Mercedes-Benz Engine M104 | Manual cover
  • Mercedes-Benz Engine M104 | Manual cover
  • Mercedes-Benz Engine M104 | Function of camshaft adjuster
  • Mercedes-Benz Engine M104 | Removing and installing starting valve
  • Mercedes-Benz Engine M104 | Replacing spark plugs
  • Mercedes-Benz Engine M104 | Removing and installing Bowden cable

Mercedes-Benz Service Manual Engine 104

$20.00

Workshop manual for the Mercedes-Benz M104 inline 6-cylinder engine, with applications in 2.8, 3.0, 3.2, 3.4 AMG and 3.6-liter versions.

Includes factory technical information for engine diagnosis, inspection, disassembly, adjustment and repair, with content applicable to Mercedes-Benz vehicles in the W124, W129, W140, W202, W210 and W463 series.

PDF in English | 651 pages | Instant download.

  • Factory technical data and specifications
  • Inspection, disassembly and adjustment procedures
  • Diagrams and engine service content
  • Useful for repair, maintenance and restoration
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Mercedes-Benz Service Manual Engine 104 | PDF

Workshop manual for the Mercedes-Benz M104 inline 6-cylinder engine, with applications in 2.8, 3.0, 3.2, 3.4 AMG and 3.6-liter versions.

The Mercedes-Benz M104 was introduced in the late 1980s as the evolution of the M103 and became one of the brand’s most representative inline 6-cylinder engines during the 1990s. It featured a 24-valve cylinder head with double overhead camshafts (DOHC) and was used in various Mercedes-Benz sedans, coupes, estates, roadsters and off-road vehicles of the period.

This digital PDF edition was originally conceived as a workshop service manual and includes diagnostic, inspection, disassembly, adjustment, repair and parts replacement procedures for engines 104.941, 104.942, 104.943, 104.944, 104.945, 104.980, 104.981, 104.990, 104.991, 104.992, 104.994, 104.995 and 104.996.

To review the scope of the contents and included operations in greater detail, please also check the Full Index tab.

Main topics covered in the Mercedes-Benz M104 engine manual

  • General engine data and technical specifications
  • Crankcase, cylinder head, oil sump and crankcase ventilation
  • Crankshaft, connecting rods, pistons, piston rings and seals
  • Timing system, camshafts, valves, timing chain and tensioner
  • Gasoline injection system (CIS-E) and injection valves
  • Air cleaner, Poly-V belt, intake and exhaust
  • Engine electrical system, ignition, sensors and control units
  • Lubrication, oil pump, oil level system and heat exchangers
  • Cooling system, thermostat, water pump, radiator and viscous fan clutch
  • Engine mounts, throttle control and fuel system
  • Exhaust system and related auxiliary components

Mercedes-Benz vehicles fitted with the M104 engine

  • W124 series: 300 E-24, 300 CE-24, 300 TE-24, E 280, E 320, E 36 AMG and 3.4 AMG variants.
  • R129 series: 300 SL-24, SL 280 and SL 320.
  • W140 series: 300 SE 2.8, 300 SE 3.2, 300 SEL 3.2, S 280 and S 320.
  • W202 series: C 280 and C 36 AMG.
  • W210 series: E 280 and E 320.
  • W463 series: 320 GE and G320 in its early versions.

Important: this list is intended as a general reference and summarizes the applications shown in the manual’s Engine and model survey table. Depending on year, market or body style, model designations may vary, so the safest reference remains the exact engine code before purchase.

This digital edition preserves the technical approach of the original manual and is useful not only for workshops, but also for restorers, experienced mechanics and enthusiasts who need to consult specific procedures without relying on a full printed copy.

Product details:

  • Format: PDF
  • Language: English
  • Pages: 651
  • File size: 43.6 MB
  • Delivery method: Download link

Frequently asked questions about the Mercedes-Benz M104 engine manual

Does this manual cover one specific M104 engine or several versions?

This edition brings together service information for different Mercedes-Benz M104 variants. Engine codes shown in the manual include 104.941, 104.942, 104.943, 104.944, 104.945, 104.980, 104.981, 104.990, 104.991, 104.992, 104.994, 104.995 and 104.996, so it is always advisable to check your exact engine code before buying.

Does this edition preserve the original technical terminology?

Yes. The manual follows the original Mercedes-Benz technical wording and workshop job numbering, which helps keep procedures and references consistent with the source document.

What kind of technical information is included in this edition?

The content is focused on engine diagnosis, inspection, disassembly, adjustment and repair. It also covers technical groups such as general data, crankcase and cylinder head, crankshaft assembly, timing and valves, CIS-E injection system, intake, exhaust, engine electrical system, lubrication, cooling, engine mounts, throttle control and fuel system.

Can I use it to check whether my AMG version is covered?

Yes, the manual includes M104 applications used in AMG versions within the general engine coverage, including 3.4 AMG and 3.6 AMG variants. However, it is not presented as a separate AMG manual, but as a technical Engine 104 edition covering different applications by code and model.

Which Mercedes-Benz vehicles used this engine?

The manual’s application table includes M104 versions fitted in the W124, R129, W140, W202, W210 and W463 series. Commercial model names may vary depending on market, body style or year, which is why the engine code remains the safest reference.

Is this PDF only useful for professional workshops?

It was originally intended as a service manual for technical use, but it can also be very useful for restorers, advanced enthusiasts and owners who want to review the scope of the contents, identify components or better understand M104 maintenance and repair procedures.

Mercedes-Benz M104 Engine Manual | Full Index

This index lists the main sections and job numbers included in the Mercedes-Benz Service Manual Engine 104.

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

01 Crankcase and cylinder head

  • 01-0010 Engine and model survey
  • 01-0085 Warning instructions when hood open
  • 01-0100 Testing compression pressure
  • 01-0110 Cranking engine with starter
  • 01-0120 Cranking engine at front of crankshaft
  • 01-0150 Testing cylinders for leaks
  • 01-0200 Inspecting cylinders with inspection lamp, assessing
  • 01-0300 Removing and installing engine
  • 01-0310 Disconnecting and connecting engine wiring harness
  • 01-0400 Function description of crankcase ventilation
  • 01-0420 Removing and installing engine air admission housing (combination support)
  • 01-0430 Oil drain pipe bottom of crankcase, arrangement
  • 01-0500 Removing and installing cylinder head cover
  • 01-1000 Notes regarding crankcase
  • 01-1020 Dimensions for pressing in straight pins in crankcase
  • 01-1100 Measuring, boring and honing cylinder bores
  • 01-1200 Facing contact surface of crankcase
  • 01-1220 Repairing threaded bores for cylinder head bolts
  • 01-1300 Cleaning, sealing main oil galleries
  • 01-1400 Replacing coreplugs in crankcase
  • 01-2100 Removing and installing timing case cover
  • 01-2120 Removing and installing front cover at top
  • 01-2140 Replacing radial shaft sealin front cover at top
  • 01-2220 Removing and installing end cover
  • 01-2240 Checking for leaks at rear of engine
  • 01-3100 Removing and installing oil sump
  • 01-4050 Examining, tightening cylinder head bolts
  • 01-4070 Repairing spark plug threads
  • 01-4150 Removing and installing cylinder head
  • 01-4180 Examining, facing contact surface of cylinder head
  • 01-4190 Widening camshaft bearing bores (repair size)
  • 01-4192 Servicing threads for camshaft bearing cap bolts
  • 01-4300 Cleaning, sealing oil longitudinal galleries in cylinder head
  • 01-4400 Sealing air galleryin cylinder head

03 Crankshaft assembly

  • 03-1800 Removing and installing crankshaft
  • 03-3100 Checking, replacing and tightening conrod bolts
  • 03-3130 Servicing, aligning and mounting conrod bearings
  • 03-3160 Removing and installing pistons
  • 03-3165 Matching pistons and piston dimensions
  • 03-3170 Replacing piston rings
  • 03-3180 Examining and repairing crankshaft
  • 03-3190 Crankshaft machining deimensions and identifications
  • 03-3200 Measuring crankshaft, fitting new bearings
  • 03-3240 Replacing front crankshaft radial seal
  • 03-3270 Replacing rear crankshaft radial seal
  • 03-3420 Removing and installing belt pulley/vibration damper
  • 03-3422 Arrangement of belt pulley/vibration damper
  • 03-3450 Checking, correcting setting of TDC sensor
  • 03-4100 Removing and installing driven plate ring gear
  • 03-4600 Function of two-mass flywheel
  • 03-4620 Removing and installing two-mass flywheel
  • 03-4640 Removing and installing needle bush in two-mass flywheel
  • 03-5000 Removing and installing lock for crankshaft/ring gear

05 Engine timing, valves

  • 05-2160 Function of camshaft adjuster
  • 05-2170 Removing and installing camshaft adjuster
  • 05-2175 Armature and servo magnet at camshaft adjuster
  • 05-2178 Removing and installing follower at camshaft
  • 05-2180 Matching bolts to camshaft
  • 05-2190 Matching camshaft adjuster parts
  • 05-2200 Removing and installing camshaft
  • 05-2210 Matching camshaft and mounting
  • 05-2218 Replacing threaded bush in front of camshaft
  • 05-2220 Replacing end cover in camshafts
  • 05-2230 Checking basic position of camshafts
  • 05-2240 Adjusting basic position of camshafts
  • 05-2500 Removing and installing valve springs
  • 05-2600 Examining valve springs
  • 05-2700 Replacing valve stem seals
  • 05-2845 Checking valve guides
  • 05-2850 Replacing valve guides
  • 05-2900 Replacing valve seat rings
  • 05-2910 Machining valve seat rings
  • 05-3100 Removing and installing chain tensioner
  • 05-3200 Replacing and riveting timing chain
  • 05-3300 Removing and installing tensioning rail
  • 05-3350 Removing and installing guide rail in crankcase
  • 05-3360 Removing and installing friction rail in crankcase
  • 05-3400 Removing and installing guide rail in cylinder head
  • 05-4400 Removing and installing guide sprocket, engine 104.98
  • 05-4600 Removing and installing crankshaft sprocket

07.3 Mechanically/Electronically gasoline injection system (CIS-E)

  • 07.3-0001 Model designation, installation survey
  • 07.3-0005 Location of components
  • 07.3-1616 Removing and installing starting valve
  • 07.3-1609 Performing fuel quantity comparison measurement
  • 07.3-1612 Checking, adjusting zero position of air flow sensor plate
  • 07.3-1652 Removing and installing CIS-E resistande trimming plug
  • 07.3-1660 Replacing seal for control plunger
  • 07.3-1665 Removing and installing air flow sensor plate
  • 07.3-1668 Removing and installing mixture control unit
  • 07.3-1669 Removing and installing diaphragm pressure regulator
  • 07.3-1674 Removing and installing fuel distributor
  • 07.3-1683 Removing and installing fuel accumulator
  • 07.3-1686 Removing and installing air flow sensor
  • 07.3-1687 Removing and installing coolant temperature sensor
  • 07.3-1688 Removing and installing overvoltage protection
  • 07.3-1689 Removing and installing throttle valve switch
  • 07.3-1690 Removing and installing microswitch
  • 07.3-1691 Removing and installing intake air temperature sensor
  • 07.3-1692 Replacing electrohydraulic actuator
  • 07.3-1693 Replacing vehicle speed Hall-effect sensor
  • 07.3-1698 Removing and installing CIS-E control unit
  • 07.3-2118 Removing and installing idle speed motor
  • 07.3-5303 Replacing oxygen sensor
  • 07.3-5563 Removing and installing fuel filter
  • 07.3-5713 Removing and installing fuel pumps
  • 07.3-5770 Removing and installing fuel pump set
  • 07.3-5820 Replacing check valve for fuel pump
  • 07.3-5860 Removing and installing rubber pads for fuel pump set
  • 07.3-6210 Removing and installing throttle valve housing
  • 07.3-6500 Testing injection valves
  • 07.3-6520 Removing and installing injection valves

09 Air cleaner

  • 09-0015 Removing and installing air cleaner
  • 09-0060 Removing and installing air scoop

13 Belt drive

  • 13-1200 Removing and installing poly V-belt
  • 13-1230 Checking poly V-belt, typical types of damage
  • 13-1240 Poly V-belt, running diagrams, dimensions
  • 13-3200 Removing and installing tensioning device
  • 13-3250 Removing and installing belt pulley of tensioning device (2nd version)
  • 13-4000 Removing and installing schock absorber of tensioning device
  • 13-4200 Removing ans installing carrier of air pump/generator, models 202, 210

14 Intake manifold, exhaust manifold

  • 14-1310 Removing and installing intake manifold, replacing gasket
  • 14-1346 Replacing intake manifold (intake manifold removed)
  • 14-3915 Removing and installing exhaust manifold
  • 14-7251 Removing and installing air pump
  • 14-7264 Removing ain installing electromagnetic clutch
  • 14-7305 Removing and installing air pump switchover valve
  • 14-7662 Removing and installing exhaust gas recirculation valve
  • 14-7692 Removing and installing exhaust gas recirculation switchover valve

15 Electrical system, engine

  • 15-0512 Replacing ignition cables with M3 cable screw
  • 15-1031 Replacing spark plugs
  • 15-2001 Removing and installing ignition coil
  • 15-2093 Removing and installing EZL/AKR control unit
  • 15-2133 Removing and installing crankshaft position sensor
  • 15-2143 Removing and installing camshaft position sensor
  • 15-2153 Removing and installing EZL/AKR trimming plug connector
  • 15-2183 Replacing knock sensors
  • 15-2193 Removing and installing engine systems control unit (MAS)
  • 15-3010 Removing and installing high voltage distributor

18 Engine lubrication

  • 18-0020 Changing engine oil and filter
  • 18-0050 Oil circuit
  • 18-0070 Testing oil pressure
  • 18-0090 Operation of oil pressure gauge
  • 18-0250 Measuring oil consumption
  • 18-1000 Operation of oil filter
  • 18-1100 Removing and installing oil filter
  • 18-1120 Removing and installing oil pipes (oil filter - air-to-oil cooler)
  • 18-1300 Removing and installing air-to-oil cooler
  • 18-1320 Removing and installing oil-to-coolant heat exchanger
  • 18-1370 Pressure-testing oil-to-coolant heat exchanger
  • 18-2100 Removing and installing oil pump
  • 18-2120 Replacing and riveting oil pump chain
  • 18-2150 Removing and installing oil pressure relief valve in oil pump
  • 18-2180 Removing and installing oil shield at crankshaft
  • 18-3100 Function of electrical oil level indicator
  • 18-3300 Removing and installing oil level sensor
  • 18-3320 Testing oil level sensor
  • 18-3500 Checking dipstick and guide tube
  • 18-3510 Removing and installing dipstick guide tube, model 202
  • 18-4000 Removing and installing oil spray nozzles for pistons
  • 18-4100 Removing and installing oil spray nozle for timing chain, engine 104.94/99
  • 18-4150 Replacing oil non-return valve of chain tensioner

20 Engine cooling

  • 20-0020 Switching points in cooling system
  • 20-0050 Coolant circuit
  • 20-0060 Operation of engine off cooling
  • 20-0100 Draining, pouring in coolant - anti-freeze protection table
  • 20-0150 Flushing cooling and heating system
  • 20-0160 Removing oil cooling and heating system
  • 20-0170 Testing cooling system for leaks
  • 20-1000 Removing and installing coolant fitting at front cover
  • 20-1100 Removing and installing coolant thermostat
  • 20-2100 Removing and installing coolant pump
  • 20-2110 Replacing connection pipe from cylinder head coolant pump
  • 20-2250 Sealing coolant pump
  • 20-2255 Retrofitting coolant pump drain pipe
  • 20-2300 Removing and installing coolant pipe from heat exchanger to coolant pump
  • 20-3100 Temperature-controlled viscous fan clutch
  • 20-3120 Removing and installing viscous fan clutch
  • 20-3140 Removing and installing bearing bracket of viscous fan clutch
  • 20-3400 Removing and installing, adjusting fan shroud
  • 20-4200 Removing and installing radiator
  • 20-4300 Testing cooling system pressure cap
  • 20-4450 Function of electrical coolant level indicator
  • 20-4500 Removing and installing expansion reservoir
  • 20-4540 Removing and installing overflow reservoir

22 Engine mounts

  • 22-2110 Removing and installing front engine mounts
  • 22-2120 Removing and installing rear engine mount
  • 22-2500 Removing and installing engine carrier

30 Throttle control

  • 30-0012 Removing and installing fire wall pivot point with accelerator lever
  • 30-0025 Removing and installing Bowden cable
  • 30-1010 Adjusting throttle control
  • 30-1156 Removing and installing potentiometer of electronic accelerator pedal
  • 30-1262 Removing and installing actuator of electronic accelerator pedal/Tempomat cruise control
  • 30-1321 Removing and installing accelerator pedal

47 Fuel system

  • 47-4100 Removing and installing fuel tank
  • 47-7000 Removing and installing fuel gauge sending unit
  • 47-7571 Remove and installing guide funnel
  • 47-8212 Removing and installing charcoal canister
  • 47-8252 Removing and installing regeneration switchover valve (fuel evaporation)

49 Exhaust system

  • 49-0045 Removing and installing exhaust system as from flanged connection
  • 49-0048 Replacing center, final slencers
  • 49-0170 Removing and installing catalytic converter/front exhaust system
  • 49-7000 Removing and installing exhaust system completely

Additional sections included in the manual

  • Programmed Repairs Engine 104 Combustion CIS-E Injection
  • Technical Modifications Engine 104 Combustion CIS-E Injection
  • Technical Modifications Engine 104 Mechanical I
  • Technical Modifications Engine 104 Mechanical II
  • Technical Modifications Engine 104 Mechanical III
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