ar0140b9291d

Boring and honing cylinder bores

Type ar · topic 01.40 · version 0101 · 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-9291D

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

Represented on engine OM 364 and OM 366

1 Engine block

2 Cylinder (no liner)

a Chamfer in cylinder top edge

Removal

1

Remove the crankshaft.

AR03.20-B-4351C

Milling

2

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

3

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

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.

4

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

Diameter of cylinder bore, no liner (final finish).

*BE01.40-B-1021-02A

Broaching machine setting values:

Speed; 250 - 280/min. (rpm)

Tool feeding; 0.04 - 0.06 mm/turn.

5

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

To facilitate later piston installation

*BE01.40-B-1022-02A

6

Machine the engine block surface at the height corresponding to the degree of the cylinder diameter

The height of the cylinder block with no liner will have to satisfy the same degree of tolerance of the diameter of the cylinders (normal or repair I).

AR01.40-B-9133A

7

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

Diameter of cylinder bore, no liner (final finish).

*BE01.40-B-1021-02A

Max. out of round and taper.

*BE01.40-B-1007-02A

Surface finish of cylinder (roughness).

*BE01.40-B-1023-02A

Honing machine setting values:

Working pressure; 2.5 - 3.0 bar.

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

Honing angle; 40° - 60°.

Double stroke; 30 - 40/min.

8

Clean the engine block.

Installing

9

Install the crankshaft.

AR03.20-B-4351C

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

BE01.40-B-1021-02A

Cylinders diameters, final workmanship

Standard

Letter A

mm

97,485...97,491

97,485...97,491

Letter B

mm

97,492...97,508

97,492...97,508

Letter C

mm

97,509...97,515

97,509...97,515

Repair stage I

Letter A

mm

97,985...97,991

97,985...97,991

Letter B

mm

97,992...98,008

97,992...98,008

Letter C

mm

98,009...98,015

98,009...98,015

BE01.40-B-1022-02A

Sliding chamfer (a) to the piston

A1

mm

0,2...0,6

0,2...0,6

A2

degrees

30

30

BE01.40-B-1023-02A

Cylinder R3Z internal finishing roughness (with or without liner)

mm

0,003...0,005

0,003...0,005

Referenced documents