How to check Mercedes timing chain for excessive wear or stretch

In this guide, you will find instructions on how to check the Mercedes-Benz timing chain for wear and stretch without tearing apart the engine.

Common symptoms that your Mercedes-Benz timing chain wear includes poor engine performance, reduced power, check engine light on and fault codes P0016 and P0017.

This guide is applicable to V6, V8 and V12 Mercedes-Benz engines found on C-Class, E-Class, S-Class, ML-Class, G-Class, GL-Class, R-Class and other models. 

What you will need


  • Crankshaft must be turned clockwise only. 


  1. Open the hood and remove the engine cover by pulling it up in order to access the crankshaft. check mercedes benz timing chain strech


  2. Remove the air intake hoses. remove air intake hose to access crankshaft position sensor and check timing chain marks


  3. Remove the camshaft position sensors. Some models have two camshafts position sensors on the intake and two on the exhaust side.mercedes timing check They are held in place with Torx bolts which require E Torx Sockets to be removed. remove mercedes crankshaft position sensor to check for timing belt sprocket wear p0016 p0017


  4. Place the 27mm socket on the crankshaft bolt.check mercedes timing chain sproket guide rails for wear


  5.  Turn the crankshaft clockwise until the 305-degree mark on the main pulley lines up with the mark on the engine case. The 305 stamp is printed on the pulley. Keep rotating the crankshaft clockwise, until the 305 stamp comes up to the top. how to check mercedes benz for timing chain wear


  6. Next, check the stamps on the camshaft by looking through the camshaft position sensor hole. Check all. On a good engine that has no timing chain, guide rails, sprocket wear the stamp should all be on the center of the hole. mercedes timing chain worn


  7. If one of the stamps is off center, your Mercedes-Benz timing is off. The problem could be due to a stretched timing chain, chain sprocket, timing chain guides, weak tensioner, etc.

This guide applies to many Mercedes-Benz models including W204, W211, W221, 906, S211, W212, W251 V251, W203, S212.

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By YOUCANIC on Jul 27, 2019


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