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4BY150 Marine

Yanmar 4BY150 · 4BY family: specifications, its industrial/tractor base engine, cross-referenced parts and where to buy them.

Marinized BMW N47 2.0 L (common-rail)

The 4BY 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 4BY150 is a marinized BMW N47D20 2.0 L common-rail diesel (BMW–Yanmar supply agreement). Internal wear parts cross to BMW N47 numbers; marinized externals (raw-water circuit, manifolds, couplings) are Yanmar-only. This site's 4BY marine parts book covers the Yanmar-side BOM; no BMW donor BOM is loaded yet. source

150 hp110.3 kW
1995 ccdisplacement
84×90 mmbore × stroke
4-cylcylinders
2008–2011year range (approx)
Turbo + ICaspiration

common-rail turbo+IC; cont 136mhp@3876

📋 Full specifications 9 🚜 Industrial / tractor base 🔧 Aftermarket 12
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 · 43 assemblies

The exploded parts diagrams for the 4BY150, 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 CASE/BELT W PUMPFig 15 — TIMING CHAIN LOWER P/DAMPERFig 16 — TIMING GEAR TIMING CHAIN TOP

Cooling – fresh water

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

Cooling – sea water

Fig 25 — COOLING SEA WATER PUMP

Crankshaft & flywheel

Fig 3 — FLYWHEEL HOUSINGFig 13 — FLYWHEEL & CYL.MOUNTING PARTS

Cylinder block

Fig 1 — CYLINDER BLOCK

Cylinder head & valves

Fig 7 — CYL.HEAD/VALVE TRAIN-CAMSHAFTFig 9 — CYLINDER HEAD COVERFig 43 — TOP COVER

Electrical & instruments

Fig 8 — CYL.HEAD ATTACHED/GLOW PLUGFig 37 — STARTERFig 38 — ALTERNATORFig 39 — WIRE HARNESS(ECU)Fig 40 — WIRE HARNESSFig 42 — ECU

Fuel injectors & nozzles

Fig 35 — HIGH-PRESSURE PUMP/INJECTOR

Fuel lines, tank & filter

Fig 33 — FUEL OIL FILTER/PIPEFig 34 — PUMP, FUEL LOWFig 36 — FUEL FILTER

Intake and Exhaust

Fig 10 — INTAKE MANIFOLDFig 11 — TURBOCHARGERFig 22 — AIR COOLERFig 23 — AIR COOLER(INNER PARTS)Fig 29 — MIXING ELBOWFig 41 — AIR HEATER(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 21 — PIPE, OILFig 24 — WATER PUMPFig 28 — HOSE, FW PUMP

Pistons, rods & liners

Fig 12 — CRANKSHAFT WITH BEARING SHELLSFig 14 — PISTON & CONNECTING RODFig 32 — STEERING PUMP/PIPE

Tools & labels

Fig 6 — LABEL
📚 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

External links — we host none of these documents.

4BY150 — Affiliate Parts Search

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Category
Marine
Engine family
4BY
Year range (approx)
2008–2011
Cylinders
4
Rated output
150 hp (110.3 kW)
Bore × stroke
84 × 90 mm
Displacement
1995 cc
Max rpm
4000
Continuous rpm
3876
Aspiration
Turbocharged + intercooled

Related 4BY engines

4BY150Z4BY1804BY180Z