ar0140b9291a

Boring and honing cylinder bores

Type ar · topic 01.40 · version 0100 · 2016-02-12

Applies to: Cumbustion engine 372, 374, 376, 377, 386 with Vehicle 382.### #B, 382.### #D, 384.### #B, 384.### #D, 386.### #B, 386.### #D, 682.### #B, 682.### #D, 684.2## #B, 684.2## #D, 693.### #B, 693.### #D, 694.### #B, 694.### #D, 695.### #B, 695.### #D

Where it sits

Function group 1 Engine › 01 Complete engine, crankcase ventilation, cylinder head, crankcase › 01.40 Crankcase, timing case cover, end cover — Series 372 · Series 374 · Series 376 · Series 382 · Series 384 · Series 386 · Series 682 · Series 684 (models 2**) · Series 693 · Series 694 · Series 695

EinPAS 15 Engine › 15.15 Combustion engine, complete/engine housing/crank assembly › 15.15.31 Crankcase/oil separator/ventilation — Series 372 · Series 374 · Series 376 · Series 382 · Series 384 · Series 386 · Series 682 · Series 684 (models 2**) · Series 693 · Series 694 · Series 695

Also applies to engines/gearboxes: 377 ***

AR01.40-B-9291A

Boring and honing cylinder bores

12.02.16

Cumbustion engine 372, 374, 376, 377, 386 with Vehicle 382.### #B, 382.### #D, 384.### #B, 384.### #D, 386.### #B, 386.### #D, 682.### #B, 682.### #D, 684.2## #B, 684.2## #D, 693.### #B, 693.### #D, 694.### #B, 694.### #D, 695.### #B, 695.### #D

Boring and honing cylinder bores

B01.40-0017-06

1 Engine block

2 Cylinder liner

a Chamfer

Milling

1

Secure the engine block (1) in the broaching machine.

2

Center the cylinder liner (2) to be machined, in relation to the broaching machine.

In those cases when machining more than one cylinder, observe the working sequence, to prevent damage due to excessive heating: 4-cylinder engines; 2-4-1-3 and 6-cylinder engines; 1-3-5-2-4-6.

3

Adjust the tool and carry out the machining, in several steps, until attaining a diameter 0.05 mm smaller than the final diameter.

Cylinder inside diameter, with cylinder liner (final finish).

*BE01.40-B-1001-03A

Broaching machine setting values:

Speed; 250 - 280/min. (rpm)

Tool feeding; 0.04 - 0.06 mm/turn.

4

Machine the chamfer (a) on top edge of cylinder liner (2).

To facilitate later piston installation

*BE01.40-B-1006-03A

5

Hone the cylinder liner (2) until obtaining the desired diameter (final finish).

Cylinder inside diameter, with cylinder liner (final finish).

*BE01.40-B-1001-03A

Max. out of round and taper.

*BE01.40-B-1007-02A

Surface finish of cylinder liner (roughness).

*BE01.40-B-1005-03A

Honing machine setting values:

Working pressure; 2.5 - 3.0 bar.

Speed; 60 - 100/min. (rpm).

Honing angle; 40o- 60o.

Double stroke; 30 - 40/min.

6

Check for eventual deformations in adjacent cylinders (contiguous). If necessary hone.

Procedure required only when cylinder liner assembly is not carried out in all cylinders.

*BE01.40-B-1001-03A

The cylinder(s) adjacent to the cylinder(s) fitted with liner(s), may suffer deformation, due to the pressing the cylinder liner into the engine block.

*BE01.40-B-1007-02A

Inspection data of cylinder liner

Número

Denominação

Engine 372.9, 374.9, 376.9, 377.9, 386.9

BE01.40-B-1001-03A

Liner internal diameter - Final finishing

Normal

Letter A

mm

97.485...97.491

Letter B

mm

97.492...97.508

Letter C

mm

97.509...97.515

BE01.40-B-1005-03A

Liner final finishing roughness, R 3Z

mm

0.003...0.005

BE01.40-B-1006-03A

Sliding chamfer (a) for the piston

a1

mm

0.4...0.6

a2

Degrees

30

Inspection data of crankcase

Número

Denominação

Engine 374.9

Engine 372.9, 376.9, 377.9, 386.9

BE01.40-B-1007-02A

Cylinders out of round and taper

Final workmanship

mm

0,007

0,007

Used cylinders limit

mm

0,01

0,01