Measure cylinder bores · ar0140a9202a · Mercedes-Benz WIS

AR01.40-A-9202A

Measure cylinder bores

18.12.09

ENGINE 457.939 /945 /946 /949 in MODEL NAB372.124

ENGINE 457.939 /945 in MODEL NAB372.317

A01.40-0003-06

1 Cylinder liner

2  Dial indicator

3  Quick calipers for internal measurements

4  Micrometer

A Direction of travel

B Transverse direction

I Cylinder liner inner  in the area above upper reversal point of the first piston ring

II Cylinder liner inner  in the area of upper reversal point of the first piston ring

	Removing
1	Remove cylinder head		AR01.30-A-5800A
	Clean
2	Clean cylinder liners (1)
	Checking
3	Inspect cylinder liners (1)	 The cylinder liners (1) must not have any burn strips. Individual slight scores are not critical.
	Notes for assessing wear to cylinder wall in the case of dust damage		AH01.40-N-0001-01A
	Measure
4	Set dial indicator (2) and quick calipers for internal measurements (3) with outside micrometer (4) to cylinder liner inner 	 Pretension 5 mm	*BE01.40-N-1001-03G
			*001589532100
		Quick calipers for internal measurements
		Outside micrometer
5	Measure cylinder liner inner  in area above the top reversal point of the first piston ring (I) and set scale of dial gage to "0"	 Area free of wear. Carry out measurement in direction of travel (A) and in transverse direction (B).	*BE01.40-N-1001-03G
		Permissible out-of-roundness of cylinder liner	*BE01.40-N-1003-03G
			*001589532100
		Quick calipers for internal measurements
		If permissible values are not maintained the cylinder liner must be replaced: 
		Remove/install/seal cylinder liner	AR01.40-A-9324A
6	Measure cylinder liner inner  in the area of the top reversal point of the first piston ring (II)	 Area with maximum wear. Carry out measurement in direction of travel (A) and in transverse direction (B).	*BE01.40-N-1002-03G
		Permissible out-of-roundness of cylinder liner	*BE01.40-N-1003-03G
			*001589532100
		Quick calipers for internal measurements
		If permissible values are not maintained the cylinder liner must be replaced: 
		Remove/install/seal cylinder liner	AR01.40-A-9324A
	Install
7	Install cylinder head		AR01.30-A-5800A

Check values for cylinder liner

Number	Designation			Engine 457.939/949	Engine 457.945/946


BE01.40-N-1001-03G	Cylinder liner inside dia.	Code letter A	mm	127.990...127.995	127.990...127.995
		Code letter B	mm	127.995...128.005	127.995...128.005
		Code letter C	mm	128.005...128.010	128.005...128.010
BE01.40-N-1002-03G	Wear of cylinder liner	Top reversal point of first piston ring	mm	0.08	 0.08
BE01.40-N-1003-03G	Out-of-roundness of cylinder liner		mm	0.012	 0.012

Dial indicator

001 589 53 21 00

Referenced documents

ah0140n000101a Notes for assessing wear to cylinder wall in the case of dust damage
ar0130a5800a Remove/install cylinder head
ar0140a9324a Remove/install/seal cylinder liner