Engine specifications (Mercedes-Benz E-Class W124)

An SOHC engine is an engine with one overhead camshaft mounted in the cylinder head.

Engine code:
– 2.6 l engine	103.940
– 3.0 l engine	103.980 or 103.983
Working volume:
– 2.6 l engine	2597 cm³
– 3.0 l engine	2960 cm³
Cylinder diameter:
– 2.6 l engine	82.9 mm
– 3.0 l engine	88.5 mm
Piston stroke	80.2 mm
Direction of rotation of the engine crankshaft	Clockwise when viewed from the front of the vehicle
Location of cylinder #1	From the drive chain side
Cylinder firing order	1–5–3–6–2–4
Compression pressure:
– minimum allowable compression pressure	8.5 bar
– the maximum permissible difference between any two cylinders	1.5 bar
Compression ratio	9,2: 1

Camshaft

Axial clearance:
- nominal	0.030 – 0.110 mm
- maximum permissible	0.150 mm
Working clearance of camshaft bearings:
- nominal	0.040 – 0.082 mm
- maximum permissible	0.100 mm
Maximum permissible length of cylinder head mounting bolts	108.4 mm

Lubrication system

Pressure generated by the oil pump:
- at idle speed	0.3 bar
– at 3,000 rpm	3.0 bar

Flywheel/Drive Plate Mounting Bolts

Minimum diameter	8.0 mm
Maximum length	22.5 mm

Tightening moments

Cylinder head cover mounting bolts	15 Nm
Crankshaft Pulley/Vibration Damper Mounting Bolts	300 Nm
Radiator Fan Shroud Mounting Bolts	21 Nm
Bolt for fastening the distributor rotor drive to the camshaft:
- bolt M7	16 Nm
- bolt M8	21 Nm
Drive chain upper cover mounting bolts	21 Nm
Lower drive chain cover mounting bolts:
- bolt M6	9 Nm
- bolt M8	21 Nm
Bolt for fastening the auxiliary drive belt tensioner mechanism (M12)	75 Nm
Auxiliary Drive Belt Idler Pulley Mounting Bolts	30 Nm
Auxiliary drive belt tensioner pulley mounting bolt	30 Nm
Camshaft Sprocket Fastening Bolt	16 Nm
Chain tensioner housing cap nut	50 Nm
Threaded bushing for fastening the drive chain tensioning mechanism to the cover	30 Nm
Camshaft Bearing Cap Fastening Bolts	21 Nm
Cylinder head mounting bolts:
- stage 1	70 Nm
- stage 2	turn 90°
- stage 3	turn 90°
Gearbox to engine mounting bolts:
– manual transmission:
• bolts M10 x 40	55 Nm
• bolts M10 x 90	45 Nm
– automatic transmission:
• M10 bolts	55 Nm
• M12 bolts	65 Nm
Oil pan mounting bolts:
– M6 bolts	10 Nm
– M8 bolts	25 Nm
Oil drain plug	25 Nm
Oil pressure relief valve plug	50 Nm
Oil pump sprocket mounting bolt	32 Nm
Oil pump mounting bolts	25 Nm
Flywheel/Drive Plate Mounting Bolts:
– stage 1:
• standard flywheel	30 Nm
• flywheel with double mass	40 Nm
- stage 2	turn to an angle of 90 – 100°
Crankshaft rear cover mounting bolts	10 Nm
Engine mount bracket mounting bolts to engine	55 Nm
Crossmember to engine bracket mounting bolts	40 Nm
Engine mount mounting bolts	25 Nm
Connecting rod bearing cap fastening nuts:
- stage 1	30 Nm
- stage 2	turn to an angle of 90 – 100°
Main bearing cap mounting bolts:
- stage 1	55 Nm
- stage 2	turn to an angle of 90 – 100°
Coolant drain plug from the engine cylinder block	30 Nm