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

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

Mercedes OM602 OM603 Engine ManualDiesel 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


Download: Mercedes Benz OM603 Engine Service Manual

Mercedes M104 M119 M120 OM603 Engines ManualMulti 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

Mercedes Turbodiesel Diesel Injection System ManualTurbocharged 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.

Mercedes-Benz OM603 Motor

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.

Series + Model Year Engine Version Power in kW (hp) Torque in Nm
W124 300 D 04/1985
06/1993
.912 81 (109) @ 4600 rpm 185 @ 2800 rpm
W124 300 D 1988+- .912 84 (113) @ 4600 rpm 191 @ 2800-3050
W124 300D Turbo 01/1987
03/1996
.960 &
.963 (4Matic)
106 (143) @ 4600 rpm 267 @ 2400 rpm
W124 300D Turbo 1988+- .960 &
.963 (4Matic)
108 (147) @ 4600 rpm 273 @ 2400 rpm
W124 300TD Turbo 1987- .960 106 (143) @ 4600 rpm 267 @ 2400 rpm
W124 300TD Turbo 1988+ .960 108 (147) @ 4600 rpm 273 @ 2400 rpm
W126 300SDL 02/1985
09/1987
.961 110 (148) @ 4600 rpm 273 @ 2400 rpm
W126 350SD/SDL 06/1990
08/1991
.97x 100 (136) @ 4000 rpm 310 @ 2000 rpm
W140 300SD / S350 09/1991
08/1996
.97x 111 (150) @ 4000 rpm 310 @ 2000 rpm
Mercedes-Benz OM603 Engine