The 422 is susceptible to cylinder liner cavitation. The workshop manual contains the specs for liner protrusion above the block deck. This is critical. If the liner sits too low, the head gasket fails. Too high, it cracks the cylinder head. The manual tells you exactly how to measure this with a dial indicator.
Search for the part number 6010 4501 01 . This is the correct diesel engine workshop manual for the OM422 series. Cross-reference any offer you find with that number.
The Mercedes-Benz OM422 is a heavy-duty, naturally aspirated or turbocharged V8 diesel engine. It belongs to the legendary 400 series family. This engine powers commercial trucks, buses, marine vessels, and industrial equipment. Keeping this power plant running requires precise technical data.
This comprehensive workshop guide provides the critical data and step-by-step procedures necessary to overhaul, service, and troubleshoot the OM422 engine family, including the naturally aspirated, turbocharged (A), and intercooled (LA) variants. 1. Engine Specifications & Identifiers om422 engine workshop manual
Launched in 1979, the OM422 was initially derived from the earlier OM402 engine found in models like the 1626S. By increasing the cylinder bore from 125 mm to 128 mm and the stroke from 130 mm to 142 mm, Mercedes created a robust 14.6-liter workhorse. The naturally aspirated OM422 was groundbreaking, shifting its torque peak down to just 1,200 rpm, giving drivers incredible flexibility without needing to constantly downshift on inclines.
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Essential bolt torque sequences, such as cylinder head bolts (5-step process) and connecting rod bolts ( The 422 is susceptible to cylinder liner cavitation
The versatility of the OM422 made it a favorite across multiple industries. You will primarily find this engine in:
Check for cavitation, scoring, or a distinct wear lip at the top of the piston travel.
Replace the twin element cartridges at every oil change interval (250 operating hours or 15,000 km). 5. Troubleshooting Common OM422 Issues Issue 1: Hard Starting or Failure to Start Cause: Air in the fuel system or failed lift pump. If the liner sits too low, the head gasket fails
The OM422 family includes several variants with distinct performance profiles:
This comprehensive workshop guide compiles critical specifications, maintenance procedures, and troubleshooting steps from the official factory service manual. 1. Engine Specifications & Technical Data Specification 90° V8 Diesel Displacement 14.6 Liters (14,618 cc) Bore x Stroke 128 mm x 142 mm Aspiration
Heavy commercial diesel engines rely on elastic stretch bolts. Always clean threads, lubricate bolt shoulders, and inspect stretch bolts for necking before installation. Replace any bolts that exceed maximum length parameters. Critical Torque Values Stage 1: 100 Nm Stage 2: 200 Nm Stage 3: 300 Nm Stage 4: Angle turn of 90° Stage 5: Angle turn of 90° Connecting Rod Bearing Cap Bolts: 100 Nm + 90° angle turn Main Bearing Cap Bolts: 300 Nm + 90° angle turn Flywheel Mounting Bolts: 200 Nm + 90° angle turn Crankshaft Vibration Damper Bolt: 450 Nm 5. Fuel Injection System & Timing