ar0310t0001cb

Check piston and connecting rod for wear and damage

Type ar · topic 03.10 · version 0102 · 2009-01-13

Applies to: ENGINE 457.941 in MODEL NMB613.368 ENGINE 457.944 in MODEL NMB613.367

Where it sits

Function group 1 Engine › 03 Crank assembly › 03.10 Connecting rods, pistons — Series 613 (models 367, 368)

EinPAS 15 Engine › 15.15 Combustion engine, complete/engine housing/crank assembly › 15.15.40 Connecting rod/piston — Series 613 (models 367, 368)

Also applies to engines/gearboxes: 457 941, 457 944

AR03.10-T-0001CB

Check piston and connecting rod for wear and damage

11.12.08

ENGINE 457.941 in MODEL NMB613.368

ENGINE 457.944 in MODEL NMB613.367

Removing

1

Remove pistons

AR03.10-T-7021CB

Clean

2

Clean all parts to be checked and remove all residues

Particularly the grooves on the piston ring and the oil return bore holes in the piston.

Checking, measuring

3

Check piston crown and piston skirt by means of visual inspection for damage and wear

Replace piston if necessary. Piston must be replaced only together with the matching cylinder liner as a replacement part repair kit:

Remove/install/seal cylinder liner

AR01.40-T-9324BB

Notes on the assessment of pistons and piston rings

AH03.10-N-0001-04A

4

Check cylinder liner means of visual inspection for damage and wear

Replace cylinder liner if necessary. Replace cylinder liner only together with the matching piston as a replacement part repair kit:

Remove/install/seal cylinder liner

AR01.40-T-9324BB

Notes for evaluation of a cylinder barrel

AH01.40-N-0001-03A

5

Check cylinder liner through measurement for wear

Only if visual inspection carried out earlier gave rise to no complaints.

Cylinder liner inner dia.

*BE01.40-N-1001-03G

Quick calipers for internal measurements

Micrometer

Replace cylinder liner if necessary. Replace cylinder liner only together with the matching piston as a replacement part repair kit:

Remove/install/seal cylinder liner

AR01.40-T-9324BB

6

Check connecting rod and check connecting rod bearing bushing (connecting rod eye) by means of visual inspection for wear, damage or angular movement of the oil holes

Replace connecting rod if there is any wear, damage or twisting of the connecting rod bushing.

Notes on assessing wear on connecting rod bearing and connecting rod journal

AH03.10-N-0001-03A

7

Inspect connecting rod and connecting rod bearings

Only if visual inspection carried out earlier gave rise to no complaints.

AR03.10-T-6111BB

8

Measure shank length of connecting rod bolts

Replace connecting rod bolt if necessary.

*BE03.10-N-1002-01J

Vernier caliper

9

Measure diameter of piston pin bore and piston pin

*BE03.10-N-1003-02I

*BE03.10-N-1004-02I

Quick calipers for internal measurements

Micrometer

Install

10

Install pistons

AR03.10-T-7021CB

Check values for cylinder liner

Number

Designation

Engine
457.941/942

Engine
457.944

BE01.40-N-1001-03G

Cylinder liner inside Ø

Code letter A

mm

127.990 to 127.995

127.990 to 127.995

Code letter B

mm

127.995 to 128.005

127.995 to 128.005

Code letter C

mm

128.005 to 128.010

128.005 to 128.010

Test and adjustment values for pistons

Number

Designation

Engine
457.941/942

Engine
457.944

BE03.10-N-1003-02I

Piston pin bore

mm

52.004 to 52.012

52.004 to 52.012

BE03.10-N-1004-02I

Piston pin Ø

mm

51.995 to 51.998

51.995 to 51.998

Check values for connecting rod

Number

Designation

Engine
457.941/942/944/945/946

BE03.10-N-1002-01J

Connecting rod bolt

Thread Ø

M

161.5

Shank length (L) when new

mm

67.0 to 67.5

permissible shank length (L)

mm

68.5

Referenced documents