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Old 11-27-2007, 03:56 AM   #1 (permalink)
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Vehicle: 2004 CLK 240 Coupe
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Do I have an 'Interference' engine?

Hi guys

My CLK 240 is a model that was sold in the European & Pacific regions, but never in the US.

The engine is the M112, 2.5 liter, 3valves/cylinder, SOHC, V6. I believe that the same M112 engine was used in the C240 which was sold in the US.

Question is: Is this an Interference engine?
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Old 12-05-2007, 10:15 AM   #2 (permalink)
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i think so...most mercedes engines now a days are interference engines. Then again, they run a chain instead of a standard belt...
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Old 12-05-2007, 03:00 PM   #3 (permalink)
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c/d - thanks for your input...

By coincidence i dropped by my nearest MB dealership today, and put this question to a Master Tech at the service desk.

After a moments thought, he said that every petrol engined Mercedes Benz built since about 1980 had an Interference engine.

But the up-side is, instead of a timing belt just snapping as on some 'lesser cars', with the double chain on its timing system, an MB will give adequate warning (by the noise particularly at start-up) of a very worn timing chain. That's good to know.
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Old 12-06-2007, 10:40 AM   #4 (permalink)
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Quote:
Originally Posted by keyhole View Post
c/d - thanks for your input...

By coincidence i dropped by my nearest MB dealership today, and put this question to a Master Tech at the service desk.

After a moments thought, he said that every petrol engined Mercedes Benz built since about 1980 had an Interference engine.

But the up-side is, instead of a timing belt just snapping as on some 'lesser cars', with the double chain on its timing system, an MB will give adequate warning (by the noise particularly at start-up) of a very worn timing chain. That's good to know.
That's kinda funny...in the 1980s, MB put out a lot of single chain engines....which lead to a lot of engine failures.
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Old 12-06-2007, 11:58 AM   #5 (permalink)
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That's kinda funny...in the 1980s, MB put out a lot of single chain engines....which lead to a lot of engine failures.
Not all single row timing chains were a problem, e.g. 103 motor chains are bulletproof. And MB did acknowledge the problem on the 380s and came out with the double row fix. And the 380 problems generally did give a warning - which many owners ignored to their peril.
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