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However, a second class action lawsuit was filed in October 2012 in Northern California, covering Mercedes-Benz models manufactured between 20. This suit was ultimately dismissed with the judge agreeing with Mercedes that because the gears fail at 60 -80K miles and outside of the warranty period, Mercedes is not legally responsible for these problems. Mercedes-Benz USA, LLC), which alleged the M272 engines are equipped with defective balance shafts gears which "wear out prematurely, excessively and without warning, purportedly causing the vehicles to malfunction, the check engine light to illuminate and the vehicle to misfire and/or stop driving." The suit further alleged that Mercedes knew of this problem, sending out repair bulletins on how to address this issue and ultimately changing the balance shaft gears to avoid this problem. These complaints led to a class action lawsuit against Mercedes-Benz (Greg Suddreth and Paul Dunton v. M272 engines that were sold between 20 with engine serial numbers below 2729.30 468993 often show early wear of the balance shaft gears, requiring extensive repairs at a retail cost of over $4,000. 2005–2014 W639 Viano (known as the M272 978 in China)īalance shaft gear and other issues.This was achieved by raising the rev-limit to 7200 rpm, increasing the compression ratio using enhanced, weight-optimized pistons with a curved surface, reinforcements in the area of the piston pins, deeper pockets for the valve seats, single-stage intake manifold, lightweight valves with sodium cooling, conical valve springs, tri-oval chain sprocket, and a new cylinder head. First fitted to the CLS350 CGI, it produces 292 PS (215 kW 288 bhp) and 365 N⋅m (269 lb⋅ft) of torque while lowering fuel consumption. A direct injected variant debuted in 2006 under the name Stratified-Charged Gasoline Injection (CGI). Also tumble flaps are used to improve output at low engine speeds. New electronic coolant flow control has replaced the mechanical thermostat for improved engine warm-up and optimum control of engine temperature. The twin spark plug system was replaced by a regular single spark plug per cylinder. Featured on both the intake and exhaust camshafts, each can be varied through a range of 40 degrees. A dual-length Variable Length Intake Manifold is fitted to optimize engine flexibility.Ĭontinuous VVT was adopted for the first time. This essentially eliminates first and second order moments. Like the M112, a balance shaft is installed in the engine block between the cylinder banks to deal with vibrations in the 90 degree V6 design. All have forged steel connecting rods, one-piece cast crankshaft, iron-coated aluminum pistons and a magnesium intake manifold. The aluminum DOHC cylinder heads have 4 valves per cylinder. Introduced in 2004, it is based on the M112 V6 introduced in 1998.Īll M272 engines have aluminum engine blocks with a 90° V-angle with silicon/aluminum lined cylinders. The Mercedes-Benz M272 engine is an automobile piston V6 engine family used in the 2000s (decade).
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