Mercedes-Benz OM639 engine

The OM639 is a turbocharged inline-three diesel engine produced by Mercedes-Benz, in collaboration with Mitsubishi Motors.[1]

Mercedes-Benz OM639
Overview
ManufacturerMercedes-Benz
Production2004–2009
Layout
ConfigurationStraight-three engine
Displacement1.5 L (1,493 cc)
Cylinder bore83 mm (3.27 in)
Piston stroke92 mm (3.62 in)
Block materialAluminium alloy
Head materialAluminium alloy
ValvetrainDOHC
Compression ratio18.0:1
Combustion
TurbochargerSingle-turbo
Fuel systemDirect injection Common rail
Fuel typeDiesel
Cooling systemWater cooled
Output
Power output50–70 kW (68–95 PS; 67–94 hp)
Torque output160–210 N⋅m (118–155 lb⋅ft)

Design

The OM639 is based on the four-cylinder OM640 engine and features a dual mass flywheel, exhaust gas recirculation, and Euro 4 emission standard compliance.[2] It is transversely mounted behind the front axle and inclined 60 degrees due to the sandwich floor design used in the Smart and Mitsubishi models,[3] so the engine slides underneath the floorpan instead of into the cabin in the event of a head-on collision to improve safety.[4]

Models
Engine Power Torque Years
OM639
DE15 LA R		 50 kW (68 PS; 67 hp)
@ 4,000 rpm		 160 N⋅m (118 lb⋅ft)
@ 1,600 rpm		 2004–2009
OM639
DE15 LA		 70 kW (95 PS; 94 hp)
@ 4,000 rpm		 210 N⋅m (155 lb⋅ft)
@ 1,800 rpm

OM639 DE15 LA R

OM639 DE15 LA

Reception

Due to the relatively low sales of the cars the engine was placed in to (compared to the class leaders), the engine is in a niche between owners.

At the time, the 70 kW version was the world's most powerful three-cylinder passenger car diesel engine.[2] Despite this, it was only used in the Smart Forfour (until discontinuation) and the Mitsubishi Colt (until its facelift in 2008, citing lack of demand[9]). Today, the most powerful three-cylinder passenger car diesel engine is the BMW B37, which achieves 116 hp.

The engine is reliable, with no common issues or widespread issues noted by owners, and no recalls issued.[10]

Lastly, real world MPG is very close to Mitsubishi's numbers out on the road, with it getting over 90% of its rated official MPG of 58.9 rated by owners of the vehicles.[11]

References
  1. Butler, Glenn (2004-10-01). "Smart ForFour (2004-) - motoring.com.au". motoring.com.au. Retrieved 2018-07-17.
  2. "Om639 Engine | Internal Combustion Engine | Diesel Engine". Scribd. Retrieved 2018-07-17.
  3. "2007 Smart Fortwo @ Top Speed". Top Speed. Retrieved 2018-07-17.
  4. "Mercedes cuts sandwich but B-class still tempts appetite". The National Business Review. 2012-04-14. Retrieved 2018-07-17.
  5. "Smart Forfour (2004 - 2007) used car review | Car review | RAC Drive". www.rac.co.uk. Retrieved 2018-07-17.
  6. "Smart Forfour 1.5 Brabus review | Autocar". www.autocar.co.uk. Retrieved 2018-07-17.
  7. "2006 Smart Forfour @ Top Speed". Top Speed. Retrieved 2018-07-17.
  8. "Mitsubishi Colt 1.5 Di-D review | Autocar". www.autocar.co.uk. Retrieved 2018-07-17.
  9. "Used Mitsubishi Colt Hatchback (2004 - 2013) Engines | Parkers". www.parkers.co.uk. Retrieved 2020-08-24.
  10. "Mitsubishi Colt Recall List". www.vehicle-recall.co.uk. Retrieved 2020-08-24.
  11. "Mitsubishi Colt (2004 - 2008) 1.5 DI-D - Real MPG | Honest John". www.honestjohn.co.uk. Retrieved 2020-08-24.
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