Mercedes-Benz OM 668
The OM 668 is a four-cylinder - Diesel engine ( in-line engine ) from Mercedes-Benz , which in 1997 from A-Class and from 2001 in the Vaneo was built. The successor model is the OM 640 .
technology
The OM 668 has common rail injection . He is in contrast to the same time built gasoline engine M 166 in four-valve technology run (16V). The valve control of the two overhead camshafts takes place via a control chain (duplex roller chain ), which drives the inlet camshaft; from there, a spur gear drives the exhaust camshaft. Another (single) roller chain connects the crankshaft with the oil pump. All variants are equipped with engine charging and - with the exception of the 44 kW / 60 PS engines - intercoolers . The then smallest diesel engine from Mercedes has a displacement of 1689 cm³ (bore 80 mm × stroke 84 mm).
In both models, the transversely installed engine drives the front wheels ( front-wheel drive ). As with the Otto engine, power is transmitted via a five-speed manual gearbox or a five-speed automatic.
variants
Motor (s) | designation | power | Torque | model |
---|---|---|---|---|
OM 668 DE 17 A | 668.941 | 44 kW (60 PS) at 3600 rpm | 160 Nm at 1500-2400 rpm | A 160 CDI (until 2001) |
OM 668 DE 17 LA red. | 668.940 red. | 55 kW (75 PS) at 3600 rpm | 160 Nm at 1500-2800 rpm | A 160 CDI (from 2001) and Vaneo CDI |
OM 668 DE 17 LA | 668.940 | 66 kW (90 PS) at 4200 rpm | 180 Nm at 1600–3200 rpm | A 170 CDI (until 2001) and Vaneo 1.7 CDI |
OM 668 DE 17 LA | 668,942 | 70 kW (95 PS) at 4200 rpm | 180 Nm at 1600–3600 rpm | A 170 CDI (from 2001) |
M: engine, OM: oil engine, series: 3-digit, E: intake manifold injection, KE: port injection, DE: direct injection, ML: compressor, L: charge air cooling, A: exhaust gas turbocharger, red. : reduced performance / displacement, LS: performance increase
Mechanically, the engines are all the same, but the first A 160 CDI does not have a charge air cooler. For the facelift, only the camshaft and the turbocharger were revised, which is why the output increased slightly. The torque did not increase because the A 170 CDI was already throttled in terms of the weakly dimensioned clutch .
With this throttling, the power can be increased to around 88 kW (120 PS) and the torque to over 200 Nm with just a few interventions in the engine electronics ( chip tuning ). The engine's already long service life does not suffer from this; The A-Class clutch, which is considered weak, is exposed to very high loads.
Others
The aircraft engine manufacturer Thielert offers a version of the OM 668 adapted for aviation under the name Thielert Centurion 1.7 . This is the first new development of an aircraft engine for civil aviation since Porsche became involved .
swell
- A class manual (MOPF 2001)
- Technical data for the OM 668
- Information on the W 168 / OM 668 at Elchfans.de