Engine specifications (Mercedes-Benz E-Class W124)

A DOHC engine is an engine with two camshafts mounted in the cylinder head.

Engine code:
– 2.8 l engine	104,942
– 3.0 l engine	104,980
– 3.2 l engine	104,992
Working volume:
– 2.8 l engine	2799 cm³
– 3.0 l engine	2960 cm³
– 3.2 l engine	3199 cm³
Cylinder diameter:
– 2.8 l engine	89.9 mm
– 3.0 l engine	88.5 mm
– 3.2 l engine	89.9 mm
Piston stroke:
– 2.8 l engine	73.5 mm
– 3.0 l engine	80.2 mm
– 3.2 l engine	84.0 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 pressure	12.0 bar
– the maximum permissible difference between any two cylinders	1.5 bar
Compression ratio	10,0: 1

Camshaft

Axial clearance:
- nominal	0.060 – 0.210 mm
- maximum permissible	0.150 mm
Working clearance of camshaft bearings:
- nominal	0.040 – 0.074 mm
- maximum permissible	0.150 mm
Maximum permissible length of cylinder head mounting bolts	163.5 mm

Lubrication system

Minimum oil 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	9 Nm
Bolts securing the crankshaft pulley to the hub	32 Nm
Bolt for fastening the hub to the crankshaft:
- bolt with spring washers	4 Nm
– bolt with conical washer:
• stage 1	200 Nm
• stage 2	Turn to an angle of 90°
Radiator Fan Bracket Mounting Bolts	21 Nm
Drive chain upper cover mounting bolts	21 Nm
Lower drive chain cover mounting bolts:
– M6 bolts	9 Nm
– M8 bolts	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
Bolts for fastening the camshaft sprocket that controls the exhaust valves:
– hexagon head bolts	18 Nm
– socket head bolts T30	22 Nm
– socket head bolts T40 (install only new bolts):
• stage 1	20 Nm
• stage 2	Turn to an angle of 60°
Bolts for fastening the camshaft sprocket that controls the intake valves:
- T30 socket head bolts without washer	12 Nm
- T30 socket head cap screws with ribs without washer	22 Nm
– socket head bolts T40 (install only new bolts):
• stage 1	20 Nm
• stage 2	Turn to an angle of 60°
Bolt of the bearing of the camshaft controlling the intake valves:
- a regular bolt with a washer	7 Nm
- bolt with ribs:
• stage 1	7 Nm
• stage 2	Turn to an angle of 90°
Nut of the adjustment mechanism of the camshaft controlling the intake valves (M20)	65 Nm
Chain tensioner cap nut	40 Nm
Drive chain tensioner housing	80 Nm
Drive chain intermediate sprocket mounting bolt (3.0L engine)	35 Nm
Cylinder head cover mounting bolts	21 Nm
Cylinder head mounting bolts:
- stage 1	55 Nm
- stage 2	Turn to an angle of 90°
- stage 3	Turn to an angle of 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
Oil pickup tube mounting bolts	10 Nm
Flywheel/Drive Plate Mounting Bolts:
– stage 1:
• bolts with reduced diameter back	30 Nm
• regular bolts	40 Nm
- stage 2	Turn to an angle of 90°
Crankshaft rear cover mounting bolts	9 Nm
Powertrain support bracket mounting bolts	55 Nm
Bolts for fastening the powertrain supports to the crossmember	40 Nm
Connecting rod 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