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Mercedes-Benz Service Manual Engine M115
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Workshop manual for Mercedes-Benz M115 4-cylinder inline engines, 2.3 liters.
Includes factory technical information for the diagnosis, disassembly, inspection, adjustment and repair of engines 115.951 and 115.954, with content applicable to Mercedes-Benz vehicles from the W115 and W123 series.
PDF in English | 518 pages | Instant download.
- Complete engine technical manual
- Factory service data and specifications
- Procedures with tables, diagrams and illustrations
- Useful for repair, maintenance and restoration
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Mercedes-Benz Service Manual Engines M 115 | PDF
Workshop manual for the Mercedes-Benz M115 4-cylinder inline 2.3-liter engine.
The Mercedes-Benz M115 was one of the brand’s most widely used gasoline four-cylinder engines during the 1970s and early 1980s. In its 2.3-liter versions, it combined an overhead camshaft design, carbureted fuel delivery, and a robust mechanical layout intended to provide dependable service, relatively accessible maintenance, and long service life. For that reason, it remains a highly consulted engine for repair, tuning, restoration, and preservation work on classic Mercedes-Benz vehicles.
This digital PDF edition brings together factory technical information for diagnosis, disassembly, inspection, measurement, adjustment, assembly, and component replacement on engines 115.951 and 115.954, which are the engine references covered directly in the manual. The content includes both service specifications and step-by-step procedures, making it useful for mechanics, restorers, and owners looking for more complete technical documentation than a basic maintenance guide.
Although this manual is centered on the versions installed in W115 and W123 passenger cars, the M115 family was also used in other Mercedes-Benz applications, including certain utility vehicles, vans, and off-road models. That is precisely why it can also serve as a complementary reference when comparing mechanical solutions within the same engine family, always bearing in mind that the direct coverage of this edition corresponds to the engines listed above.
If you want to check the scope of the content more precisely before buying, you can also review the Full index tab, where the chapters and operations included in this edition are listed.
Main contents of the Mercedes-Benz M115 manual
- Technical data and service specifications
- General engine checks
- Engine block and cylinder head
- Crankshaft, pistons, and cylinders
- Timing system, valves, and adjustments
- Carburetor and related adjustments
- Emission control system
- Air filter and intake air preheating
- Lubrication system
- Cooling system
- Engine electrical system
- Fuel system, throttle linkage, and exhaust
- Belts, pulleys, and auxiliary components
- Engine mounts and related components
Applications related to the 2.3-liter M115 engine
- W115 series: 230.4
- W123 series: 230, 230 C, and 230 T
Other 2.3-liter M115 family applications in Mercedes-Benz utility vehicles, vans, and off-road models
- W460 series: 230 G
- L409 series: 409 (in some versions)
Models that used 2.0- and 2.2-liter M115 engines
- W115 series: 200 and 220
- W123 series: 200
Important compatibility note: this manual directly covers Mercedes-Benz engines 115.951 and 115.954. Although the W460 230 G, as well as some L409 versions, belong to the 2.3-liter M115 family, they correspond to a different engine variant, so their mention should be understood only as a general family reference and not as specific coverage of this edition. Before purchasing, the safest verification is always the exact engine code installed in the vehicle.
The file is delivered in PDF format and preserves the technical approach of the original workshop material. It can be viewed on a computer, tablet, or smartphone, and also allows you to print only the pages needed to work on the vehicle without having to use the entire document.
Product features
- Format: PDF
- Language: English
- Pages: 518
- Delivery: Digital download
Frequently asked questions about this Mercedes-Benz M115 manual
Does this file cover every M115 engine?
No. This edition directly covers engines 115.951 and 115.954. It may serve as a complementary reference for other M115 family variants, but the specific coverage of the manual is limited to those two engine references.
Is it useful for the Mercedes-Benz W460 230 G?
Only as general support. The 230 G belongs to the M115 family, but it uses a different engine variant, so this PDF should not be interpreted as a model-specific manual for that application.
Does it include measurement values, tolerances, and adjustment data?
Yes. The manual includes service data and inspection procedures useful for checking wear, adjusting components, and comparing measurements during a repair.
Does it include information on the carburetor and engine auxiliary systems?
Yes. The subjects covered include the carburetor, emission control, air filter, intake, lubrication, cooling, engine electrical system, fuel system, and exhaust.
Is it useful only for a full rebuild, or also for maintenance and tuning?
It is useful for both. It can be used for major engine work as well as for diagnosis, adjustment, inspection, and more specific technical maintenance tasks.
What advantage does it have over a condensed guide?
Because it is a factory service manual, it offers a much higher level of detail in procedures, inspections, and working criteria, which is especially valuable for restorations or repairs carried out with originality in mind.
Mercedes-Benz M115 engine manual | Index
This index lists the main sections and job numbers included in the Mercedes-Benz Service Manual Engine 102.
Entries are presented according to the original technical structure and numbering of the manual.
00 General, technical data
- 00-015 Vehicle identification number locations
- 00-020 Technical data
01 Crankcase and cylinder head
- 01-010 Checking compression pressure
- 01-015 Checking cylinders for leaks
- 01-020 Evaluating cylinders bores
- 01-030 Removal and installation of engine (oil filling capacity)
- 01-040 Engine breather - functional description
- 01-110 Measuring, boring and honing cylinder bores
- 01-120 Facing cylinder crankcase parting surface
- 01-130 Knocking out and inserting steel balls for main oil ducts
- 01-140 Replacing core hole closing cover in cylinder crankcase
- 01-220 Installation and centering of intermediate flange
- 01-310 Removal and installation of complete oil pan
- 01-415 Removal and installation of cylinder head
- 01-418 Facing cylinder head parting surface
- 01-420 Pressure-testing cylinder head
03 Crankshaft assembly
- 03-310 Checking, renewing and tightening connecting rod bolts
- 03-313 Reconditioning and squaring connecting rod
- 03-316 Removal and installation of pistons
- 03-318 Checking and reconditioning of crankshaft
- 03-320 Mountng of crankshaft
- 03-324 Renewing front crankshaft radial sealing ring
- 03-327 Renewing rear crankshaft radial sealing ring
- 03-330 Removal and installation of radial ball bearing and closing ring in crankshaft
- 03-343 Removal and installation of pulley and balancing disc
- 03-344 Static balancing of balancing disc
- 03-345 Checking and correcting adjustment of TDC transmitter
- 03-350 Removal and installation of crankshaft sprocket
- 03-410 Removing and installing flywheel and driven plate
- 03-420 Refinishing flywheel
- 03-430 Renewing ring gear of flywheel
- 03-440 Static balancing of flywheel
05 Engine timing, valve train
- 05-210 Inspection and adjustment of valve clearance
- 05-212 Renewal of threaded bushing with valve adjusting screw
- 05-215 Inspection and correction of camshaft timing
- 05-220 Removal and installation of camshaft
- 05-225 Grinding camshaft bearing journals
- 05-230 Removal and installation of rocker arms
- 05-250 Removal and installation of valve springs
- 05-260 Checking valve springs
- 05-270 Replacement of valve stem seals
- 05-280 Checking and machining valves
- 05-285 Inspection and renewal of valve guides
- 05-290 Renewal of valve seat rings
- 05-291 Machining valve seats
- 05-310 Removal and installation of chain tensioner
- 05-320 Renewing timing chain
- 05-330 Removal and installation of tensioning rail
- 05-340 Removal and installation of slide rails
- 05-410 Removal and installation of helical gear shaft
- 05-412 Removal and installation of intermediate gear shaft
- 05-432 Removal and installation of intermediate sprocket
07_2 Caburetor, fuel pump
- 07_2-090 Layout and operation of Stromberg carburetor standard version
- 07_2-096 (USA) model year 1974-1976
- 07_2-100 Adjusting idle speed
- 07_2-102 Checking idle speed shutoff valve
- 07_2-104 Removal and installation of idle speed shutoff valve
- 07_2-105 Checking, correcting basic adjustment of throttle valve
- 07_2-107 Checking, correcting basis adjustment of fuel adjusting screw (national vesrion only)
- 07_2-110 Checking, regulating engine
- 07_2-125 Checking, adjusting choke
- 07_2-128 Performing cold start
- 07_2-136 Replacing diaphragm for choke
- 07_2-137 Replacing drive lever in choke
- 07_2-140 Removing, checking and installing choke
- 07_2-142 Checking, correcting choke housing mark
- 07_2-149 Subsequent installation of standard choke housing
- 07_2-180 Checking, adjusting float level
- 07_2-182 Checking float chamber venting system (national version only)
- 07_2-186 Checking fuel return valve
- 07_2-190 Cleaning, adjusting carburetor
- 07_2-194 Removal and installation of carburetor
- 07_2-195 Removal and installation of air piston, air piston diaphragm and nozzle needle
- 07_2-210 Testing fuel pump
- 07_2-212 Removal and installation of fuel pump
07_6 Emission control system
- 07_6-001 Functional characteristics
- 07_6-050 Operation
- 07_6-100 Test program
- 07_6-200 Removal and installation of catalyst
- 07_6-210 Conversion of exhaust system from national to tourist version
- 07_6-250 Removal and installation of air pump
09 Air cleaner, intake air preheater
- 09-400 Operation of intake air preheater
- 09-401 Checking preheating of intake air
- 09-405 Removal and installation of thermostat or temperature regulator for preheating intake air
- 09-410 Removal and installation or air cleaner
- 09-412 Subsequent installation of cyclonic air cleaner
13 Belt drive
- 13-335 Instructions concerning replacing and tensioning of V-velts
- 13-340 Replacing and tensioning of V-belts
14 Intake manifold, exhaust manifold
- 14-415 Removal and installation of intake manifold
- 14-418 Removal and installation of heater flap bearings
- 14-450 Removal and installation of exhaust manifold
15 Electrical system, engine
- 15-500 Testing and adjusting dwell angle and firing point (contact-controlled ignition system)
- 15-501 Testing and adjusting firing point (breakerless transistorized ignition)
- 15-503 Formation of deposit on breaker contact points (contact-controlled transistorized ignition system)
- 15-505 Replacing contact breaker points
- 15-510 Removal and installation of ignition distributor
- 15-515 Testing normal coil ignition
- 15-519 General description of contact-controlled transistorized ignition system
- 15-528 Information concerning jobs on breakerless transistorized ignition system
- 15-530 General description of breakerless transistorized coil ignition system TSZ 4
- 15-561 Testing contact-controlled transistorized coil ignition system TSZ 4 (J) (USA)
- 15-562 Testing breakerless transistorized coil ignition system TSZ 4 (J) USA)
- 15-570 Subsequent installation of temperature-controlled ignition switchover
18 Engine lubrication, oil cooler
- 18-005 Oil circuit, oil pressure, presure relief valve and oil filter
- 18-025 Measuring oil consumption
- 18-110 Removal and installation of oil filter
- 18-210 Removal and installation of oil pump
20 Engine cooler system
- 20-005 Coolant circuit and engine cooling
- 20-010 Draining and filling-in of coolant - anti-freeze table
- 20-015 Cleaning the cooling system
- 20-210 Removal and installation of coolent pump
- 20-220 Reconditioning of coolant pump
- 20-225 Sealing of coolant pump
- 20-230 Removal and installation of coolant pump housing
- 20-420 Removal and installation of radiator
- 20-425 Repairing radiator
- 20-430 Testing radiator cap
22 Engine suspension
- 22-210 Removal and installation of engine mount
- 22-215 Removal and installation of front engine stop
- 22-220 Adjustment of engine stop
- 22-240 Removal and installaton of engine shock absorber
- 22-241 Subsequent installation of engine shock absorber
30 Throttle control
- 30-300 Adjusting regulating linkage
- 30-320 Removal and installation of front wall regulating shaft
- 30-330 Removal and installation of accelerator pedal
47 Fuel system
- 47-700 Removal and installation of fuel tank
- 47-705 Removal and installation of fuel expansion tank
- 47-710 Removal and installation of immersion tube transmitter
- 47-715 Functional description of immersion tube transmitter for fuel gage
- 47-720 Functional description of fuel tank positive and negative venting system
- 47-800 Fuel evaporation control system (AUS) (J) (USA)
49 Exhaust system
- 49-100 Removal and installation of exhaust system
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Workshop manual for Mercedes-Benz M115 4-cylinder inline engines, 2.3 liters.
Includes factory technical information for the diagnosis, disassembly, inspection, adjustment and repair of engines 115.951 and 115.954, with content applicable to Mercedes-Benz vehicles from the W115 and W123 series.
PDF in English | 518 pages | Instant download.
- Complete engine technical manual
- Factory service data and specifications
- Procedures with tables, diagrams and illustrations
- Useful for repair, maintenance and restoration