Reconditioning, aligning and mounting conrod in bearings

Transcription

1 03-33 Reconditioning, aligning and mounting conrod in bearings Operation No. of operation texts and operation values or standard texts and flat rates 03-6 P Marking 6 Upper conrod bearing shell 3 Bottom balancing weight 7 Lower conrod bearing shell 4 M9 conrod bolt 8 Bearing shell locating lugs 5 Dowel sleeve Arrow Direction of travel Data Center of conrod bearing bore to center of conrod bush bore (L) ) Width of conrod at conrod bearing bore (B) Width of conrod at conrod bush bore (b) Conrod basic bore (D) ) Conrod bush basic bore (d) Conrod bush inner (d) Piston pin clearance in conrod bush Inner peak-to-valley height of conrod bush Permissible axial twist of conrod bearing bore 0.5 to conrod bush bore Permissible variation of axial parallelism of 0.07 conrod bearing bore to conrod bush bore Copyright Daimler AG /20/0 G/0/08. This WIS printout will not be recorded by the update service. Page

2 Permissible variation in concentricity of 0.0 conrod bearing bore Permissible difference in weight of complete conrod within an engine ) Engines g Crankshaft machining dimensions Crankshaft Size Color code Machining dimensions ) Conrod bearing journal Standard none at crankshaft Standard orange Standard 2 blue st repair size nd repair size rd repair size th repair size Conrod bearing journal Standard width Repair sizes to ) The crankshaft should be machined so that the specified bearing play is maintained with the existing bearing shells. Test data Conrod bearing play radial Conrod bearing shells axial Piston guided Color code red yellow blue Wall thickness in mm Standard Standard ) Standard 2 ) st repair size nd repair size rd repair size th repair size ) Standard and standard 2 wall thicknesses are not supplied as replacement parts. Copyright Daimler AG /20/0 G/0/08. This WIS printout will not be recorded by the update service. Page 2

3 Special tools Commercially available tools Conrod inspection tool e. g. Model BC 50 KWT D-6328 Dietzenbach Conrod aligning tool e. g. Model BC 503 KWT Quick-calipers for internal measurements mm mm Micrometer screw 0-25 mm mm Notes Conrod and conrod caps are marked together (arrow). Conrods which have been overheated as a result of bearing damage (blue discoloration), must not be re-used. The conrod shaft must not have any cross scores and notches. D-6328 Dietzenbach Conrods are supplied as replacement parts with a machined small end bush. P The conrod and the conrod cap are fixed to each other with dowel sleeves. Pay attention to difference in weight of conrods when replacing. Copyright Daimler AG /20/0 G/0/08. This WIS printout will not be recorded by the update service. Page 3

4 The end play of the conrod is limited at the piston pin bosses (piston-guided conrod, arrows). Reconditioning P Check conrod bolts, replace if necessary (03-30). 2 Fit on conrod bearing cap, oil thread and head contact surface of bolt and tighten to 20 Nm. 3 Measure conrod bearing basic bore. If the basic bore exceeds 5.69 mm or is conical, dress contact face of bearing cap on a dressing plate to max mm. Machine conrod cap together with conrod. P Copyright Daimler AG /20/0 G/0/08. This WIS printout will not be recorded by the update service. Page 4

5 4 Press in new small end bush so that the oil bores are aligned (arrows). Insertion pressure 2500 N. 5 Hollow out small end bush by turning or reaming. 6 Dress side contact surfaces of conrod on the dressing plate. P Aligning 7 Check angles of conrod with conrod inspection tool with bearing shells and piston pins installed. 8 Align conrod with a conrod aligning tool. 9 Align the parallelism of the conrod bearing bore to the conrod bush bore. P Copyright Daimler AG /20/0 G/0/08. This WIS printout will not be recorded by the update service. Page 5

6 0 Align the axial twist of the conrod bearing bore to the conrod bush bore. P Mounting in bearings Measure conrod basic bore and note. P Measure conrod bearing journal and note. 3 Calculate radial conrod bearing play. 4 Match up conrod bearing shell. 5 Mount conrod on pistons (03-36). P Copyright Daimler AG /20/0 G/0/08. This WIS printout will not be recorded by the update service. Page 6