Peak torque arrives at 5000-rpm with most of this available from 2500-rpm. The entire balance shaft must be replaced. If I had a better place to do the work I'd do it in a heartbeat. If you have concerns about the cost of the repair, it would be in your best interest to contact the manufacturer to find out more information. It is important to note that the costs will likely only be covered for specific Mercedes models and years. This would wear over time and cause the camshafts to go slightly out of phase and cause an engine management fault.
The Mercedes-Benz M272 and M273 engines were part of a class action suit Greg Suddreth and Paul Dunton v. So yeah not going to be one of those idiots having to bring a jacked up non running car to the pros to fix. One issue that is commonly seen in repair shops is a faulty balance shaft gear. The Mercedes-Benz Owners is a completely independent organisation. Qualification for membership is for owners of such cars and true enthusiasm for the marque. While these issues are common, they are certainly frustrating for Mercedes drivers who expect quality and reliability from such luxury performance vehicles.
The M272 and M273 engine introduced in 2006 have had problems with the timing resulting from a worn balance shaft sprocket M272 or timing chain idler gear on the M273. If it's the balance shaft that's the problem, no doubt I will raise a massive stink if they don't want to cover it. And leads on where to get them? If you remove the timing chain then you removed the chain tensioner. Know the correct procedure as the M272 and M273 valve covers are bonded on and the timing is checked with the four cam sensor removed and the engine rotated until all 4 stamped circles on the pulse wheels are centered in the holes at a specific crank angle. Other attempts at bringing a class action suit against Mercedes-Benz have met with similar dismissed outcomes, leaving owners of the M272 and M273 with having to pay for the repairs themselves. They are fast, durable, and efficient, making them a commodity in the auto industry. While these issues are common, they are certainly frustrating for Mercedes drivers who expect quality and reliability from such luxury performance vehicles.
Its not my favorite job in the world. 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. When doing this, the M272 never sounds harsh, and will rev to beyond 6k building power all the time. These symptoms are concerning for Mercedes drivers, as well they should be. Mercedes Badge Image credit goes to:.
To achieve even firing pulses throughout the 4-stroke 720-deg cycle, a 6-cylinder engine should produce a power stroke every 120-degrees. They are released by turning the engine backwards at a specified torque while holding the right exhaust camshaft fixed. In fact, since this is the most common problem with certain Mercedes-Benz models, it is more than likely that an experienced car repair shop will have seen it and dealt with it on numerous occasions. Pull the pin out fully, it only goes one way. It may require two revolutions of the crank to get the lines in a position where they can be checked. They are fast, durable, and efficient, making them a commodity in the auto industry.
Regardless, you need to take up the chain slack to get a valid measurement so always only rotate in the direction of normal engine rotation. If it isn't you might have code relative to the timing being off beyond a specified limit in the engine software. Some of the signs of early deterioration of the part include: rough idling and rough running including engine stalling and engine misfiring; intensified rattling noises with increased acceleration; and the illumination of the check engine light. Check with the dealer of you have this issue with either or both codes 1200 and 1208 as they may cover part of the repair. The repair involves removal of the engine, oil pans and front cover and all cam actuators, we replace the balance shaft or idler gear, the chain, any worn guides, the sheet metal pan if bent, the oil pump, the oil level sensor, and all parts supplied in the kit.
The M112 and M113 engines built between 1999 and 2005 have been very reliable with respect to timing chains and in general. Furthermore, the symptoms may come on suddenly around more than halfway to your 100,000 —mile engine check —up. I picked up a 07 C280 that is throwing codes that make me think I might have this balance shaft problem. I'll add a bit more from my thoughts. However, due to several class action lawsuits, the Mercedes manufacturer may cover the costs of the repair. Furthermore, the manufacturer may only cover a portion or percentage of the costs. Our warranty is 3 year 36,000 miles nationwide.