FAQs—Mercedes Benz 280 C
I recently fixed my Mercedes Benz 280 C's vacuum because it was leaking blue smoke. It ran well for the first couple of weeks but became problematic again during the third week. The exhaust reeked of fuel and starting up the car became a nightmare—I had to keep pressing the gas pedal down. Can you help me diagnose and fix the problem?
Odor emission from the exhaust signals that the fuel is burning too quickly because it is too rich. You need to clean out the fuel system, take the tank out, and replace the filters. To do this, you have to empty the tank first and then remove the fuel lines. Cleaning the tank is the challenging part; if you do not have the tools and experience, it would be best to visit a specialist and get it steam cleaned to take out gunk, excess varnish, and rust. You can also ask him to check if part of it needs to be welded. Afterwards, replace the fuel filter and clean out and readjust the carburetor. To address the cold start issue, you might need to bleed the fuel system and inspect the accelerator pump to see if you need to get it replaced. You can also spray carb cleaner around the intake manifold to prevent leaks due to warping.
I am currently restoring a Mercedes Benz 280 C and thinking of upgrading its engine by adding a supercharger and swapping it with a more powerful MB V8 from other Mercedes Benz models. I'm also thinking of changing its transmission to a 5-speed model. Is this feasible?
You have to make sure that the engine you want to install fits the sub-frame of the 280 C. Some models that share a similar sub-frame include the SL and SLC coupes. The 450 SL has a 4.5-liter V8; its US model produces around 180 hp. You can also check out the European M110 engine for the 280 C. It produces 185 hp, so it is also a good choice for increased performance. The M130 engine is another option; it's an SOHC 6-cylinder engine that can go up to 165-180 hp with a supercharger or reach even 200 hp with a turbo charger with a low boost of 5 to 7 lbs.
My Mercedes Benz 280 C has ran over 120,000 miles, and I am now about to reset its valve lash. Do I need to replace the timing chain as well? I bought the car 20 years ago with 90,000 miles on it, and I am not sure if the timing chain was replaced that time. Please advise.
You can get an engine manual and find out how to measure chain stretch to find out if it needs to be replaced. Generally, the industry practice is to change the timing chain every 100,000 miles, although 4-cam engines often reach up to 150,000 miles without any issue. However, it would be best to simply replace it along with the tensioner and guide rails. These parts do not really cost much; it's better to be safe and avoid the risk of causing damage to the engine.