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Mercedes OM400 specs and bolt torques



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Basic specs are open to everyone and include images, displacement, dimensions and weight, essential bolt tightening torques, the characteristics of the engine like its power and torque.
Essential bolt tightening torques are the main bearing cap bolt torque, the connecting rod cap bolt torque and the cylinder head bolt torques.


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Mercedes OM400 engine specs & key bolt torques

Essential Bolt torques

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

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

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

Key Specs

Mercedes OM400 engines

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

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

Mercedes OM400 engines

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 


Mercedes OM400 engines

Weight:
approx:
OM401 - 700 Kg
OM401LA - 760 Kg

OM402 - 815 Kg 
OM402LA - 875 Kg

OM403 - 965 Kg 

OM404 - 1115 Kg
OM404LA - 1200 Kg

Compression ratio:
Natural Aspiration 17.2:1
Mercedes OM400 engines

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 

Mercedes OM400 engines

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 


firing orders om400 engines
Firing orders for the om400 engines



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