Volvo D12D User Manual

Service Information
Document Title: Function Group: Information Type: Date:
Engine, description 200 Service Information 2014/8/27
Profile:
ART, A35E, A35E FS [GB]
Engine, description
D12D is a straight six-cylinder, four-stroke, turbocharged diesel engine with direct injection and intercooler, as well as wet,
replaceable cylinder liners. The engine is equipped to meet governing legislation according to Tier 3/stage IIIA for exhaust
emissions.
D12D uses V-ACT (Volvo Advanced Combustion Technology) and gas split inspection, optimized air handling, and
turbocharger with wastegate. Electronically controlled IEGR (Internal Exhaust Gas Recirculation) lowers the content of NOX
and reduces emissions without aftertreatment of exhausts. All electronic functions in the engine are controlled by Volvo's
engine management system EMS2.
Cylinders are numbered in sequence beginning farthest from at the flywheel. Firing order: 1-5-3-6-2-4. The engine's
rotational direction is counter-clockwise seen from the flywheel.
Figure 1
Cylinder orientation
Engine identification
Identification plate 1
Engine designation, serial number, part number and assembly plant are stamped in one field on the engine block's left rear
edge
Identification plate 2
A decal with the software's ID-number, the engine's serial number and assembly plant is located on the valve cover to
ensure installation of correct ECU on the engine in production. On the back of the ECU, there is a decal indicating its
hardware number.
Assembly plants:
A = Skövde, Sweden
E = Curitiba, Brazil
F = Flen, Sweden
L = Lyon, France
Identification plate 3
The certification decal is located on the valve cover as well as on the machine frame.

Volvo D12D Specifications

General

Engine Model	D12D
Displacement	12.1 liters
Bore	131 mm
Stroke	150 mm
Compression Ratio	17.5:1
Fuel Type	Diesel
Engine Type	Diesel
Configuration	Inline
Aspiration	Turbocharged
Torque	2200 Nm
Cooling System	Liquid-cooled

Summary

Engine Description

Engine Identification Plates

Details on identification plates 1, 2, and 3 for engine identification and assembly plant information.

Cylinder Orientation

Illustrates the cylinder numbering and firing order of the D12D engine.

Engine Protection System

Function Description and Activation

Explains the engine control unit's protective functions and the parameters that activate them.

Protective Actions and Limitations

Details warnings, reduced torque, and specific limitations for EGR-system and flywheel sensor.

Parameter Monitoring Details

Covers oil pressure, coolant temperature, crankcase pressure, and water in fuel monitoring.

E-ECU Replacement

Changing Pre-programmed ECU

Details the steps using VCADS Pro to program a new pre-programmed ECU, including saving parameters.

Changing Non-programmed ECU

Outlines the process for replacing a non-programmed ECU using VCADS Pro, including removal and installation steps.

Engine Compression Test

Preparation and Tools

Lists necessary tools and preliminary steps for the compression test.

Dismantling Procedure

Detailed steps for disassembling engine components to access cylinders for the test.

Compression Measurement

Instructions on connecting the gauge, running the engine, and interpreting compression readings.

Reassembly Procedure

Steps for reassembling the engine after the compression test, including torques and adjustments.

Engine and Transmission Removal

Preparation and Safety

Covers initial steps like positioning the machine, disconnecting power, and safety warnings for control units.

Component Removal

Details the process of removing underbody skid plates, cross members, radiator, and belts.