: Electro-hydraulically operated vane adjusters located at the front of each of the four camshafts. They can vary timing by up to 40 degrees. Camshaft Solenoids
This is the foundation. All M272 engines use an with a 90-degree V-angle. The cylinders are lined with a silicon/aluminum alloy , which provides a durable and low-friction surface for the pistons.
: The M272 uses a Dual Overhead Cam (DOHC) design with four valves per cylinder. Diagrams show four camshaft adjusters (vane-type, oil-controlled) and four Hall-effect camshaft position sensors . A critical component in these diagrams is the balance shaft , located between the cylinder banks to counteract vibrations.
Wikipedia, AustralianCar.Reviews, MercedesClub.cz. Mercedes Benz M272 Engine Parts Diagram
Before buying any parts for an M272, cross-reference the diagram with your engine serial number (stamped on the block near the starter). The difference between a pre-revision and post-revision balance shaft can mean the difference between a running engine and a pile of scrap metal.
A double-row roller chain connects the crankshaft gear to the camshaft adjusters and the balance shaft.
Looking at a top-down view of the M272 parts diagram, the most prominent features are the two aluminum cylinder heads (Left and Right banks). The M272 uses a 4-valve-per-cylinder configuration—24 valves total. All M272 engines use an with a 90-degree V-angle
Seal the top of the cylinder head. Brittle gaskets cause common oil leaks into the spark plug wells. 2. Intake Manifold Assembly (The "Swirl Flap" System)
A heavy-duty roller chain looping around the crankshaft gear, balance shaft gear, and the four camshaft adjusters.
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Look at the front timing cover . The worn gear is hidden behind this, requiring massive disassembly (engine removal is common) to replace.
Includes an aluminum replacement for the fragile plastic front tumble-flap linkage arm.
On the diagram, identify the and Rails (Guides) . These plastic guides become brittle over time. If you are doing a rebuild, these are the "while you're in there" parts that must be replaced.
If left unaddressed, the camshafts fall out of sync with the crankshaft, which can ruin the engine. Fixing this requires a complete teardown of the front timing cover to replace the balance shaft gear and timing chain components. Later production engines (with serial numbers generally past ) received updated, hardened steel gears, effectively eliminating this problem. Other Common Maintenance and Wear Points
The plastic triangular lever on the front of the intake manifold frequently snaps. Instead of buying a completely new manifold from Mercedes, you can purchase aftermarket aluminum repair kits to replace just the broken linkage. 3. Engine Block, Pistons, & Crankcase