![]() On the interstate, accelerating past 80 is much faster, reaching 90 in no time. >EDIT: Do it! My car is much faster now, I've been losing hp due to the loose belts- and probably losing some fuel economy. Your M111 will run MUCH better after you change them, with the surprising bonus of better transmission smoothness. The moral of this story is that belt tensioners are wear items - they lose their strength over time and need to be replaced. Maybe it was just in my head, but the car downshifted faster, and I heard the supercharger whine louder than before. After the supercharger tensioner change, I again felt a bit of a smoother shift, a quieter engine, a better idle, but at one point I put the hammer down, and I noticed a bit quicker acceleration. I would not trust any brand but Litens, because only Litens has actually guaranteed its tensioner to Mercedes-Benz.Īfter the accessory ("serpentine") tensioner change, I noticed smoother shifting in my 722.6, as well as a quieter engine. They are basically precision springs, designed to hold a certain pressure value, and tested by Litens and Mercedes until the best possible combinations are derived. Since there have been no M111 engines sold in the USA for almost 10 years, there should be plenty of engines out there that can benefit from having these belt tensioners changed. The M111 was not engineered in the days of "NVH" awareness - that is Noise, Vibration, and Harshness. The second tensioner affected overall engine smoothness. Then let the tensioner move back to the right. Using an E10 reverse torx and a long ratchet, push to the left to move the entire tensioner assembly (tensioner + pulley) to the left, and holding steady, slide the belt forward off the pulley. Thread Size: Wheel Tightening Torque: Tire, Rim, Offset Range mm, Backspacing mm inches, Tire Weight kg lb, Tire. ![]() This pops off with a flathead screwdriver. Bolt Pattern (PCD): Wheel Fasteners: Lug bolts. The tensioner's pulley has a little plastic cover on it, with the pullback bolt poking through. The Mercedes star and the Mercedes part number had been sanded off. It arrived in an Ina box, but was the Litens part. I bought it from Pelican Parts, added an oil filter and got free shipping. The original tensioner was made by Litens. That being said, this was an error that ended up costing me about $75, but made a great improvement to my car. If I ever have to leave my car at a non-MB shop again, I will let the mechanics know what the bolts in the tensioners are. That way any future catastrophic failure could be more easily dealt with by a garage. Because I depend on this car for business reasons, I decided to change the tensioner. He tried so hard he ended up stripping the bolt. In some cases, you may need longer lug nuts, and we have provided a link for that, as shown below.A mechanic who was not familiar with the belt tensioner tried to unbolt the pulley using the pullback bolt. If you will install bigger rims, use the Tire size calculator below to compare the stock wheel size with the new one, you want to install. ![]() The second number, for example, 112, is the circle’s diameter created by the 5 bolts in millimeters. The first number, 5, indicates the number of bolt holes. Look it up by chassis or by year and model. Mercedes Benz Wheel rim Bolt Pattern Reference Table. ![]()
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