Matching camshafts and mounting - RA05001042210X(05-2210)

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Timing in degrees crank angle (°CKA) at 2 mm valve lift

⁽¹⁾ and new timing chain

Camshaft code number ⁽²⁾

Inlet opens ATDC ⁽³⁾⁽⁵⁾

Inlet closes ABDC ⁽³⁾

Exhaust opens BBDC

Exhaust closes BTDC ⁽⁵⁾

21, 23 ⁽⁶⁾
43 ⁽⁷⁾) 45 ⁽⁸⁾
33 ⁽⁹⁾, (34 ⁽⁴⁾

36°

19, 24 ⁽⁶⁾
41 ⁽⁷⁾, 47 ⁽⁸⁾
35 ⁽⁹⁾, (36)⁽⁴⁾
57 ⁽¹⁰⁾

30°

13°

59 ⁽¹¹⁾ (60) ⁽⁴⁾

34°

57 (58)⁽⁴⁾
65 (66) ⁽⁴⁾

31°

14°

⁽¹⁾	Permissible difference: ± 2.0 °CKA.

⁽²⁾	Camshaft code number on 3rd camshaft bearing or stamped on camshaft flange from rear with paint.

⁽³⁾	Camshaft adjuster in "retarded" position.

⁽⁴⁾	Repair size camshaft with 0.5 mm larger bearing diameter.

⁽⁵⁾	These readings can be obtained at the vibration damper.

⁽⁶⁾	Shaft diameter 30 mm since 8/89 (only USA; Japan).

⁽⁷⁾	Modified cam shape with steel bucket tappet since 8/89.

⁽⁸⁾	Centre axial location since 11/89.

⁽⁹⁾	Modified cam shape since 2/90.

⁽¹⁰⁾	since 04/91

⁽¹¹⁾	since 03/91

TEST DATA

		When new
Camshaft bearing dia.	Standard size	29.947 - 29.960
Camshaft bearing dia.	Repair size	29.434 - 29.450
Camshaft bearing play	Radial	0.040 - 0.074
Camshaft bearing play	Axial	0.060 - 0.210

Camshaft axial mounting

Fig 1: Identifying Camshaft Axial Mountings

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

2a	Bottom thrust washer	104 051 01 73
2b	Top thrust washer	104 051 00 73
2c	Bottom thrust washer	120 051 00 73
A	Thrust washer at bearings 1 and 8 in bearing halves of cylinder head				Up to engine end no.
	Bottom thrust washer	104 051 01 73			104980 10 000060
	Front bearing cap	Inlet	104 051 13 03		104980 12 000053
	Front bearing cap	Exhaust	104 051 11 03		104981 10 000019
					104981 12 000074
B	Two thrust washers each at bearings 1 and 8 in the bearing halves of cylinder head and in the camshaft bearing caps			As of engine no.	Up to engine end no.
	Bottom thrust washer	104 051 01 73		104980 10 000061	104980 10 000718
	Top thrust washer	104 051 00 73		104980 12 000054	104980 12 003032
	Front bearing cap	Inlet	104 051 20 03	104981 10 000020	104981 10 000157
	Front bearing cap	Exhaust	104 051 18 03	104981 12 000075	104981 12 000915
C	Two thrust washers each at bearings 4 and 11 in bearing halves of cylinder head			As of engine no.	Up to engine end no.
	Thrust washer	120 051 00 73		104980 10 000719	104980 10 004091
	Front bearing cap	Inlet	104 051 13 03	104980 12 003033	104980 12 017952
	Front bearing cap	Exhaust	104 051 11 03	104981 10 000158	104981 10 000789
				104981 12 000916	104981 12 007762
D	Without thrust washers at bearings 4 and 11 in bearing halves of cylinder head			As of engine no.	Engine 104990
	Front bearing cap	Inlet	104 051 37 03	104980 10 004092
	Front bearing cap	Exhaust	104 051 35 03	104980 12 017953 104981 10 000790 104981 12 007763

DECISION TABLE

Camshaft axial mounting

Bucket tappet

A⁽¹⁾

B⁽²⁾

Carbide metal

Steel

Camshafts

Standard 21/19

-C⁽²⁾

D⁽³⁾

Repair 33/35

Camshafts

Standard 23/24, 43/41

C⁽³⁾

D⁽⁴⁾

Repair 33/35

Camshafts

Standard 45/47

D⁽⁴⁾

Repair 33/35

Camshafts

Standard 33/35, 57/59 ⁽⁵⁾

Repair 33/35⁽⁶⁾ 57/59 65

⁽¹⁾	May only be fitted with camshafts with code numbers 21/19.

⁽²⁾	May only be fitted with camshafts with code numbers 23/24.

⁽³⁾	Together with cylinder head 104 010 10 20

⁽⁴⁾	Together with cylinder head 104 010 21 20

⁽⁵⁾	As of engine 980 10/50, 20/60 005792 980 12/52, 22/62 025654 981 10/50, 20/60 001134 981 12/52, 22/62 010894

⁽⁶⁾	Up to engine 980 10/50, 20/60 005791 980 12/52, 22/62 025653 981 10/50, 20/60 001133 981 12/52, 22/62 010893

Note

Fig 2: Identifying Cylinder Head With Thrust Shoulder For Axial Mounting Of Camshafts At Front

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Engine 104.98 up to 11/90

Cylinder head with thrust shoulder for axial mounting of camshafts at front (arrows).

Fig 3: Identifying Cylinder Head Without Thrust Shoulder For Axial Mounting Of Camshafts At Front

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Engine 104.98 as of 11/90

Engine 104.99

Cylinder head without thrust shoulder for axial mounting of camshaft at front (arrows).