Description

Mercedes-Benz OM 471 2011 Technical Manual

You’ve got a Mercedes-Benz OM 471 on the lift, and the customer is waiting. The aftermarket PDF you obtained says 210 ft-lbs for the cylinder head bolts. But the factory spec? Not even close. That kind of guesswork costs you a head gasket job twice. I’ve been wrenching for 28 years, and I’ve seen it happen more times than I can count. This Mercedes-Benz OM 471 2011 Technical Manual – factory printed, not some third-party recompile – gives you the numbers straight from Stuttgart. 225 pages, no filler, just the data you need to get it right the first time.

Engine OM 471: Technical Data and Torque Specs

Page 11 holds the technical data for the OM 471 inline-six diesel. This isn’t a summary – it’s the full factory table: bore, stroke, compression ratio, max torque, and the firing order. Need the charge pressure? It’s right there. The manual splits everything into as-built configuration descriptions and function descriptions. That means you get the exact part variants for each production run, not a one-size-fits-all guess. For torque values on the cylinder head, you’ll need the later maintenance instructions in WIS, but this brochure gives you the foundation every tech should start with before touching a wrench.

What Does the Manual Cover Beyond the Engine?

The exhaust aftertreatment system (EATS) is half the battle on these trucks. The manual devotes a full section to how the EATS integrates with the engine – component descriptions, function logic, and as-built variants. If you’re chasing a regeneration fault or a DEF system code, you need to understand the factory design intent. Aftermarket diagrams often skip the sensor locations and wiring paths. This manual doesn’t. It also covers the cylinder head cover as-built configuration (page 12) and the cylinder head itself (page 13). That level of detail separates a comeback from a job that stays done.

As-Built Configuration: Cylinder Head and More

One thing that drives me crazy is when techs swap parts without cross-referencing the as-built code. The OM 471 had multiple variants depending on the build date. The manual spells out exactly which cylinder head cover fits which engine serial range, and which injector sealing washers to use. Skip that step and you’ll be pulling the valve cover again in a month. The factory spec for the as-built configuration is written by the engineers who designed the damn thing. Trust that, not a parts store lookup.

Exhaust Aftertreatment System (EATS): Factory Diagnostics

EATS faults are where most DIY guys and even some shop techs get lost. The manual gives you the function description before the component description – meaning you understand how the system should behave before you start poking at sensors. It covers the DPF regeneration strategy, SCR catalyst monitoring, and the NOx sensor plausibility checks. That alone will save you hours of scan-tool scrolling. If you’re working on a Unimog with the same engine, check the 2007 Unimog Technical Manual – BlueTec Diesel System for complementing data on the aftertreatment layout.

3 Reasons to Stick with OEM Documentation

First: torque specs. I don’t care if you’ve memorized the bolt tightening sequence – the manual’s page 11 values are the only ones I’d trust on a head gasket. Second: wiring diagrams and connector views are available in WIS, but this manual’s function descriptions give you the logic behind the wires. Third: safety. The manual includes warnings about high-pressure injection systems and exhaust temperatures during regeneration. Aftermarket reprints often strip those out. You don’t want to learn that lesson the hard way.

For older chassis with a manual transmission, the torque specs for bellhousing bolts are also referenced in the engine mounting section. Cross-check those with the Manual Transmission service guidelines from the factory. But remember: this OM 471 manual is specifically for the engine and aftertreatment – not the gearbox. For a full drivetrain overview, pair it with the Mercedes-Benz W220 2012 Technical Manual – ACC Hidden Menus if you’re working on passenger-car related systems, or the Mercedes-benz SL-Class 2013 Technical Manual – Factory Specs for comparison on smaller engines.

The manual covers the OM 471 as of September 2011. Any updates after that went into the Workshop Information System (WIS). That means you’re getting the baseline that every subsequent technical bulletin builds on. Without this, you’re working blind. The Manual Transmission section in some aftermarket guides might claim to cover the OM 471, but they don’t have the authority of this factory document. Period.

So here’s the bottom line. If you’re a shop owner, a fleet mechanic, or a serious DIYer who doesn’t have time to redo work, this manual is your insurance policy. 225 pages, OEM data, factory copyright. No reprints, no third-party guesses. Access the Factory Manual and get back to turning wrenches with the right specs.

Does this manual include wiring diagrams?

No, wiring diagrams are in WIS separately.

What engine variants are covered?

The manual covers the OM 471 inline six-cylinder diesel engine as built in 2011, including all as-built configuration descriptions for cylinder head, block, timing, and the exhaust aftertreatment system (EATS). It also includes function descriptions and component descriptions. It does not cover later updates; those are in WIS. If you need service procedures like removal and installation, you’ll need the WIS documents – this is the technical introduction manual.