The diesels now featured common raildirect fuel injection and variable geometry turbochargers. Six-speed manual gearboxes were now standard for the entire range, except the C The third body variant, a station wagon codenamed S arrived in Then in for the model year, a new family of supercharged four cylinder engines, dubbed M , debuted for the entire range C-Class range. All of them used the same 1. The C Kompressor variant sported kW hp. The newer 1.
Over 30 percent of total sales occurred in Germany, and over 20 percent in the United States. Performance 95 kW PS at rpm. Acceleration Weight 1 kg. Fuel gasoline. Engine 1 ccm cui , 4-cylinder, In-Line, valves, M Weight 2 kg.
Performance kW PS at rpm. Fuel diesel. The tensioner uses oil pressure to apply tension to the chain when the car is running. There is also a spring that applies some tensions when the engine is off and there is no oil pressure. What happens is that when the chain is stretched too much, the spring alone cannot apply enough tension, and it becomes possible for the loose chain to jump some teeth on the timing gears.
I believe this is why most of the M failures occur during engine start up. When the chain skips, major engine damage can occur if the valve timing goes out of sync far enough for the valves to hit the pistons.
For some reason, Mercedes-Benz decided to use a single row timing chain in the M engine while its predecessors, the M and the even older M, had double row timing chains, which were very reliable.
The timing chain should be watched in the M If it starts showing any symptoms of stretch, it should be replaced. There have been cases of chain failures at 80k miles, and there are cars that go far past k without any problems.
In my opinion, you should treat the chain as a k miles service item if you want to be really safe. Get one that already had the chain and chain tensioner replaced. The replacement chain should be good for another k miles. Buy the car, and plan to get the timing chain replaced at some point. The timing sprockets may need replacing as well if they are worn. A typical symptom of a stretched timing chain is a chain rattle that lasts a couple of seconds after a cold start.
In severe cases, the engine may be difficult to start as well. Click here to learn more about timing chains and how to check them. M engine - timing chain stretch. Mercedes-Benz employed VVT in most petrol engines from that time. The VVT system is operated using two camshaft solenoids attached to the front of the engine. The solenoids occasionally develop minor leaks , which would normally be completely harmless.
However, in the M the electrical plugs that connect the solenoids are pointing down…. What happens is that oil, leaking out of the camshaft solenoids, can enter the wiring harness and embark on a great journey through the wiring to the oxygen sensor, mass airflow sensor MAF and finally the Electronic Control Unit ECU.
This is possible because of capillary action — the ability of a liquid engine oil in this case to flow through narrow spaces wire strands without the assistance of any external forces. If this sounds astonishing, think about how difficult it is to predict such behaviour. If oil gets into the wiring harness, most of it will end up at the oxygen sensor , which usually fails first. The solution is simple — fix any leaks from the camshaft solenoids, and fit short extension cables pigtails so that the capillary action is interrupted at the pigtail.
With the pigtails fitted, the oil cannot travel further to the actual wiring loom, which is plugged into the pigtail. They are on the front of the engine and easy to get to. If the oil has already contaminated the wiring loom, then it will need to be cleaned or replaced. Once you buy the car, fitting the extensions is cheap insurance — much cheaper than replacing the oxygen sensor, MAF, or the ECU. Please note that many cars will have the extensions already fitted — there was a service campaign regarding this issue.
M engine - capillary action oil in wiring loom. The M V6 engines are equipped with a balance shaft. A balance shaft is an eccentric weighted shaft, which is used to eliminate engine vibration.
It is driven by the timing chain as it needs to in sync with the engine pistons. A balance shaft is needed to make a V6 engine smooth because they are inherently unbalanced. The M engines, that were manufactured between and , are fitted with balance shaft gears and idler gears that can wear out prematurely.
As these gears wear, the engine timing is altered due to increased slack in the timing chain. As the sprockets continue to wear, the engine will develop a rattle from the loose timing chain. All the while, more and more metal is being ground away from the gears. If not fixed, one of the gears may fail eventually and take the engine out valves hitting the pistons.
It is a problem that you should not ignore. It is very labour intensive, which makes this a very expensive repair. Engines with serial numbers higher than Some engines seem to last despite having the unlucky gears, but I would not take the risk. In my opinion, affected engines are fine only as long as there is proof that the faulty gears along with a number of other parts have been replaced, and the engine is running well after the repair. M engine - soft balance shaft gears.
The intake manifold in these engines is very complex. The typical cause of failure is increased friction in the mechanism from the accumulation of oil and carbon deposits in the intake manifold. Additionally, over the years the plastic parts in the mechanism become weaker and more brittle. Luckily, there are repair kits available on the market these days, which makes this a much smaller issue.
These are standard systems used on virtually all road cars. M engine - variable intake manifold. The pre OM engines were notorious for leaking oil from the oil cooler seals. Updated seals purple colour were introduced in There was a recall for this issue, so hopefully, most vehicles would have had the seals replaced by now. Before buying one, check if the seals have indeed been replaced and inspect the car for oil leaks.
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