Mercedes OM401 OM402 OM403 OM404 engine manuals and specifications

Diesel Engine manuals and specifications at Barrington Diesel Club

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Workshop manuals, specs and bolt torques for OM400 engines

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Mercedes Diesel Engine OM401 OM402 OM441 OM444 Manuals

OM401 Parts Book, 39 pages, Click to download

OM401 OM402LA Workshop manual,365 pages, Click to download

OM401 OM402 OM441 OM444 Operator manual,83 pages, Click to download

Mercedes OM400 Essential Diesel Engine Bolt Tightening Torques

OM400 engines Mercedes Main Bearing capscrews
Step 1 = 100 Nm
Step 2 = 200 Nm
Step 3 = 300 Nm
Step 4 = + 90 degrees
Step 5 = + 10 degrees

OM400 engines Mercedes Connecting Rod Bolts
Step 1 = 45 Nm
Step 2 = 100 Nm
Step 3 = + 90 degrees
Step 4 = + 10 degrees

OM400 engines Mercedes Cylinder Head Bolts
Step 1 = 10 Nm
Step 2 = 50 Nm
Step 3 = 100 Nm
Step 4 = 140 Nm
Step 5 = +90 degrees
Step 6 = +10 degrees

OM400 series Diesel Engine firing orders

Firing orders for the om400 engines
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Mercedes Designations German - English
A = Turbocharger = T
L = Intercooler = I
OM = Diesel engine = ADE

example:
OM366 = ADE366N
OM366A = ADE366T
OM366LA = ADE366TI
OM442LA = ADE442TI

Mercedes OM401 OM402 OM403 OM404 Diesel Engine Specs

Displacement
OM401 - 9.57 liter, 584 CID
OM402 - 12.76 liter, 779 CID
OM403 - 15.95 liter, 973 CID
OM404 - 19.12 liter, 1168 CID

Bore
125 mm, 4.92 in
Stroke
130 mm, 5.12 in

Compression ratio
Natural Aspiration 17.2:1

Arrangement
OM401 - 6v Natural Aspiration
OM401LA - 6v Turbo Aftercooled

OM402 - 8v Natural Aspiration
OM402LA - 8v Turbo Aftercooled

OM403 - 10v Natural Aspiration
OM404 - 12v Natural Aspiration
OM404LA - 12v Turbo Aftercooled

Weight (approx)
OM401 - 700 Kg
OM401LA - 760 Kg
OM402 - 815 Kg
OM402LA - 875 Kg
OM403 - 965 Kg
OM404 - 1115 Kg
OM404LA - 1200 Kg

Power
OM401 - 189 hp, 141 kW @ 2500 rpm
OM401LA - 296 hp, 221 kW @ 2500 rpm
OM402 - 252 hp, 188 kW @ 2500 rpm
OM402LA - 295 hp, 220 kW @ 2500 rpm
OM403 - 315 hp, 235 kW @ 2500 rpm
OM404 - 378 hp, 282 kW @ 2500 rpm
OM404LA - 443 hp, 330 kW @ 2500 rpm

Torque
OM401 - 462 lb.ft, 627 Nm @ 1300 rpm
OM401LA - 540 lb.ft, 734 Nm @ 1300 rpm
OM402 - 616 lb.ft, 836 Nm @ 1300 rpm
OM402LA - 721 lb.ft, 978 Nm @ 1300 rpm
OM403 - 760 lb.ft, 1030 Nm @ 1500 rpm
OM404 - 912 lb.ft, 1236 Nm @ 1300 rpm
OM404LA - 1247 lb.ft, 1690 Nm @ 1300 rpm