NANO

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.