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4BY2-180 Marine

Yanmar 4BY2-180 · 4BY2 family: specifications, its industrial/tractor base engine, cross-referenced parts and where to buy them.

Marinized BMW N47 2.0 L (common-rail)

The 4BY2 is the marine version of the BMW N47D20 — the 2.0 L inline-4 common-rail diesel fitted to the E90 320d, 520d, X3 20d and many others. Under a 2005 BMW–Yanmar agreement, BMW supplied the base engine; Yanmar added the raw-water cooling circuit, heat exchangers, exhaust manifold, marine ECU and gearbox coupling. Internal wear parts (oil filter element, fuel filter, timing components) cross to BMW N47 part numbers and are widely available at a fraction of the Yanmar price. Marine-specific externals — raw-water pump, manifolds, couplings — are Yanmar-only.

🚜 Base engine confirmed

The Yanmar 4BY2-180 is a marinized BMW N47D20 2.0 L common-rail diesel. Internals cross to BMW N47; marinized externals are Yanmar-only. No BMW donor BOM loaded yet. source

180 hp132.4 kW
1995 ccdisplacement
84×90 mmbore × stroke
4-cylcylinders
2008–2014year range (approx)
Turbo + ICaspiration

common-rail turbo+IC

📋 Full specifications 🚜 Industrial / tractor base 🔧 Aftermarket 17
Cheaper-part coverage · 4/8
🚜 Base engine ✓🌀 Impeller ✓💧 Raw-water pump🛢️ Oil filter ✓⛽ Fuel filter🌡️ Thermostat➰ Belt⚓ Anode ✓

A ✓ means at least one cheaper channel — aftermarket, the tractor/industrial base engine, or a standard component — exists for this engine in that category.

Parts by section · 52 assemblies

The exploded parts diagrams for the 4BY2-180, grouped by system. Open a figure for its callout part numbers and per-variant quantities.

Belts & pulleys

Fig 17 — V-BELT

Bilge & accessory pumps

Fig 30 — BILGE PUMP(OPTION)

Camshaft & timing gears

Fig 2 — LOWER TIMING CASEFig 15 — TIMING CHAIN LOWER P/DAMPERFig 16 — CAMSHAFT & TIMING GEAR CHAIN

Cooling – fresh water

Fig 26 — HEAT EXCHANGERFig 27 — HEAT EXCHANGER(INNER PARTS)

Cooling – sea water

Fig 25 — COOLING PUMP(SEA WATER)Fig 47 — COOLING SEA WATER PIPE & COUPLING(ZT SPEC)Fig 48 — COOLING SEA WATER PIPE & EXHAUST BEND(OPTION)

Crankshaft & flywheel

Fig 3 — FLYWHEEL HOUSINGFig 12 — CRANKSHAFTFig 13 — FLYWHEEL & CYLINDER MOUNTING PARTS

Cylinder block

Fig 1 — CYLINDER BLOCK

Cylinder head & valves

Fig 7 — CYLINDER HEAD/VALVE TRAIN-CAMSHAFTFig 9 — CYLINDER HEAD COVERFig 43 — TOP COVER & V-BELT COVERFig 49 — VALVE(OIL STOP)(OPTION)

Electrical & instruments

Fig 8 — CYLINDER HEAD ATTACHED/GLOW PLUGFig 37 — STARTING MOTORFig 38 — ALTERNATORFig 39 — WIRE HARNESS(ECU)Fig 40 — WIRE HARNESSFig 42 — ECUFig 46 — VDO GAUGE(OPTION)

Fuel injectors & nozzles

Fig 35 — HIGH-PRESSURE PUMP/INJECTOR

Fuel lines, tank & filter

Fig 33 — FUEL OIL FILTERFig 34 — PUMP, FUEL LOWFig 36 — FUEL FILTERFig 45 — FUEL FILTER(OPTION)

Intake and Exhaust

Fig 10 — INTAKE MANIFOLDFig 11 — TURBOCHARGER & AIR FILTERFig 21 — LUB. OIL PIPE(TURBINE)Fig 22 — AIR COOLERFig 23 — AIR COOLER(INNER PARTS)Fig 29 — MIXING ELBOWFig 41 — AIR HEATERFig 44 — MIXING ELBOW HIGH RISER(OPTION)Fig 50 — (11A)AIR FILTER (OPTION)

Lubricating

Fig 4 — OIL PAN/LUB. OIL SUMPFig 18 — LUB. OIL PUMPFig 19 — LUB. OIL FILTERFig 31 — STEERING OIL COOLER

Mounting

Fig 5 — ENGINE BRACKET

Other / general

Fig 20 — ROTARY PUMP(OPTION)Fig 24 — WATER PUMPFig 28 — HOSE, FW PUMP

Pistons, rods & liners

Fig 14 — PISTON & CONNECTING RODFig 32 — STEERING PUMP/PIPE

Tools & labels

Fig 6 — LABELFig 52 — TOOL

Transmission & drive

Fig 51 — (42A)ECU EXTENSION HARNES KIT(OPTION)
📚 Manuals & Sources
Specs— none yet
Operator's Manual— none yet
Service / Workshop Manual— none yet
Parts Catalog / List— none yet
More📖 Boat Inboard Engine Manuals Boat Manuals

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Category
Marine
Engine family
4BY2
Year range (approx)
2008–2014
Cylinders
4
Rated output
180 hp (132.4 kW)
Bore × stroke
84 × 90 mm
Displacement
1995 cc
Max rpm
4000
Continuous rpm
3876
Aspiration
Turbocharged + intercooled

Related 4BY2 engines

4BY2-1504BY2-150Z4BY2-180Z