Mercedes M116 & M117 Engine Manuals Explained

Unlocking the Secrets of Mercedes-Benz M116 and M117 V8 Engines

For enthusiasts and mechanics dedicated to the classic Mercedes-Benz V8 models, understanding the intricacies of the M116 and M117 engines is paramount. These powerplants, found in prestigious vehicles across various chassis, are renowned for their robust engineering and longevity. To ensure these engines continue to perform at their peak, access to a comprehensive workshop manual is indispensable. This article delves into the specifics of the Mercedes-Benz Service Manual for V8 Engines M116 (3.5) and M117 (4.5), explaining its scope, content, and utility for anyone working on these iconic engines.

What is the Mercedes Benz M116 Workshop Manual?

The Mercedes Benz M116 and M117 Workshop Manual is a detailed technical guide specifically designed for the repair and maintenance of these V8 engines. The M116, a 3.5-litre V8, and the M117, a 4.5-litre V8, were key components in many of Mercedes-Benz's luxury vehicles during the 1970s and 1980s. This manual, originally conceived for the highly trained technicians in official Mercedes-Benz workshops, has become an invaluable resource for a wider audience. This extensive manual, spanning a substantial 572 pages, provides in-depth descriptions of repair tasks and parts replacement procedures for specific engine variants. It covers engine codes such as 116.980, 116.981, 117.981, 117.982, 117.983, 117.984, and 117.985, and 117.986. While its primary audience was professional mechanics, its detailed explanations, aided by clear images, diagrams, and tables, make it accessible and highly useful for experienced amateurs, DIY classic car restorers, and even those new to working on these sophisticated engines.

Comprehensive Coverage for M116 and M117 Engines

The breadth of information contained within this manual is truly impressive, touching upon nearly every aspect of engine operation, maintenance, and repair. Key topics covered include:

• General Technical Data: Essential specifications, tolerances, and performance metrics.
• Engine Removal and Installation: Step-by-step procedures for safely removing and refitting the engine.
• Cylinder Crankcase: Detailed instructions for inspecting, repairing, and assembling the engine block.
• Cylinder Head: Guidance on cylinder head removal, inspection, valve work, and reinstallation.
• Engine Breathing: Understanding and maintaining the engine's intake and exhaust systems.
• Crankshaft Assembly: Procedures for crankshaft inspection, bearing replacement, and assembly.
• Engine Timing: Crucial information on setting valve and ignition timing for optimal performance.
• Mechanically Controlled Gasoline Injection (CIS): In-depth coverage of the Bosch K-Jetronic fuel injection system.
• Electronically Controlled Gasoline Injection: Details on later electronic injection systems and their regulation.
• Ignition System: Maintenance and troubleshooting of the ignition components.
• Intake System: Air filter, intake manifold, and related components.
• Exhaust System: Manifold removal, gasket replacement, and emission control systems.
• Belt Drives: Inspection and replacement of serpentine and V-belts.
• Emission Control System: Understanding and maintaining the vehicle's emissions equipment.
• Electrical System (Engine Related): Wiring diagrams and troubleshooting for engine electronics.
• Engine Lubrication: Oil pump, oil cooler, and oil filter procedures.
• Engine Cooling: Radiator, coolant hoses, and thermostat maintenance.
• Engine Mounts: Replacement of engine and transmission mounts.
• Accelerator Control: Adjustment and repair of the throttle linkage.
• Fuel System: Fuel pump, lines, and filter maintenance.

The inclusion of detailed illustrations, diagrams, and tables throughout the manual ensures that even complex procedures are presented in an understandable format, making it a comprehensive resource for all levels of expertise.

Vehicles Equipped with M116 and M117 Engines

To fully appreciate the scope of this manual, it's helpful to know which vehicles it applies to. The M116 and M117 engines were fitted to a range of iconic Mercedes-Benz models:

Mercedes-Benz Vehicles with M116 (3.5-litre) Engine:

• W107 Series: 350 SL and 350 SLC
• W108 Series: 280 SE 3.5 and 280 SEL 3.5
• W109 Series: 300 SEL 3.5
• W111 Series: 280 SE 3.5 Coupe and Cabriolet
• W116 Series: 350 SE and 350 SEL

Mercedes-Benz Vehicles with M117 (4.5-litre) Engine:

• W107 Series: 450 SL and 450 SLC
• W108 Series: 280 SE 4.5 and 280 SEL 4.5
• W109 Series: 300 SEL 4.5
• W116 Series: 450 SE and 450 SEL

This extensive application list highlights the importance of this manual for owners and restorers of these classic luxury cars.

Digital Format and Accessibility

In today's digital age, the availability of this workshop manual in PDF format offers significant advantages. This digital version is identical in content to the original printed manual but provides the benefit of instant download access. It can be conveniently read on personal computers, tablets, or smartphones, and users can print specific pages as needed for workshop use. The inclusion of a bookmark index further enhances navigation, allowing users to quickly jump to different chapters and sections. This makes troubleshooting and repair tasks far more efficient. Key Product Characteristics:

Additional Resources and Related Manuals

While the primary 572-page manual covers the M116 and M117 3.5/4.5 litre engines, it's worth noting that other related manuals exist for different engine displacements and chassis. For instance, a separate manual exists for the M116/M117 V8 engines with 4.2/5.6 litre displacements, applicable to models like the R107, W126 560SL, 420SEL, 560SEL, and 560SEC. This manual, often around 639 pages and 45.5 MB, provides similar detailed coverage for these later variants. Furthermore, specific technical documents might be available for systems like the K-Jetronic fuel injection, which was prevalent in many M116 and M117 powered vehicles. Files detailing the dismantling and overhaul of the K-jetronic fuel distributor are crucial for diagnosing and rectifying common running issues and poor fuel economy often associated with these systems.

Understanding Engine Identification: M116.965 Gas Engine

When discussing Mercedes-Benz engines, the alphanumeric codes are critical for precise identification. For example, the 'M116.965' designation refers to a specific variant of the M116 engine. This particular engine is often associated with the W126 chassis, specifically models like the 420SEL from the 1986-1991 model years. Such engines are typically remanufactured to factory specifications, involving extensive refurbishment of key components. When purchasing a remanufactured engine like the M116.965, understanding what is included is vital. A 'longblock' assembly, for instance, usually includes the core engine components such as the block, crankshaft, connecting rods, pistons, cylinder heads, camshafts, and valves. However, it typically excludes ancillaries like manifolds, fuel injection components (unless specified), engine management systems, electricals, starter, air conditioning, power steering, or clutch assemblies. Core charges are also a common aspect, where a deposit is refunded upon return of the old engine core, provided it meets certain criteria.

Frequently Asked Questions

Q1: How long does it take to download the M117 engine manual?A1: Download times vary significantly depending on your internet connection speed and the file size (typically around 67.4 MB for the 572-page manual). A good broadband connection should complete the download in a few minutes. Q2: Can I use this manual if I'm not a professional mechanic?A2: Yes, absolutely. While written with professionals in mind, the clear diagrams, step-by-step instructions, and detailed explanations make it suitable for experienced DIY enthusiasts and classic car owners looking to perform their own maintenance and repairs. Q3: What specific engine codes are covered in the 572-page manual?A3: The manual covers engine codes 116.980, 116.981, 117.981, 117.982, 117.983, 117.984, 117.985, and 117.986. Q4: Does the manual cover the 5.6-litre M117 engine?A4: While the primary manual focuses on the 3.5L M116 and 4.5L M117, there are separate manuals available for the later 4.2L and 5.6L variants of the M117 engine, often found in models like the W126. Q5: What are core charges when buying a remanufactured engine?A5: A core charge is a refundable deposit paid when purchasing a remanufactured part. It is refunded when you return your old, used part (the 'core') to the supplier, provided it is in a rebuildable condition. This helps ensure a supply of cores for future remanufacturing.

Conclusion: The Essential Companion for M116/M117 Owners

For anyone passionate about maintaining or restoring Mercedes-Benz vehicles equipped with the M116 or M117 V8 engines, a quality workshop manual is not just a recommendation; it's a necessity. The comprehensive nature of these guides, coupled with their detailed illustrations and clear instructions, empowers owners and mechanics to tackle any task, from routine servicing to complex overhauls. Investing in the right manual ensures the continued performance and preservation of these magnificent V8 engines, keeping the spirit of classic Mercedes-Benz motoring alive.

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