Connecting Rods - Kohler KD 477-2 Workshop Manual

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CHECKS AND OVERHAUL
20
21
22
- 22 -

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:
Engine
Ø Piston pin
KD 477-2 21,997
If it is necessary to replace a complete connecting rod with bushes
and bolts, make sure its weight is:
Engine
KD 477-2
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).
KD 477-2 Workshop Manual_cod. ED0053029370_1° ed_ rev. 00
Assy. clearance
mm
mm
÷ 22,002 0,023 ÷ 0,038
Weight
gr. 570 ± 10
Max wear
mm
0,070