Installation Method for Mercedes-Benz 274 Timing?
2 Answers
For the timing chain installation of the Mercedes-Benz 274 model, you need to use specialized tools. After fixing the camshaft with the dedicated tool, locate the mark on the crankshaft pulley, identify the top dead center of the first cylinder's compression stroke, and then install the timing chain. The M274 engine is part of the MRA (longitudinal) modular platform, with an actual displacement of 1991mL (2.0L). Depending on the tuning, it comes in low and high power versions, with maximum power outputs of 184PS and 211PS, and peak torques of 300N·m and 350N·m, respectively. The high-power version of the M274 2.0L engine shares nearly identical power parameters with the M270 2.0L turbocharged engine. The M274 engine has already been used in the GLK260 and will be applied in the future to other longitudinally arranged models such as the domestically produced new C-Class, the new E-Class, and the GLK.
I just replaced the timing chain on my Mercedes 274 engine, and it took me a whole day. First, I gathered the necessary tools: a torque wrench, Mercedes-specific alignment tools, and the chain kit. When removing the front engine cover, I had to be careful not to scratch other components. Then, I slowly rotated the crankshaft to align the marks on the camshaft—the Mercedes 274 has dedicated alignment holes that must be locked in place with the tool. Any misstep could cause the chain to skip, leading to engine noise or even valve damage. When installing the chain, I made sure the tensioner was correctly positioned and tightened the bolts to the manual-specified torque, double-checking for smooth operation. The whole process was quite demanding, but after completion, the car's acceleration became noticeably smoother, and I saved on repair costs. I recommend having a partner assist you, wearing protective gloves, and prioritizing safety. Regularly checking the chain for wear can also prevent major issues.
