Mercedes Benz Classics: Owners Operation, Service, and Repair Workshop Manuals

Mercedes M115 Engine Service Manual

The Mercedes Benz 2.0 2.3 Liter M115 Engine, Produced: 1968 to 1985


Mercedes Benz M115 – 4 Cylinder Engine Manual

Mercedes Benz M115 Engine ManualMercedes 2.0 2.3 Liter M115  Engine Manual
Download: 47.4mb, flash, .pdf
Applications: W115, W123, W460

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Mercedes Benz M115 EngineThe M115 engine family was a straight-4 automobile engine from Mercedes-Benz in the 1970s. The same engine was produced in several versions with differing volume, compression, and horse power according to its application.

  • M115.920 M115.921 M115.923 M115.924 M115.926 M115.938 M115.939 M115.951 M115.952 M115.954

In June of 1980 a new 2 liter 4-cylinder gasoline engine (Type M102) was introduced to replace the M115, a fuel injected 2.3 litre version of this engine. Both engines were more powerful than their predecessors.M115 Engine Displacement Versions:

2.0 L (1,988 cc)
2.3 L (2,277 cc)
2.3 L (2,307 cc)

Mercedes Benz M115 Engine Service Repair Manual

Mercedes Benz M115 Engine Variants

115.920, 115.921, 115.923, 115.924, 115.926, 115.938, 115.939, 115.951, 115.952, 115.954

Mercedes Benz M115.920 2.2 Liter Engine

The M115.920 is a 2.2 L engine with a power output 103–105 hp (77–78 kW; 104–106 PS)

Applications:

  • 1968-1973 220 (W115.010)

Mercedes Benz M115.921 2.3 Liter Engine

The M115.921 is a 2.3 L 85 hp (63 kW; 86 PS) engine.

Applications:

  • L 408 G

Mercedes Benz M115.923 2.0 Liter Engine

The M115.923 is a 2.0 L (1,988 cc) 70 kW (95 PS; 94 hp) engine.

Applications:

  • 1968-1976 200 (W115.015)

Mercedes Benz M115.924 2.2 Liter Engine

The M115.924 is a 90–120 hp (67–89 kW; 91–122 PS) engine, depending on compression. The 66 kW (90 PS; 89 hp) is 2200 cc.

Applications:

  • 1968-1973 220 (W115 coupé)

Mercedes Benz M115.926 Engine

The M115.926 is an 63–70 kW (86–95 PS; 84–94 hp) engine, depending on compression.

Applications:

  • 1968-1977 220

Mercedes Benz M115.938 2.0 Liter Engine

The M115.938 is a 2.0 L (1,988 cc) engine with a bore and stroke of 87 mm × 83.6 mm (3.43 in × 3.29 in). Power output was 70 kW (95 PS; 94 hp

Applications:

  • 1975-1980 200

Mercedes Benz M115.939 2.0 Liter Engine

The M115.939 is a 2.0-litre 84 hp (63 kW; 85 PS) engine with reduced compression, which follows from a different head. Was e.g. built for export to Switzerland.

Applications:

  • 1976-1980 200

Mercedes Benz M115.951 Engine

The M115.951 is a 110 hp (82 kW; 112 PS) engine.

Applications:

  • 1973-1979 230.4 (W115.017)

Mercedes Benz M115.952 2.3 Liter Engine

The M115.952 is a 2.3 L (2,277 cc) engine with 89 hp (66 kW; 90 PS).

Applications:

  • 409 LF Transporter

Mercedes Benz M115.954 2.3 Liter Engine

The M115.954 is a 2.3 L (2,307 cc) version with a 93.8 mm (3.69 in) bore and the same 83.6 mm (3.29 in) stroke. Power output was 81 kW (110 PS; 109 hp

Applications:

  • 1976-1981 230
  • 1976-1981 230C
  • 1976-1981 230T

Mercedes Benz M115 Engine

The W115 Chassis Fitted M115 Engines

Mercedes 230-Series M115 Engine Specs and Performance

Chassis code Years Model Engine Displacement Type Production
W115.015 1968–1973 200 M115 2.0 L inline 4 175242
W115.615 1973–1976 200 M115 2.0 L inline 4 113543
W115.010 1968–1973 220 M115 2.2 L inline 4 128398
W115.017 1973–1976 230.4 M115 2.3 L inline 4 87609

The W123 Chassis Fitted M115 Engines

Depending on the model and year, Mercedes 230-Series was available with different versions of a 2.3L, inline 4-cylinder engine under the bonnet. From 1976 to 1981, the sedan, estate, and coupe models (230, 230T, and 230C, respectively) came with the M115 engine that delivered 80kW of power at 4,500rpm and 185Nm of torque at 3,000rpm. Post 1981, all three models got the M102 engine.

Both engines were solidly built, as was the rest of the body. The sedan itself weighed 1,360kg, so the Mercedes 230-Series is not a line of light cars. Nevertheless, both the M115 and the M102 engines deliver decent enough power.

Chassis Years Model Engine Power Torque
W123  1977-1978 230 2.0 L M115 I4 93.0 hp (69 kW) @ 4800 125 lb-ft (169 Nm) @ 2500
W123.020 1976–1981 200 2.0 L M115 I4 94 PS (69 kW; 93 hp) @ 4800 158 Nm (117 lb-ft) @ 3000
W123.023 1976–1981 230 2.3 L M115 I4 109 PS (80 kW; 108 hp) @ 4800 185 Nm (136 lb-ft) @ 3000
W123.043 1977–1980 230C 2.3 L M115 I4 109 PS (80 kW; 108 hp) @ 4800 185 Nm (136 lb-ft) @ 3000
W123.083 1978–1980 230T 2.3 L M115 I4 109 PS (80 kW; 108 hp) @ 4800 185 Nm (136 lb-ft) @ 3000