- 22 -
KD 477-2 Workshop Manual_cod. ED0053029370_
1° ed
_ rev.
00
X
20
21
22
21,997
÷
22,002 0,023
÷
0,038
0,070
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 rea-
dings 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
), re-
set connecting rod as follows:
Place connecting rod stem on checking bench and apply a cali-
brated pressure to the convex side of the stem (fig. 22).
CHECKS AND OVERHAUL
Connecting rods
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 wi-
thout a bush in between.
Assembly clearance between connecting rod small end and piston
pin in millimetres:
KD 477-2
KD 477-2
gr. 570
± 10
