Mercedes M103 Petrol Engine Manuals

The Mercedes-Benz M103 is a straight inline 6-cylinder petrol engine with displacement versions of 2.6L (2,597 cc), 3.0L (2,960 cc) and 3.2L AMG, produced from 1984 to 1997

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Download: Mercedes Benz M103 2.6L 3.0L Engine Service Manual

Download Mercedes M103 Engine Manual
Applications: R107, W124, W126, W201
Format: Bookmarked .pdf Document
Download: 48.8mb, 461 pages, .pdf

USD $19.95

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Download: M103 2.6L 3.0L 3.2L Concise Edition Service Manual

Mercedes M103 2.6 3.0 3.2 Engine Manual
Applications: R107, W124, W126, R129, W201, W463
Format: Bookmarked .pdf Document
Download: 95.2 mb, 872 pages, .pdf

USD $24.95

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M103 Engine Technical Data

The M103 is a straight-6 with 15 degree inclination to the right, single overhead cam with 2 valves per cylinder, and was replaced by the M104 starting in 1989.

The M103 was designed for replacing the M110 engine and has a unified design with the 4-cylinder M102. Two variants include the M103 2.6-liter E26 engine, and larger bore M103 3.0-liter E30 engine which was used for the AMG 3.2-liter version..

Features include a lightweight cast iron cylinder block, aluminum cylinder head with two valves per cylinder (intake 43 mm, exhaust 39 mm), a single overhead camshaft (SOHC) and hydraulic lifters/tappets.

These M103 engines applied mechanical fuel injection, (KE-Jetronic).

M103 Engine Application Survey

M103 2.6 L

The smaller M103 engine:103.940 2.6 L; 158.5 cu in (2,597 cc) produces 124 kW (169 PS; 166 hp) at 5800 rpm and torque of 228 Nm (168 lbft) at 4600 rpm "without catalyst". It uses the CIS-E engine management system and has a bore and stroke of 82.9 mm × 80.2 mm (3.26 in × 3.16 in). It was used in the W201 (190), W124 E-Class and W126 S-Class.

M103 3.0 L

The Larger bore M103 engine: 103.980 3.0 L; 180.6 cu in (2,960 cc) produces 140 kW (190 PS; 188 hp) at 5700 rpm and torque of  260 Nm (192 lbft) at 4400 rpm "without catalyst". It uses the CIS-E (Electronic Continuous Injection System) and has a compression ratio of 9.2:1 with bore and a stroke of 88.5 mm × 80.2 mm (3.48 in × 3.16 in) and redlines at 6200 rpm. It was used in the W124 E-Class, W126 S-Class, R129, W463 G-Class and R107.

M103 3.2 L

The M103 3.0L was modified by AMG for high performance with a 3.2 Liter overbore, longer stroke, stroker crankshaft,  hydraulic-lifter cylinder head with solid lifters and more aggressive cam. The W201 190 E 3.2 AMG engine generated a maximum power output of 231 hp (172 kW; 234 PS), and enabled the car to attain a top speed of 243 km/h (151 mph). Another application is the 1988-1989 W124 230TE AMG.

The M103 3.6-liter Brabus high performance modified engine was claimed to produce approximately 300 horsepower and 270 lb-ft of torque.

Production and Application Statistics