Mercedes Benz OM421, OM422, OM423 Engine Workshop Manual

(1 customer review)

Original price was: $34.99.Current price is: $24.99.


  • Covers Mercedes Benz OM421, OM422, OM423 engine models listed
    • 421.905, 421.906, 421.907, 421.910
    • 422.905, 422.906, 422.907, 422.909, 422.911, 422.912, 422.913, 422.914, 422.915, 422.918, 422.919, 422.920, 422.950, 422.952, 422.953, 422.954, 422.955, 422.956, 422.957, 422.958, 422.959
    • 423.905, 423.906, 423.907, 423.908, 423.950,
  • 256 pages
  • Instant PDF Download
  • Linked table of contents, searchable, printable
  • Compatible with Windows/Mac/Tablet

This manual covers service and overhaul of the Mercedes Benz OM421, OM422, OM423 diesel engine. It includes detailed specs, illustrations and service procedures to guide the mechanic with correctly repairing the diesel engine to the manufacturer’s specifications. This downloadable engine service manual is also known as the repair manual or workshop manual.

PDF Contents:

Installation overview
Illustrations, Sectional views
Special tools
Technical data, Tightening torques
Reconditioning tapped holes with Heli-coil inserts

Exploded views
Removing and installing cylinder head cover
Removing cylinder head
Installing cylinder head
Machining cylinder head
Removing and installing oil separator
Sealing timing case cover
Renewing shaft seal at front of housing cover
Removing and installing timing case
Renewing shaft seal in timing case
Removing and installing oil sump
Measuring projection of cylinder liner
Removing and installing, sealing cylinder liner
Making second annular groove in cylinder liner
Machining seat of collar in crankcase
Eliminating signs of corrosion on plane face of crankcase

Exploded views
Renewing guide bearing in flywheel
Removing and installing flywheel
Machining flywheel
Renewing starter ring gear
Removing and installing vibration damper or hub
Renewing race on the crankshaft
Renewing race on the flywheel
Removing pistons
Installing pistons
Renewing piston rings
Renewing bearings of conrod
Removing, renewing bearings of, and installing crankshaft
Grinding crankshaft

Exploded views
Testing compression pressure
Adjusting valve clearance
Renewing rocker arms
Renewing valve springs
Installing valve stem seals
Removing and installing valves
Machining valve seats
Grinding valves
Removing and installing valve guides
Renewing valve seat rings
Testing timing by means of valve stroke
Removing and installing camshaft
Checking valve stroke
Renewing camshaft bearings
Checking end play of camshaft
Amendment note

Injection pumps Installation overview
Exploded views
Bleeding fuel system
Testing start of delivery
Removing and installing injection pump
Removing and installing injection nozzle with nozzle holder
Testing injection nozzle
Disassembling, cleaning and assembling nozzle holder and injection nozzle

Exploded views, Sectional views
Renewing fuel filter
Removing and installing turbocharger
Testing turbocharger
Disassembling and reassembling turbocharger

Disassembling and reassembling air compressor
Renewing V-belt

Removing and installing intake manifold
Removing and installing exhaust manifold
Checking exhaust brake setting
Adjusting exhaust brake

Removing and installing starter
Removing and installing alternator

Measuring oil consumption/Oil consumption test sheet
Removing and installing oil cooler
Disassembling and reassembling oil cooler
Removing and installing oil filter element
Removing and installing pressure relief valve on oil pump
Removing and installing oil filter bypass valve
Removing and installing oil pumps
Disassembling and reassembling oil pumps
Removing and installing oil spray nozzle
Renewing oil pressure sensor

Removing and installing coolant regulator
Testing coolant regulator
Removing grease and lime from coolant system
Disassembling and reassembling coolant pump

Testing road speed and engine speed limiter
Amendment note

1 review for Mercedes Benz OM421, OM422, OM423 Engine Workshop Manual

  1. Harry DeLabolva

    Great! Factory book in PDF. Just what I needed. Thanks.

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