mm
Compression 0.30
to
0.50 0.80
Oil scraper 0.25
to
0.50 0.80
Make sure that the piston rings slide smoothly in the slots and
use a thickness gauge to check the play between the slot and
ring (fig. 18). Replace the piston and rings if the play exceeds:
Piston ring Piston ring Piston ring Piston ring Piston ring Limite di usura mm Limite di usura mm Limite di usura mm Limite di usura mm Limite di usura mm
1st Compression A = 0.22
2nd Compression B = 0.19
3rd Oil scraper C = 0.16
WARNING: WARNING: WARNING: WARNING: WARNING: it is advisable to replace the piston rings whenever
the piston is demounted.
Checking the piston diameter:
the diameter of the piston must be measured at a distance
from the base (fig. 19) of approximately:
10 mm (for RY85.0 - RY85.1 - RY100 - RY101 series engines
11 mm (for RY120 - RY121) series engines
20
19
18
AAAAA
BBBBB
CCCCC
1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 m m m m m m m m m m
- 0.02 - 0.02 - 0.02 - 0.02 - 0.02 + + + + +
0 . 0 2 0 . 0 2
0 . 0 2 0 . 0 2 0 . 0 2
- 0.02 - 0.02 - 0.02 - 0.02 - 0.02
0 0
0 0
0
+ + + + +
0 . 0 2 0 . 0 2
0 . 0 2 0 . 0 2 0 . 0 2
0 0
0 0
0
+ + + + + - - - - -
+ + + + +
- -
- - -
9.7 Connecting rod
Coupling between the small end hole of the connecting rod
and pin is made without a bearing.
Play between connecting rod small end and pin mm:
Check connecting rod axes parallelism in the following
way:
1) Insert the pin into the small end hole of the connecting rod
and a calibrated plug into the big end (with the bearing
mounted).
2) Rest the plug on two prisms arranged on a surface plate or
between two centers (fig. 20).
3) Use a centesimal comparator to check that the difference
between the readings made at the ends of the pin does not
exceed 0.02 mm
0.02 mm 0.02 mm 0.02 mm 0.02 mm. square up the connecting rod if the
deformation is greater (max. 0.05 mm) (max. 0.05 mm) (max. 0.05 mm) (max. 0.05 mm) (max. 0.05 mm).
Pin Ø mm Pin Ø mm
Pin Ø mm Pin Ø mm
Pin Ø mm Play mm Play mm
Play mm Play mm
Play mm Wear limit mm Wear limit mm
Wear limit mm Wear limit mm
Wear limit mm
21.997
to
22.002 0.003
to
0.013 0.040
Check the play between cylinder and piston. Replace the
parts if play exceeds 0.150 mm.
Play between pin and piston mm:
Engine Engine Engine Engine Engine Diameter mm Diameter mm Diameter mm Diameter mm Diameter mm
RY85.0 - RY85.1 79.915
to
79.935
RY100 - RY101 84.915
to
84.935
RY120 - RY121 86.915
to
86.935
Pin Ø mm Pin Ø mm Pin Ø mm Pin Ø mm Pin Ø mm Play mm Play mm Play mm Play mm Play mm Wear limit mm Wear limit mm Wear limit mm Wear limit mm Wear limit mm
21.997
to
22.002 0.023
to
0.038 0.070
17