22
COMPILER TECO/ATI ENDORSEDDATE
01.08.2003
REG. CODE
1-5302-620
MODEL N°
50902
DATE OF ISSUE
08-03
REVISION 00
X
20
21
22
21,997 ÷ 22,002 0,023 ÷ 0,038 0,070
RD210 RD 211 gr. 570 ± 10
RD270 RD278 gr. 760 ± 10
RD210-211
24,995 ÷ 25,000 0,010÷ 0,025 0,070
RD270-278
44,994 ÷ 45,010 0,03 ÷ 0,08
Engine
Ø Piston pin
mm
Assy.clearance
mm
Max wear
mm
Engine Weight
If it is necessary to replace a complete connecting rod with bushes
and bolts, make sure its weight is:
Check parallelism between connecting rod axies (fig. 21) as
follows:
1.Insert the gudgeon pin into the small end bush and a calibrated
pin into the big end (with bearing fitted).
2.Place the ends of the pin on 2 prisms set out on a checking
bench.
3.Check with a comparator gauge that the discrepancy in the
readings at the two ends of the gudgeon pin is not more than
0.05 mm. Should the distortion exceed this value (max 0.10
mm), reset connecting rod as follows:
Place connecting rod stem on checking bench and apply a
calibrated pressure to the convex side of the stem (fig. 22).
CHECKS AND OVERHAUL
Engine
Ø Piston pin
mm
Assy.clearance
mm
Max wear
mm
Connecting rods
RD 210-211 in steel
On the small end there is a groove (A, fig. 20) for the lubrication of
the gudgeon pin. The small end and the gudgeon pin are coupled
without a bush in between. Assembly clearance between
connecting rod small end and piston pin in millimetres:
Connecting rods RD 270-278
On the stem of the connecting rod there is a groove which runs
longitudinally from the big end to the small end for the lubrication of
the gudgeon pin (B, fig. 20).
Using a metallic point, make sure this passage is not obstructed
and that its diameter is 4.5 mm.
The small end bush is segmented and requires boring according to
the diameter of the gudgeon pin. When boring, keep a coupling
clearance between bush and gudgeon pin of:
Provision is made to fit a bush, (sizes indicated in table) on the big
end.
Ø journal
mm
Assy.clearance
mm
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