Measure cylinder bores

AR01.40-W-9202A

Measure cylinder bores

19.5.09



Remove/install

1

Remove cylinder head

Model 374, 375, 673, 674, 676, 950, 952, 953, 954, 958, 970, 972, 974, 975, 976

Model 957 without code (MS8) Natural gas engine

AR01.30-W-5800A

Model 668, 670

AR01.30-D-5800D

Model 957 with code (MS8) Natural gas engine

AR01.30-W-5800H

2

Attach cranking device for engine and set the piston to be measured to position BDC

AR03.30-W-1600-03A



*BA01.60-N-1002-01A



*904589046300



Measure

3

Clean cylinder barrel in crankcase (1) or in the cylinder liner

4

Check cylinder barrel in crankcase (1) or in the cylinder liner

 The cylinder barrel must not reveal any scorch streaks. Individual slight scores are not critical.



Notes for evaluation of a cylinder barrel

AH01.40-N-0001-03A

5

Set dial indicator (2) and quick-calipers for internal measurements (3) with micrometer to diameter of the cylinder barrel in crankcase (1) or in cylinder liner

 Pretension 5 mm.

Cylinder wall or cylinder liner inner dia.

*BE01.40-N-1001-02B



*001589532100

6

Measure diameter of cylinder barrel in crankcase (1) or in cylinder liner and set dial indicator (2) to "0"

 Measure in unworn area (top land zone) above top reversal point of the first piston ring. Direction of measurement in direction of travel (A) and in transverse direction (B).

Cylinder wall or cylinder liner inner dia.

*BE01.40-N-1001-02B

Variation of cylinder wall of cylinder shape

*BE01.40-N-1002-02B

7

Measure diameter difference of cylinder barrel in crankcase (1) or in cylinder liner

 The specifications must be maintained. The installed cylinder liner must not be reworked.

Measure wear of cylinder barrel at measuring point at top reversal point of the first piston ring (I), measuring point in the middle of the cylinder barrel (II), measuring direction in direction of travel (A) and measuring direction in transverse direction (B).

*BE01.40-N-1003-02B

Variation of cylinder wall of cylinder shape

*BE01.40-N-1002-02B

In the case of deviations from the tolerance, establish the repair method:



Engine 904.9, 906.9 with cylinder liner

Replace cylinder liner.

AR01.40-W-9273A

Engine 902.9, 904.9, 906.9 without cylinder liner

Machine crankcase (1) and install appropriate piston.

 No instructions were created for this repair method.

8

Install in the reverse order

Number

Designation

Engine
902.9
with code MS8,
Engine
906.9
with code MS8

Engine
904.9

Engine
906.9
without code MS8

BE01.40-N-1001-02B

Cylinder internal bore dia.

Code letter A

mm

105.985...105.991

101.985...101.991

Code letter B

mm

105.992...106.008

101.992...102.008

Code letter C

mm

106.009 ...106.015

102.009 ...102.015

BE01.40-N-1002-02B

Deviation of cylinder bore from the cylindrical form

mm

0.012

0.012

BE01.40-N-1003-02B

Wear on cylinder bore at top reversal point of first piston ring

measured in the driving or transverse direction

mm

0.1

0.1

Number

Designation

Engine
900.9, 902.9, 904.9, 906.9

BA01.60-N-1002-01A

Inspection hole closure cover to timing case

Nm

25