Mercedes M273 engine
The Mercedes-Benz M273 engine is a V8 gasoline engine that was first introduced in 2005 as an evolution engine M113.
The M273 engine has an aluminum cylinder block with cast Silitec sleeves (Al-Si alloy), aluminum crankcase, forged steel crankshaft, forged connecting rods, sequential fuel injection, Bosch ME9 engine management, aluminum cylinder heads, double overhead camshafts, chain drive , four valves per cylinder, variable intake manifold made of aluminum-magnesium alloy, switchable intake flaps. The M273 engine was replaced by the Mercedes-Benz M278 engine in 2010.
Specifications M273
Below are the technical specifications for the most popular M273 55 motor.
| Engine displacement, cc | 5461 |
| Maximum power, hp | 382 – 388 |
| Maximum torque, N * m (kg * m) at rpm. | 530 (54) to 2800 530 (54) to 4800 |
| Fuel used | Petrol Gasoline AI-95 Gasoline AI-91 |
| Fuel consumption, l / 100 km | 11.9 – 14.7 |
| engine's type | V-shaped, 8-cylinder |
| Add. engine information | DOHC |
| Maximum power, h.p. (kW) at rpm | 382 (281) to 6000 387 (285) to 6000 388 (285) to 6000 |
| Compression ratio | 10.7 |
| Cylinder diameter, mm | 98 |
| The piston stroke, mm | 90.5 |
| CO2 emission in g / km | 272 – 322 |
| Number of valves per cylinder | 4 |
Modifications
| Modification | Volume | Power | Момент | Installed | Year |
|---|---|---|---|---|---|
| M273 46 KE | 4663 | 340 hp at 6000 rpm | 460 Nm at 2700-5000 rpm | X164GL450 | 2006-12 |
| W221S 450 | 2006-10 | ||||
| M273 55 KE | 5461 | 387 hp at 6000 rpm | 530 Nm at 2800-4800 rpm | W164 ML 500 | 2007-11 |
| X164GL500 | 2006-12 | ||||
| A207 and 500, C207 and 500 | 2009-11 | ||||
| A209 CLK 500, C209 CLK 500 | 2006-10 | ||||
| W211 and 500 | 2006-09 | ||||
| W212 and 500 | 2009-11 | ||||
| C219 CLS 500 | 2006-10 | ||||
| W221S 500 | 2005-11 | ||||
| R230 SL 500 | 2006-11 | ||||
| W251 R 500 | 2007-13 | ||||
| W463G500 | 2008-15 |
M273 engine problems
One of the main and popular problems of the M273 is wear of the drive gear of the timing chain, which leads to a violation of the position of the camshafts in the right head (for engines manufactured before September 2006). How to identify the problem: The check engine lamp, Diagnostic Trouble Codes (DTCs) 1200 or 1208 are stored in the ME-SFI control unit.
Cars built from September 2006 have a harder metal gear.
Oil leakage through plastic cylinder head plugs... In Mercedes-Benz engines M272 V6 and M273 V8s that were produced prior to June 2008 may experience oil leakage (seepage) through the round plastic expansion plugs on the back of the cylinder heads.
There were two types of stubs of different sizes:
- A 000 998 55 90: two small expansion plugs (approx. 2,5 cm in diameter);
- A 000 998 56 90: one large small expansion plug (for engines without a vacuum pump).
To fix this, you need to remove the existing plugs, clean the hole, and install new plugs. Do not use sealant when installing new plugs.
In June 2008, new bushings were put into production, which are not subject to oil leaks.
Breakage of the damper regulator in the intake manifold (variable intake geometry). Due to forced ventilation of crankcase gases, carbon deposits can accumulate in the intake manifold, which impedes the movement of the control mechanism, which leads to its breakdown.
Symptoms:
- Rough idle;
- Loss of power (especially at low and medium engine speeds);
- Illumination of engine warning lamps;
- Diagnostic Trouble Codes (DTCs) such as P2004, P2005, P2006, P2187 and P2189 (decoding OBD2 error codes).
Mercedes-Benz М273 engine tuning
Tuning the M273 engine assumes atmospheric and compressor options (both kits can be found at Kleemann):
- Atmospheric. Installation of camshafts with a phase of 268, finalization of the release, cold intake, modified firmware.
- Compressor. The Kleemann company offers a compressor kit for the M273 without the need to modify the standard piston compressor due to the low boost pressure. With the installation of such a kit, you can reach 500 hp.
