D2676 LOH — Euro 6c Overview
Complete technical overview of the MAN D2676 LOH 37 heavy-duty diesel engine. 12.42 L inline-6, 368 kW (500 PS), 2500 Nm. Covers common rail CP 3.4+, EDC17 control, VGT turbo, EGR/AGR, exhaust valve brake (EVB), and Euro 6c aftertreatment.
ENGINE OVERVIEW
Engine Identity
The MAN D2676 LOH 37 is a 12.42-litre inline 6-cylinder vertical diesel engine designed for heavy-duty bus and coach applications. It delivers 368 kW (500 PS) at 1800 rpm with a maximum torque of 2500 Nm across a wide plateau from 930 to 1350 rpm, providing excellent drivability for intercity and touring coaches.
Key Systems
Bosch high-pressure common rail injection. Rail pressure sensor, pressure limiting valve, 6 solenoid injectors.
Bosch EDC17, SW P700.6.9.2. 4 connectors. Controls injection, EGR, turbo, aftertreatment, EVB.
Variable geometry turbo with electronic actuator. Charge air cooler. Boost up to 2.2 bar.
Cooled EGR module with integrated cooler. Leak test at 3 bar, 30-min hold.
Exhaust valve brake with adjustable counter-holders. Clearance 0.60 mm cold.
DOC + DPF + SCR. Euro 6c compliant. AdBlue/DEF dosing system.
ENGINE SPECIFICATIONS
| PARAMETER | SPECIFICATION | NOTES |
|---|---|---|
| Engine Family | D26 Series | 12-litre class |
| Engine Type | D2676 LOH 37 | LOH = Low-emission Horizontal |
| Cylinders | 6 / Vertical In-Line | 4 valves per cylinder |
| Displacement | 12.42 L | Bore 126 mm × Stroke 166 mm |
| Compression Ratio | 18 : 1 | Direct injection |
| Rated Power | 368 kW (500 PS) | @ 1800 rpm (ISO 1585) |
| Max Torque | 2500 Nm | @ 930–1350 rpm (wide plateau) |
| Idle Speed | 600 rpm | Governed |
| Firing Order | 1-5-3-6-2-4 | Same as Cummins X11 |
| Injection System | Common Rail CP 3.4+ | Bosch high-pressure pump |
| EDC Controller | EDC17 (Bosch) | SW: P700.6.9.2 |
| Starter Motor | 5.5 kW / 24 V | Inertia-drive sliding-gear |
| Emission Standard | Euro 6c | DOC + DPF + SCR |
| Oil Capacity | 42 L (with filter) | 40 L without filter, 6 L top-up |
| Valve Clearance (Inlet) | 0.50 mm | Engine below 50°C |
| Valve Clearance (Exhaust) | 0.80 mm | Engine below 50°C |
| Valve Clearance (EVB) | 0.60 mm | Engine below 50°C |
| Datasheet Number | 51.99436-2316 | MAN official |
COMMON RAIL FUEL SYSTEM
VGT TURBOCHARGER
Variable Geometry
Adjustable vane nozzle ring controls exhaust flow to turbine wheel for optimal boost across RPM range
Up to 2.2 bar
Charge air cooler reduces intake temperature for improved volumetric efficiency
EDC17-Controlled
Electronic actuator commanded by EDC17 based on load, speed, altitude, and EGR demand
EGR / AGR SYSTEM
Integrated EGR + Cooler
Combined module with EGR valve and exhaust gas cooler in single assembly
3 bar / 30 min
Test coolant side and exhaust gas side separately at 3 bar for 30 minutes
EDC17-Controlled
EGR rate modulated by EDC17 to balance NOx reduction with combustion efficiency
EVB EXHAUST VALVE BRAKE
Exhaust Valve Brake
The EVB opens the exhaust valves slightly during the compression stroke, converting the engine into a compression brake. This provides significant retarding force for downhill driving without using service brakes.
EVB Clearance: 0.60 mm
Counter-holder lock nut: M14×1-8.8, torque 45 Nm. Adjust with engine below 50°C. Use feeler gauge 08.75310-3309. Check after every valve clearance adjustment.
SYSTEM ARCHITECTURE
SERVICE DATA
Torque Specifications
Special Tools
Always use MAN-specified special tools for valve clearance adjustment. Generic tools may damage valve bridges or EVB counter-holders.
QUICK REFERENCE TABLE
| PARAMETER | EXPECTED VALUE | FAULT INDICATION |
|---|---|---|
| Engine Type | D2676 LOH 37 | N/A |
| Displacement | 12.42 L | N/A |
| Configuration | Inline 6-cylinder, vertical | N/A |
| Bore / Stroke | 126 mm / 166 mm | N/A |
| Compression Ratio | 18:1 | N/A |
| Rated Power | 368 kW (500 PS) @ 1800 rpm | < 350 kW |
| Max Torque | 2500 Nm @ 930–1350 rpm | < 2300 Nm |
| Idle Speed | 600 rpm | Unstable / hunting |
| Firing Order | 1-5-3-6-2-4 | N/A |
| Valve Clearance — Inlet | 0.50 mm (cold) | > 0.60 mm |
| Valve Clearance — Exhaust | 0.80 mm (cold) | > 0.90 mm |
| Valve Clearance — EVB | 0.60 mm (cold) | > 0.70 mm |
| Injection System | Common Rail CP 3.4+ | Low rail pressure |
| EDC Controller | EDC17 (Bosch) | No communication |
| EDC Software | P700.6.9.2 | Outdated version |
| Starter Motor | 5.5 kW / 24 V | Slow cranking |
| Emission Standard | Euro 6c | N/A |
| Oil Capacity (with filter) | 42.0 L | N/A |
| Oil Capacity (without filter) | 40.0 L | N/A |
| Datasheet Number | 51.99436-2316 | N/A |
Valve adjustment, EDC removal, rail sensor replacement
Oil, gearbox, steering, axle, and A/C refrigerant data