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Mercedes-Benz Service Manual Engine 103
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Workshop manual for the Mercedes-Benz M103 inline 6-cylinder engine, covering 2.6 and 3.0-liter versions
Includes factory technical information for engine diagnosis, disassembly, adjustment and repair, with content applicable to Mercedes-Benz models equipped with the M103 engine in the W124, W201 and W126 series. Although it is not a manual specifically for the W107 chassis, it is also useful as a technical reference for owners of that model equipped with this engine.
PDF in English | 468 pages | Instant download.
- Technical data and specifications
- Timing system, cylinder head and valvetrain
- CIS-E injection, ignition, lubrication and cooling
- Useful for maintenance, repair and restoration
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Mercedes-Benz Service Manual Engine 103 | PDF
Factory service reference covering key workshop procedures for Mercedes-Benz M103 2.6 and 3.0-liter engines.
The Mercedes-Benz M103 was one of the brand’s most representative inline-six engines during the 1980s and early 1990s. Available in 2.6 and 3.0-liter versions, it combined a single overhead camshaft, a 12-valve layout, and the Bosch CIS-E / KE-Jetronic injection system, and was used in Mercedes-Benz models from the W107, W124, W126, W129, W201 and W463 series.
This edition brings together workshop procedures, service tables, diagrams and factory technical specifications for diagnosis, maintenance, repair and restoration work on the M103 engine. Although it is not a manual specifically for the W107 chassis, it can also serve as a useful technical reference for owners of that model equipped with M103 engines.
To review the included content more precisely, you can check the Full Index tab, where the groups and operations in this edition are detailed.
Main topics covered in the Mercedes-Benz M103 engine manual
- General information and technical data
- Engine crankcase and cylinder head
- Crankshaft assembly
- Engine timing and valvetrain
- Mechanically/electronically controlled gasoline injection system (CIS-E)
- Air cleaner
- Accessory belt drive
- Intake and exhaust manifolds
- Engine electrical system
- Engine lubrication system
- Engine cooling system
- Engine mounts
- Throttle control
- Fuel system
- Exhaust system
Mercedes-Benz vehicles associated with the M103 engine
- W107 Series: 300 SL
- W124 Series: 260 E, 260 E 4MATIC, 300 E, 300 E 4MATIC, 300 E 2.6, 300 CE, 300 TE and 300 TE 4MATIC
- W126 Series: 260 SE, 300 SE and 300 SEL
- W129 Series: 300 SL
- W201 Series: 190 E 2.6
- W463 Series: 300 GE
Important: this edition brings together procedures and technical data applicable to engines 103.940, 103.942, 103.981, 103.982, 103.983 and 103.985. The original manual is written in English and may also serve as a reference for other vehicles equipped with Mercedes-Benz M103 variants of comparable configuration.
This digital PDF version includes bookmarks for chapter navigation and preserves the technical content of the original printed edition, with the added advantage of instant download. It can be viewed on PC, tablet or smartphone, and allows you to print only the pages needed for the job.
Product details
- Format: PDF
- Language: English
- Pages: 468
- File size: 27.3 MB
- Delivery method: Download link
Frequently asked questions about the Mercedes-Benz M103 engine manual
What makes this M103 manual useful for workshop reference?
It brings together factory service procedures, technical specifications, diagnostic information and repair operations for the Mercedes-Benz M103 inline-six engine, making it useful for maintenance, restoration and more detailed mechanical work.
Which technical references are included in this edition?
It includes service procedures and data for Mercedes-Benz engines 103.940, 103.942, 103.981, 103.982, 103.983 and 103.985, along with useful information that may also serve as a reference for other M103 variants with similar configuration.
Does the manual include repair and maintenance procedures?
Yes. It includes instructions for disassembly, inspection, adjustment, assembly, diagnostics, component replacement and workshop technical specifications.
Is the Mercedes-Benz M103 manual download instant?
Yes. Once the purchase is completed, the manual is delivered in PDF format via digital download link.
Mercedes-Benz M103 Engine Manual | Full Index
This index lists the main sections and job numbers included in the Mercedes-Benz Service Manual Engine 103.
Each entry is listed in accordance with the manual’s original technical layout and numbering.
00 General, technical data
- 00-005 Instructions for use of service manual
- 00-010 Engine and vehicle identification
- 00-015 Vehicle identification number locations
- 00-020 Technical data
01 Crankcase and cylinder head
- 01-008 Opening hood, setting vertical, warnings
- 01-010 Testing compression pressure
- 01-015 Testing cylinders for leaks
- 01-030 Draining, replacing engine (oil capacities)
- 01-140 Replacing freeze plug in engine block
- 01-210 Removing, installing timing cover
- 01-212 Removing, installing top front cover
- 01-222 Removing, installing rear main seal cover
- 01-310 Removing, installing oil sump or front axle housing (4MATIC)
- 01-415 Removing, installing cylinder head
03 Crankshaft assembly
- 03-310 Checking, renewing and tightening conrod bolts
- 03-324 Renewing front crankshaft radial seal
- 03-327 Renewing rear crankshaft radial seal
- 03-342 Removing, installing belt pulley, flywheel damper and hub
- 03-410 Removing, installing flywheel or driven plate
- 03-420 Machining flywheel
05 Engine timing, valves
- 05-220 Removing, installing camshaft
- 05-250 Removing, installing valve springs
- 05-270 Renewing valve stem seals
- 05-310 Removing, installing chain tensioner
- 05-320 Renewing timing chain
- 05-330 Removing, installing tensioning rail
- 05-335 Removing, installing guide rail
- 05-460 Removing, installing crankshaft gear
07.3 Mechanically/electronically controlled gasoline injection system (CIS-E)
- 07.3-100 Checking idling speed, readjusting or special emission test (ASU)
- 07.3-110 Testing, regulating engine
- 07.3-111 Performing cylinder comparison test with engine tester SUN 2110
- 07.3-112 Testing electronic idling speed control
- 07.3-115 Testing engine output and emissions on drum dynamometer
- 07.3-117 Determining fuel consumption by driving on road
- 07.3-120 Checking fuel pressures and for internal leaks
- 07.3-121 Testing electrical components of CIS-E injection system
- A. Without trouble diagnosis by means of on-off ratio
- B. With trouble diagnosis by means of on-off ratio
- 07.3-122 Testing throttle (orifice) in fuel distributor for unobstructed passage
- 07.3-125 Testing starting unit
- 07.3-126 Testing starting valve activation
- 07.3-127 Performing cold start
- 07.3-128 Electric wiring diagrams
- 07.3-130 Testing fuel pump
- A. Delivery capacity
- B. Fuel pressure
- 07.3-135 Testing injection valves
- 07.3-152 Testing, replacing throttle valve switch
- 07.3-160 Perform fuel quantity comparison measurement
- 07.3-165 Testing relay fuel pump
- 07.3-200 Removal and installation of mixture control unit
- 07.3-205 Replacing fuel distributor
- 07.3-207 Replacing sealing ring for control piston
- 07.3-215 Removal and installation of injection valves
- 07.3-220 Replacing air volume meter
- 07.3-225 Removal and installation of mixture control unit with air guide housing
- 07.3-230 Removal and installation of throttle valve housing
- 07.3-245 Replacing, centering air flow sensor plate, testing and adjusting zero position of air flow sensor plate
- 07.3-250 Removal and installation of control unit
- 07.3-255 Replacing electrohydraulic actuator (EHA)
- 07.3-268 Replacing rubber rings or rubber buffers for fuel pump package
- 07.3-269 Removal and installation of fuel pump package
- 07.3-270 Removal and installation of fuel accumulator
- 07.3-275 Removal and installation of fuel filter
- 07.3-280 Removal and installation of fuel pump
09 Air cleaner
- 09-400 Removal and installation of air cleaner
- 09-402 Renewing of intake scoop
13 Belt drive
- 13-342 Checking condition of poly V-belt and renewing
- 13-345 Removing, installing tensioning device
14 Intake manifold, exhaust manifold
- 14-001 Distinguishing features of vehicles with exhaust emission control system
- 14-050 Function of emission control system
- 14-116 Checking oxygen sensor failure indication USA
- 14-450 Removal and installation of intake manifold, replacement of gasket
- 14-455 Renewal of intake manifold (intake manifold removed)
- 14-470 Removal and installation of exhaust manifold
- 14-480 Renewal of oxygen sensor
15 Electrical system, engine
- 15-505 Notes regarding jobs on breakerless transistorised ignition system
- 15-510 Function of the electronic ignition system with variable characteristics (EZL)
- 15-515 Checking ignition timing
- 15-525 Evaluation of oscilloscope image
- 15-530 Renewing spark plugs
- 15-535 Removal and installation of high-voltage distributor
- 15-540 Checking the electronic ignition system with variable characteristics (EZL)
18 Engine lubrication
- 18-002 Engine oil and filter change
- 18-110 Removing, installing oil filter
- 18-210 Removing, installing oil pump
- 18-212 Renewing oil pump chain
- 18-215 Removing, installing oil pressure relief valve in oil pump
- 18-330 Removing, installing oil level sensor
- 18-415 Renewing oil level return lock
20 Engine cooling
- 20-010 Draining, pouring in coolant - Antifreeze protection table
- 20-017 Testing cooling system for leaks
- 20-110 Removing, installing coolant thermostat
- 20-210 Removing, installing coolant pump
- 20-312 Removing, installing viscous fan clutch
- 20-420 Removing, installing radiator
- 20-450 Removing, installing overflow tank
22 Engine suspension
- 22-211 Removing, installing front engine mounts
- 22-212 Removing, installing rear engine mounts
- 22-213 Rear engine mount (Freeway hop) Model 124 USA
- 22-220 Setting engine stop, Model 124 4MATIC
30 Throttle control
- 30-300 Adjusting control linkage
- 30-315 Removal and installation of accelerator pedal with front wall mounting
- 30-325 Removal, installation and adjustment of Bowden cable
47 Fuel system
- 47-010 Operation of fuel tank with surge bowl
- 47-020 Operation of fuel gage pickup
- 47-030 Operation of fuel tank positive and negative ventilation
- 47-100 Removal and installation of fuel tank
- 47-120 Removal and installation of fuel gage pickup
- 47-200 Function of fuel evaporation system
- 47-300 Checking the fuel evaporation system
- 47-400 Function of fuel cooler
49 Exhaust system
- 49-100 Removal, installation of exhaust system
Mercedes-Benz M103 Engine Manual | Cover