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ENGINE 273 MPFI
131
ENGINE
Connecting Rod Big End Clearance
Check connecting rod big end parent bore dimension
If connecting rod big end parent bore is slightly more
than maximum permissible limits, it is possible to
reclaim connecting rod provided the wear is confined
only to connecting rod bearing cap. Connecting rod
bearing cap mating surface may be slightly faced.
Parent bore should then be finished on a connecting
rod boring machine.
Ensure that connecting rod big end and small end
axes are parallel to each other within specified limits.
Centre to centre distance between connecting rod
small end and big end is maintained within specified
limits.
If one or more connecting rods are to be replaced,
ensure that difference in weight of connecting rod in
one engine is within permissible limits.
Install new pair of connecting rod bearing shell ac-
cording to size of crank pin journal diameter, making
sure that securing lugs of bearing shells are properly
seated in grooves of connecting rod and its bearing
cap.
Install connecting rod bearing cap with bearing shell
on connecting rod.
Tighten connecting rod bearing cap mtg. nuts to
specified torque.
Measure connecting rod bearing bore.
If connecting rod big end parent bore dimension is
maintained within specified limits, proper bearing bore
dimension is automatically achieved.
Connecting rod bearing shells are precision finished
and should not be bored or scraped.