Reconditioning and Aligning Connecting Rod

Conventional Tool
Connecting rod testing and straightening device:
e.g. Walter Krupp GmbH D-5309 Meckenheim Model CL6

Specifications:

NOTE:
Connecting rods which were overheated as a result of bearing damage (blue discoloration) may not be re-used.
Connecting rod and connecting rod cap are marked together. The connecting rod shaft should not show any transverse score marks and nicks.
Connecting rods with machined connecting rod bushing are available as a spare part
Connecting rods and crankshafts with different contact collar diameters may be installed together during repairs.






1 Weight compensation
2 Oil hole
3 Locating grooves

When renewing connecting rods, pay attention to differences in weight of connecting rods.


Reconditioning:





1 Check connecting rod bolts and renew if required. Checking, Replacing and Tightening Conrod Bolts





2 Check bores for connecting rod bolts.
Place connecting rod bearing cap on one connecting rod bolt. If connecting rod bearing cap moves down by its own weigh, renew connecting rod.





3 Mount connecting rod bearing cap and tighten connecting rod nuts to 40 - 50 Nm.
4 Measure connecting rod bearing basic bores. If basic bore exceeds the specified value or is conical, touch up bearing cap mating surface on a surface plate up to a maximum of 0.02 mm.





5 Press in new connecting rod bushing so that the oil bores are in alignment. Pressing-in pressure at least 2500 N.
6 Machine or ream connecting rod bushing.
7 Touch up lateral connecting rod contact surfaces on a surface plate.
8 Square connecting rod with connecting rod tester.





9 Align connecting rod bore relative to connecting rod bushing bore (parallel alignment).





10 Check offset of connecting rod bearing bore relative to connecting rod bushing bore and correct if necessary.