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ENGINE
137
Inspection :
Connecting Rods :
1. Inspect connecting rod small end bush and if
necessary, replace it.
2. Check connecting rod small end parent bore
dimension.
3. If necessary machine connecting rod small
end parent bore to next over size.
4. Ensure that connecting rod big end and small
end axis are parallel to each other and are
within specified limits.
5. Ensure that the centre distance between
small end to big end is maintained within
specified limit.
6. Smear oil on parent bore of connecting rod.
NOTE
If required machine the side faces of bush
to match the taper faces of connecting rod.
7. Finish connecting rod small end bush bore on
a connecting rod boring machine.
8. Alternately connecting rod small end bush
may be reamed. The end edges to be
chamfered / deburred manually.
9. Install connecting rod bearing caps without
bearing shells on connecting rod.
10. Tighten connecting rod bearing cap mounting
nuts to specified torque.
11. Ensure that identification numbers for
connecting rod and connecting rod bearing
cap are matched and notches for bearing
shells are on the same side.
12. Check twist and bend of connecting rod by
using new piston pin in connecting rod small
end bush.
13. Measure twist and bend of connecting rod
with feeler gauge with respect to vertical face
of the connecting rod alignment gauge in
vertical and horizontal plane at a distance of
50 mm from line joining centers of connecting
rod small end and big end bosses.
14. Check connecting rod big end parent bore
dimension.
15. If connecting rod big end parent bore is
slightly more than maximum permissible
limits, it is possible to reclaim the connecting
rod provided the wear is confined only to
connecting rod bearing cap. In such cases the
connecting rod bearing cap mating surface
can be slightly faced. The parent bore should