Join Date: May 2010
Vehicle: 2005 SLK 55; 2005 SLK 350
Other Toys: Several past R170's
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Exactly how does the M272 camshaft timing adjustment work?
There's copious posts (here and on other sites) about M272 engine timing, camshaft adjustment, balance shaft wear, hall sensors, and magnets. But I can't find anything about how the variable camshaft timing actually works. Obviously: 1) the camshaft timing adjustments are under the control of the Motronic ECU, and 2) each camshaft has it's own actuator and sensor. But the specifics of how the actuator, sensor, and ECU work and interact with one another aren't so obvious.
The training slides mention that the adjuster is "vane-type, oil pressure controlled". I wonder what that means really? Engine oil?
There appears to be a magnet involved -- I assume it's an electromagnet. Does its magnetic field control the camshaft timing? Is it also used for sensing?
What are the possible MB codes that can be posted related to the camshaft timing?
I'll post back any further information I find; if you have some, please share!