Specifications and repair dimensions of engines (Mercedes-Benz E-Class W124)

Cylinder head

Maximum non-flatness of the lower surface:
– 4-cylinder petrol engines:
• parallel to the axis	0.15 mm
• perpendicular to the axis	0.05 mm
– other engines:
• parallel to the axis	0.08 mm
• perpendicular to the axis	0 mm
Minimum permissible height of the cylinder head after mechanical processing:
– 4-cylinder petrol engines	97.8 mm
– 6-cylinder SOHC petrol engines	89.5 mm
– 6-cylinder DOHC petrol engines	135.5 mm
- diesel engines	142.4 mm
The magnitude of the swirl chamber protrusion on diesel engines	7.6 – 8.1 mm
Minimum valve protrusion beyond the lower plane of the cylinder head gasket when installing new valves and valve seats:
– 4-cylinder petrol engines:
• intake valves	1.7 mm
• exhaust valves	0.5 mm
– 6-cylinder SOHC petrol engines	2.6L engines	3.0L Engines
• intake valves	1.0 mm	1.3 mm
• exhaust valves	0.8 mm	1.4 mm
– 6-cylinder DOHC petrol engines	No data
– diesel engines:
• intake valves	0.1 – 0.5 mm
• exhaust valves	0.1 – 0.5 mm
Minimum valve protrusion beyond the lower plane of the cylinder head gasket when installing machined valve seats and lapped valves:
– 4-cylinder petrol engines:
• intake valves	2.6 mm
• exhaust valves	1.4 mm
– 6-cylinder SOHC petrol engines	2.6L engines	3.0L Engines
• intake valves	1.7 mm	2.0 mm
• exhaust valves	1.5 mm	2.1 mm
– 6-cylinder DOHC petrol engines	No data
– diesel engines:
• intake valves	0.7 mm
• exhaust valves	0.7 mm

Valves

Valve Plate Diameter:
4-cylinder petrol engines:
– intake valves:
• 2.0L engines	42.90 – 43.10 mm
• 2.3L engines	45.10 – 46.19 mm
- exhaust valves	38.90 – 39.10 mm
6-cylinder SOHC petrol engines:
– 2.6 l engines
• intake valves	40.0 mm
• exhaust valves	35.0 mm
– 3.0 l engines
• intake valves	43.0 mm
• exhaust valves	39.0 mm
6-cylinder DOHC petrol engines	No data
Diesel engines:
- intake valves	37.90 – 38.10 mm
- exhaust valves	34.90 – 35.10 mm
Valve stem diameter:
– 4-cylinder petrol engines and 6-cylinder SOHC petrol engines:
• intake valves	7.955 – 7.970 mm
• exhaust valves	8.938 – 8.960 mm
– 6-cylinder DOHC petrol engines	No data
– diesel engines:
• intake valves	7.955 – 7.970 mm
• exhaust valves	8.945 – 8.960 mm

Valve springs

Length of spring in free state:
4-cylinder petrol engines	49 mm
6-cylinder SOHC petrol engines	No data
6-cylinder DOHC petrol engines:
– with two springs:
• external spring	46.8 mm
• internal spring	47.6 mm
- with one spring	47.3 mm
Diesel engines:
– with yellow/green or purple/green color markings	50.8 mm
– with yellow/blue or purple/blue color markings	50.0 mm

Cylinder block

Cylinder diameter:
4-cylinder petrol engines:
– 2.0 l engines:
• standard 0	88.998 – 89.008 mm
• standard 1	89.009 – 89.018 mm
• standard 2	89.019 – 89.028 mm
• standard A	89,000 – 89,006 mm
• standard X	89.007 – 89.012 mm
• standard B	89.013 – 89.018 mm
• increased by +0.5 mm	Dimensions as above +0.500 mm
• increased by +1.0 mm	Dimensions as above +1,000 mm
– 2.3 l engines:
• standard 0	95.498 – 95.508 mm
• standard 1	95.509 – 95.518 mm
• standard 2	95.519 – 95.528 mm
• standard A	95,500 – 95,506 mm
• standard X	95.507 – 95.512 mm
• standard B	95.513 – 95.518 mm
• increased by +0.5 mm	Dimensions as above +0.500 mm
• increased by +1.0 mm	Dimensions as above +1,000 mm
6-cylinder SOHC petrol engines:
– 2.6 l engines:
• standard 0	82.898 – 82.908 mm
• standard 1	82.908 – 82.918 mm
• standard 2	82.918 – 82.928 mm
• standard A	82,900 – 82,906 mm
• standard X	82.906 – 82.912 mm
• standard B	82.912 – 82.918 mm
• increased by +0.5 mm	Dimensions as above +0.500 mm
• increased by +1.0 mm	Dimensions as above +1,000 mm
– 3.0 l engines:
• standard 0	88.948 – 88.508 mm
• standard 1	88.508 – 88.518 mm
• standard 2	88.518 – 88.528 mm
• standard A	88,500 – 88,506 mm
• standard X	88.506 – 88.512 mm
• standard B	88.512 – 88.518 mm
• increased by +0.5 mm	Dimensions as above +0.500 mm
• increased by +1.0 mm	Dimensions as above +1,000 mm
6-cylinder DOHC petrol engines:
– 3.0 l engines:
• standard A	88,500 – 88,506 mm
• standard X	88.506 – 88.512 mm
• standard B	88.512 – 88.518 mm
• increased by +0.5 mm	Dimensions as above +0.500 mm
• increased by +1.0 mm	Dimensions as above +1,000 mm
– 2.8 and 3.2 l engines:
• standard A	88,900 – 88,906 mm
• standard X	88.906 – 88.912 mm
• standard B	88.912 – 88.918 mm
• increased by +0.25 mm	Dimensions as above +0.250 mm
• increased by +0.5 mm	Dimensions as above +0.500 mm
– diesel engines:
• standard A	87,000 – 87,006 mm
• standard X	87.006 – 87.012 mm
• standard B	87.012 – 87.018 mm
• increased by +0.7 mm	Dimensions as above +0.700 mm
• maximum cylinder ovality:
- petrol engines	0.05 mm
- diesel engines	0.07 mm
Maximum cylinder taper:
- petrol engines	0.05 mm
- diesel engines	0.07 mm
Minimum height of engine block:
– 4-cylinder petrol engines	292.35 mm
– 6-cylinder petrol engines	281.95 mm
- diesel engines	299.62 mm
Maximum non-flatness of the upper plane of the engine cylinder block:
– 4-cylinder petrol engines	No data
– 6-cylinder petrol engines:
• parallel to the axis	0.100 mm
• perpendicular to the axis	0.05 mm
- diesel engines	0.03 mm

Pistons

Piston diameter:
4-cylinder petrol engines:
– 2.0 l engines:
• standard 0	88.968 – 88.982 mm
• standard 1	88.978 – 88.992 mm
• standard 2	88.988 – 89.002 mm
• standard A	88.973 – 88.979 mm
• standard X	88.978 – 88.986 mm
• standard B	88.985 – 88.991 mm
• increased by +0.5 mm	Dimensions as above +0.500 mm
• increased by +1.0 mm	Dimensions as above +1,000 mm
– 2.3 l engines:
• standard 0	95.469 – 95.481 mm
• standard 1	95.479 – 95.491 mm
• standard 2	95.489 – 95.501 mm
• standard A	95.473 – 95.479 mm
• standard X	95.478 – 95.486 mm
• standard B	95.485 – 95.491 mm
• increased by +0.5 mm	Dimensions as above +0.500 mm
• increased by +1.0 mm	Dimensions as above +1,000 mm
6-cylinder SOHC petrol engines:
– 2.6 l engines:
• standard 0	82.868 – 82.882 mm
• standard 1	82.878 – 82.892 mm
• standard 2	82.888 – 82.902 mm
• standard A	82.873 – 82.879 mm
• standard X	82.878 – 82.886 mm
• standard B	82.885 – 82.891 mm
• increased by +0.5 mm	Dimensions as above +0.500 mm
• increased by +1.0 mm	Dimensions as above +1,000 mm
– 3.0 l engines:
• standard 0	88.469 – 88.481 mm
• standard 1	88.479 – 88.491 mm
• standard 2	88.489 – 88.501 mm
• standard A	88.473 – 88.479 mm
• standard X	88.478 – 88.486 mm
• standard B	88.485 – 88.491 mm
• increased by +0.5 mm	Dimensions as above +0.500 mm
• increased by +1.0 mm	Dimensions as above +1,000 mm
6-cylinder DOHC petrol engines:
– 3.0 l engines:
• standard A	88.473 – 88.479 mm
• standard X	88.478 – 88.486 mm
• standard B	88.485 – 88.491mm
• increased by +0.5 mm	Dimensions as above +0.500 mm
• increased by +1.0 mm	Dimensions as above +1,000 mm
– 2.8 and 3.2 l engines:
• standard A	88.478 – 88.879 mm
• standard X	88.878 – 88.886 mm
• standard B	88.885 – 88.891 mm
• increased by +0.25 mm	Dimensions as above +0.250 mm
• increased by +0.5 mm	Dimensions as above +0.500 mm
Piston protrusion from the cylinder block of diesel engines:
- minimum	0.735 mm
- maximum	0.965 mm

Crankshaft

Axial clearance:
– 4-cylinder petrol engines	0.300 mm
– 6-cylinder SOHC petrol engines	0.100 – 0.240 mm
– 6-cylinder DOHC petrol engines	0.100 – 0.250 mm
- diesel engines	0.300 mm
Thickness of thrust half rings for adjusting the axial play of the crankshaft	2.15, 2.20, 2.25, 2.35, 2.40 mm
Crankshaft main journal diameters:
– 4-cylinder petrol engines:
• nominal blue	57.960 – 57.965 mm
• nominal yellow	57.955 – 57.960 mm
• nominal red	57.950 – 57.955 mm
• nominal 1 blue	57.945 – 57.950 mm
• nominal 1 yellow	57.940 – 57.945 mm
• nominal 1 red	57.935 – 57.940 mm
• reduced 1	57.705 – 57.715 mm
• reduced 2	57.455 – 57.465 mm
• reduced 3	57.205 – 57.215 mm
• reduced 4	56.955 – 56.965 mm
– 6-cylinder SOHC petrol engines	No data
– 6-cylinder DOHC petrol engines:
• nominal blue	57.960 – 57.965 mm
• nominal yellow	57.955 – 57.960 mm
• nominal red	57.950 – 57.955 mm
• nominal 1 white	57.945 – 57.950 mm
• nominal 1 violet	57.940 – 57.945 mm
• reduced 1	57.705 – 57.715 mm
• reduced 2	57.455 – 57.465 mm
• reduced 3	57.205 – 57.215 mm
• reduced 4	56.955 – 56.965 mm
– diesel engines:
• nominal	57.959 – 57.965 mm
• reduced 1	57,700 – 57,715 mm
• reduced 2	57.450 – 57.465 mm
• reduced 3	57,200 – 57,215 mm
• reduced 4	56.959 – 56.965 mm
Crankshaft journal diameters:
– 4-cylinder petrol engines:
• nominal	47.955 – 47.965 mm
• reduced 1	47.705 – 47.715 mm
• reduced 2	47.455 – 47.465 mm
• reduced 3	47.205 – 47.215 mm
• reduced 4	46.955 – 46.965 mm
– 6-cylinder DOHC petrol engines:
• nominal	47.955 – 47.965 mm
• nominal 1	47.945 – 47.955 mm
• reduced 1	47,700 – 47,715 mm
• reduced 2	47.450 – 47.465 mm
• reduced 3	47,200 – 47,215 mm
• reduced 4	46.950 – 46.955 mm
– diesel engines:
• nominal	47.950 – 47.965 mm
• reduced 1	47,700 – 47,715 mm
• reduced 2	47,450 – 47,650 mm
• reduced 3	47,200 – 47,215 mm
• reduced 4	46.950 – 46.965 mm
Main bearing working clearance:
– 4-cylinder petrol engines	0.070 mm
– 6-cylinder SOHC petrol engines	0.030 – 0.050 mm
– 6-cylinder DOHC petrol engines	0.030 – 0.045 mm
- diesel engines	0.080 mm
Operating clearance of connecting rod bearings:
– 4-cylinder petrol engines	0.070 mm
– 6-cylinder SOHC petrol engines	0.030 – 0.060 mm
– 6-cylinder DOHC petrol engines	0.020 – 0.050 mm
- diesel engines	0.080 mm

Piston rings

Piston ring gap:
– 4-cylinder petrol engines:
• more precisely, a compression ring	0.30 – 1.00 mm
• middle compression ring	0.25 – 0.80 mm
• oil scraper ring	0.25 – 0.80 mm
– 6-cylinder petrol engines:
• more precisely, a compression ring	0.15 – 0.50 mm
• middle compression ring	0.20 – 0.40 mm
• oil scraper ring	0.10 – 0.45 mm
– diesel engines:
• more precisely, a compression ring	0.09 – 0.20 mm
• middle compression ring	0.15 – 0.15 mm
• oil scraper ring	0.03 – 0.10 mm

(Full article available on the resource: MERCEDESMAN.ru)

Main bearing cap mounting bolts

Maximum length:
– 6-cylinder DOHC petrol engines	63.8 mm

Connecting rod bearing cap mounting bolts

Minimum diameter:
– 4-cylinder petrol engines	8.0 mm
Maximum length:
– all engines except 4-cylinder petrol engines	52.9 mm

Tightening moments

4-cylinder petrol engines	See technical specifications in chapter 3
6-cylinder SOHC petrol engines	See technical specifications in chapter 4
6-cylinder DOHC petrol engines	See technical specifications in chapter 5
Diesel engines	See technical specifications in chapter 6