How to adjust the timing on an older Mercedes-Benz E350?
3 Answers
Disconnect the battery ground cable, remove the ignition coils, and remove the spark plugs. Pull in the new engine timing chain and rivet it, then rotate the crankshaft in the engine running direction to 55° before the top dead center of cylinder 1 ignition. Rotate the crankshaft 95° in the engine running direction to position it at 40° after the top dead center of cylinder 1 ignition. With the front cover already installed on the cylinder head, check the basic position of the camshaft at 55° before the top dead center of ignition. Install the spark plugs, install the ignition coils, perform an engine test run, and check for any engine leaks.
I'm a vintage car enthusiast and have done quite a bit of Mercedes maintenance myself, especially on older E350 models. Timing adjustment is particularly interesting. First, you need to ensure the engine is cool, then locate the TDC (Top Dead Center) mark on the crankshaft, usually near the timing cover. Use specialized tools like cam locks to secure the camshaft position. Next, remove the valve cover and check the slack in the timing chain. If the chain is worn or stretched, replace it along with the kit and realign all the marks—both the cam gear and crankshaft gear must be properly aligned. The whole process requires a timing tool kit and a repair manual for guidance—don't skimp on these. DIY can save you labor costs, but imprecise work can damage engine valves, so I recommend beginners watch video tutorials or get help from friends. Once done, the engine starts up with a smooth sound, and the sense of accomplishment is truly rewarding.
As an average car owner, I have great respect for the timing work on the Mercedes E350 – it's a high-risk job. The engine is so precise that misaligned timing can cause pistons to hit valves, and repairs can cost thousands, making it not worth the risk. Safety first means leaving it to professional technicians; they use diagnostic tools to calibrate the crankshaft to top dead center, lock the camshaft position, and ensure proper chain tension. DIY attempts can easily misread markings, so don’t try it without experience. Spending some money at a repair shop for peace of mind is wise, and regular maintenance can prevent future issues, especially since older cars' chains are prone to wear.
