Mercedes OM603 Diesel Engine Manuals

The Mercedes-Benz OM603 6-Cylinder Diesel Engine was produced in displacements of 3.0 Liter (2,996 cc) and 3.4 Liter (3,449 cc) and was manufactured from 1986 to 1997

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Download: Mercedes OM602 OM603 Engine Service Manual

Diesel OM602 OM603 Engine Manual
Download: 78.5mb, 940 pages, .pdf
OM602 Application: W124, W201
OM603 Application: W124, W126

USD $19.95

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Use as reference manual for W460, W461, W463

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Download: Mercedes Benz OM603 Engine Service Manual

Multi Unit: M104, M119, M120, OM603 Engine Manual
Applications: Series W140
Download: 167 mb, 1935 pages,
Format: Bookmarked .pdf Document

USD $19.95

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Download: Mercedes Turbocharged Diesel Injection System Manual

Turbocharged Diesel Engine Injection System
Bosch Injection System Mercedes OM602 OM603
Function, Testing, Adjusting, Repair Manual
Download: 16.9mb, 187 pages, .pdf

USD $12.95

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OM603 Engine Technical Data

The OM603 was a straight-6 diesel motor that was an engineering triumph in pre-chamber design, and a technological leap forward from the earlier 5 cylinder OM617. It produced 148 hp at 4600 rpm with torque of 195 ft.lb at 2400 rpm (euro market without catalytic converter) and had a cylinder bore of 87 mm (3.43 in) with piston stroke of 84 mm (3.31 in) and a compression ratio of 22.0:1. Cylinder block material is cast iron with cylinder heads made of aluminum, and the SOHC valvetrain had 2 Valves per cylinder.

Versions 603.96x and 603.97x were turbocharged, and only turbocharged models of the 603 series were available to the U.S. market. The single camshaft and injection pump are driven by duplex chain from the crankshaft. A separate single row chain drives the oil pump. The camshaft operated the valves via hydraulic bucket tappets, with automatic valve clearance adjustment.

OM603 Version Statistics

OM602 Versions	kW Power	HP Power	CC
OM603.912	80	109	2996
OM603.913	80	109	2966
OM603.931	83	113	2966
OM603.960	100	136	2966
OM603.963	105	143	2966
OM603.971	100	136	3449
OM603.972	100	136	3449

Vehicle Applications

The 603 saw limited use in the W124, W126 and W140 series vehicles.