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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

 

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




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email: steve@barringtondieselclub.co.za
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Page Revision #12.1RS 14-08-2021