M112 engine reliability
The engine has reliable double-strand chain unlike the single-strand chain on the old M103 engine. In 1992 the engine got variable geometry intake manifold. The manufacturer produced the 2.8-liter and 3.0-liter versions also (M104 E30 and M104 E28). The next generation of 6-cylinder engines got V configuration. Kleemann M112 SuperCharger System Mercedes E Class V6 W211 02+ The KLEEMANN Kompressor system for the V6 (M112) engine is the very essence of the KLEEMANN slogan "Comfort Power." High power output combined with a low boost pressure of just 0.5 bar makes the system safe and provides long-term durability for the engine.
The M112 is actually a very durable and reliable engine. They suffer few if any problems (eg crank pulley as above - not expensive) and we have never had to dismantle one for any significant work. Mercedes got this one right. The M112 is the current V6 engine. Mine is the 2.6 in my '01 C240. This is the same engine, except different bore/stroke, as the 3.2 as in the new C320 and the E320. The engine I saw apart was a V8 which is basically the same engine, except with two extra cylinders. This is an absolutely state of the art engineering masterpiece.
Mercedes M112 3.2L Engine Review The M112 E32 V6 engine replaced inline 6-cylinder M104 E32 series on the production line in 1997. The new 112-series includes the following engines: E24 M112, M112 E26, E28 M112, M112 E32 ML, and M112 E37. The engine is designed in V configuration (the cylinder bank's angle is 90 degrees). mercedessource Product - Applies to the following chassis: 111, 108, 109, 107, 116 and 126. Includes 3.5, 4.5, 350, 380, 450, 500, 420, and 560 V8 engines from 1970 to 1991. When Mercedes introduced their small 3.5 liter V8 in 1970 it was hailed as a technological breakthrough in automotive engine design. That same basic design was produced for over 20 years right up into the early 1990s. The ...
The day before the complete failure of the Mercedes-Benz crank sensor the car cranked for almost a minute before it started. This became the last time the engine would fire up. In other words, if you're about to experience the Mercedes-Benz crankshaft position sensor problem your car might give you some warning. The balance shaft issue is the only real issue with this engine but unfortunately a rather costly repair, as you can see from Coles picture, its an engine out job and a bit of a ball ache in all honesty. Its not my favorite job in the world. The last one I had in with this fault swarfed the engine so bad we had to put another one in.
Ship your supercharger off to Magnuson and have then REBUILD the M112 and install the snout extension kit all for only 450.00! When it comes back to you, you will have a BRAND NEW supercharger. The 4.7L is a great engine... I ran mine into the ground and it never skipped a beat... It was whooping HEMI's as early as mid-2003 and never looked back.